Antigen processing and presentation by Dr K.Geetha, Associate Professor, Department of Biotechnology, Kamaraj College of Engineering & Technology, Near Virudhunagar, Madurai Dist.
IT CONTAINS THE LATEST INFORMATION ABOUT MHC MOLECULE WHICH WILL BE HELPFUL FOR B.SC /M.SC/CSIR