Proteomics studies the proteome through several key areas: mass spectrometer based proteomics to identify and quantify expressed proteins; array based proteomics to define protein function, regulation, and interactions; informatics to define needed proteomic data; and clinical applications. Mass spectrometry involves separating the proteome using techniques like 2D gel electrophoresis or chromatography, then analyzing proteins/peptides by mass spectrometry to identify sequences and proteins present. This provides information on protein expression levels, functions, locations, and modifications in the cell.
This presentation contain the information about gel electrophoresis method , instruments & types.
Electrophoresis is a method through biological molecules are separated by applying an electric field.
Main purpose of this method is to determine the number , amount & mobility of biological component.
There are some internal & external factors that affects the process of electrophoresis.
The bio-molecules have charge on it & when we apply an electric field , the charge particles move to the opposite cathode. In this way, charge particles are separated
There are 3 types of gels that use in this process .
In this buffers are also used which provide ions that carry a current.
Scott Malcolm | Describe About Purpose and Creation Process of Gel Electropho...Scott Malcolm Dallas
Scott Malcolm is a great businessman, who lives in Dallas, Taxes. He explains here about biochemistry and molecular biology to separate a mixed population of DNA and RNA fragments by length and to estimate the size of DNA and RNA fragments.
Fatty acids (F.A.s) are taken up by cells.
They may serve as:
precursors in synthesis of other compounds
fuels for energy production
substrates for ketone body synthesis.
Ketone bodies may be exported to other tissues: used for energy production.
Some cells synthesize fatty acids for storage or export.
Fats are an important source of calories.
Typically 30-40% of calories in American diet are from fat.
Fat is the major form of energy storage.
Typical body fuel reserves are:
fat: 100,000 kcal.
protein: 25,000 kcal.
carbohydrate: 650 kcal
This presentation contain the information about gel electrophoresis method , instruments & types.
Electrophoresis is a method through biological molecules are separated by applying an electric field.
Main purpose of this method is to determine the number , amount & mobility of biological component.
There are some internal & external factors that affects the process of electrophoresis.
The bio-molecules have charge on it & when we apply an electric field , the charge particles move to the opposite cathode. In this way, charge particles are separated
There are 3 types of gels that use in this process .
In this buffers are also used which provide ions that carry a current.
Scott Malcolm | Describe About Purpose and Creation Process of Gel Electropho...Scott Malcolm Dallas
Scott Malcolm is a great businessman, who lives in Dallas, Taxes. He explains here about biochemistry and molecular biology to separate a mixed population of DNA and RNA fragments by length and to estimate the size of DNA and RNA fragments.
Fatty acids (F.A.s) are taken up by cells.
They may serve as:
precursors in synthesis of other compounds
fuels for energy production
substrates for ketone body synthesis.
Ketone bodies may be exported to other tissues: used for energy production.
Some cells synthesize fatty acids for storage or export.
Fats are an important source of calories.
Typically 30-40% of calories in American diet are from fat.
Fat is the major form of energy storage.
Typical body fuel reserves are:
fat: 100,000 kcal.
protein: 25,000 kcal.
carbohydrate: 650 kcal
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
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Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Unveiling the Energy Potential of Marshmallow Deposits.pdf
proteomics lecture 2b.ppt protein structure determination
1. Proteomics
• The proteome is larger than the genome due to
alternative splicing and protein modification.
As we have said before we need to know
• All protein-protein interactions.
• One protein or peptide may have multiple
functions depending on context.
• Regulation of protein function.
• Modification
• Location
• Detection and quantitation
– The concentration of all proteins changes by 10 orders of
magnitude within the cell. Currently there are no easy
methods for determining the concentrations over this
large of a concentration range.
2. What areas are being studied in Proteomics?
• Mass spectrometer based proteomics
– This area is most commonly associated with proteomics
and is a method to determine which proteins are
expressed and the amounts of those proteins.
• Array based proteomics
– This method uses various arrays to try and define the
function of the proteins, regulation levels and interacting
partners within the cell.
• Informatics
– This is trying to define what information will be needed,
stored, accessed and how it can be used to study the
proteome of the cell.
• Clinical
• Orthagonalomics
3. MASS SPECTROMETER BASED
PROTEOMICS
• Principles
– Mass spectrometry is based on the fact that ions
of differing charge and mass will move
differently in a magnetic field. In proteomics
the proteins are first separated by some means
and then analyzed with a mass spectrometer
4. Separating the Proteome
• The protein genome is separated by several
different methods.
• Many researchers are first separating
portions of the genome, such as isolating
organelles, and then analyzing that portion.
• This is because often proteins of interest,
regulatory proteins are in low abundance.
• The most commonly used method is 2-
dimensional gel electrophoresis.
– Consists of using isoelectric focusing with SDS
polyacrylamide gel electrophoresis
5. Isoelectric focusing
• This separates proteins based on isoelectric point
• The isoelectric point is the pH at which the protein has
no net charge.
• pH gradients may be large 2-10 or small 6-7
• Typically this is done with an immobilized pH
gradient gel strip or with a tube gel containing a low
concentration of polyacrylamide.
• Ampholytes are added to create a pH gradient in an
electric field and the proteins are loaded.
• The IEF gel is placed in an electrophoresis system for
up to 24 hours and the proteins form tight bands at
their isoelectric point.
• The IEFgels are now ready for the second method.
6. Figure is from “Principles of Biochemistry” Lehninger, Fourth Edition
7. SDS Polyacrylamide Gel Electrophoresis
• The second dimension separates the proteins based on size.
• There are two parts, the stacking gel which concentrates the
sample and the running gel that is used to separate the
proteins.
• The IEF gel is soaked in a solution containing chemical to
denature the proteins including sodium dodecyl sulfate a
detergent which gives the proteins a net negative charge.
This means that all proteins will move in one direction.
• The IEF gel is then put in the one long well in the stacking
gel, sealed in place with agarose, and the proteins subjected
to an electric field to separate.
• The larger proteins are found at the top and the smaller
ones are found at the bottom of the gel.
8. 2-Dimensional Gel Electrophoresis
• In a 2D gel the proteins appear as spots on the gel
rather than bands. These spots can then be
further processed or used for mass spectrometry
directly.
• Further processing usually includes spot excision,
trypsin digestion, and mass spectromety
• Analysis may also include differential 2D gel
electrophoresis
– In this case a control and sample are separately
labeled with a fluorescent molecule.
– The samples are mixed and electrophoresed in the
same gels.
– A laser scanner is used to identify each spot and a
program puts the two images together.
12. Alternate Separation Methods
• The first dimension is run in larger agarose tube
gels with ampholytes.
– This has less resolution than polyacrylamide gels.
The tubes are sliced and the proteins are allowed to
diffuse out.
• Gel regions are cut, proteins eluted and the
proteins are then separated by capillary
electrophoresis.
• Capillary electrophoresis has a much greater
resolution for the proteins mass.
• Proteins are eluted from the capillary in the
process and can be collected. They are readily
available for mass spectrometry.
13. Alternative Separation Methods
• Whole proteome is analyzed at once.
• Proteome is digested with protease (trypsin)
• Digested proteome is injected to HPLC with
2 columns in series (mixed bed ion exchange
and reverse phase)
• Peptides are eluted from ion exchange onto
reverse phase and then separated on reverse
phase column.
• Peptides then enter ESI-MS-MS
14. Mass Spectrometery
• Separates ions based on mass to charge ratio.
– Charges are placed on the protein or the peptide by
ionization.
• Two most common types of ionization are:
• Matrix-Assisted Laser Desorption Ionization.
– MALDI causes fragmentation of the protein during
ionization. Can be used to get more information
about the fragments. Easier to do than ESI.
• Electrospray ionization (ESI)
– ESI can give whole protein masses as well as complex
masses. If the proteins is first separated by reverse
phase HPLC before injection only the subunits masses
will be known.
15. Matrix-Assisted Laser Desorption
Ionization (MALDI)
• MALDI causes fragmentation of the protein
during ionization. Can be used to get more
information about the fragments. Easier to
do than ESI.
• Requires sample to be placed in matrix that
absorbs appropriate wavelength light.
• Matrix generates heat and forms ions of
matrix and what is around it.
17. Mass Analyzers
• Important parameters
– Sensitivity
• How few ions can be detected.
– Resolution
• How well different masses can be determined.
– mass accuracy
• How reproducible and correct are the masses.
18. Mass Analyzers (MS)
• Quadrapole
• High Sensitivity, acceptable mass accuracy and
resolution
• Easily coupled to chromatography
• Time of Flight
• High Sensitivity, high mass accuracy, high
resolution
• Limited to small m/z ratios
• Not easily coupled to chromatography
• Easily coupled to MALDI
19. Mass Analyzers (MS)
• Ion Trap
• High Sensitivity
• Low mass accuracy and resolution
• Fourier Transform ion cyclotron
• High sensitivity, mass accuracy, resolution,
dynamic range
• Expensive, difficult to operate, low fragmentation
efficiency
20. Mass Spectrometers
• Instruments are often coupled
– MS/MS
• ESI - quadrapole MS -TOF-MS
– Collider
• Is essentially a Quadrapole MS with collision
gas included
• Forms collision induced ions
– Gives collision induced spectra (CID)
23. Protein identification and Quatitation
• To quantitate
– add stable isotopes
– post separation modification
• SH, NH2, N-linked carbohydrates
• Incorporation of isotopes in culture
25. Protein Identification
• Use collision induced spectra
– provides sequence information
– provides unique m/z spectra for each peptide
• Problem is large number of CID & large
amount of information.
– Need methods for searching
– Filtering has been tried (limited success)
– Most successful with human intervention.
– Improving
• Use unique mass of peptides to identify
sequence and multiple ions to identify proteins
26. Amino Acid Masses
Amino acid Mass(avg) Amino acid Mass(avg)
G 57.0520 D 115.0886
A 71.0788 Q 128.1308
S 87.0782 K 128.1742
P 97.1167 E 129.1155
V 99.1326 M 131.1986
T 101.1051 H 137.1412
C 103.1448 F 147.1766
I 113.1595 R 156.1876
L 113.1595 Y 163.1760
N 114.1039 W 186.2133
27. Peptide Fragmentation
100
0
250 500 750 1000
m/z
%
Intensity
K
1166
L
1020
E
907
D
778
E
663
E
534
L
405
F
292
G
145
S
88 b ions
147
260
389
504
633
762
875
1022
1080
1166 y ions
28. Mass Analyzers (MS)
Quadrapole
• Sensitive, acceptable mass accuracy and resolution
• Easily coupled to chromatography.
– Time of Flight
• Sensitive, high mass accuracy, high resolution
• Limited to small m/z ratios
• Not easily coupled to chromatography
– Ion Trap
• Sensitive
• Low mass accuracy
– Fourier Transform ion cyclotron
• High sensitivity, mass accuracy, resolution, dynamic
range
• Expensive, difficult to operate, low fragmentation
efficiency
29.
30. Proteomics
• The proteome is larger than the genome due to alternative
splicing and protein modification.
As we have said before we need to know
• All protein-protein interactions.
• Function
– One protein or peptide may have multiple functions depending on
context.
• Regulation of protein function.
• Modification
• Location
– Location will help us to understand the proteins role in the cell,
what its function is, and what controls its function.
• Detection and quantitation
– The concentration of all proteins changes by 10 orders of
magnitude within the cell. Currently there are no easy methods for
determining the concentrations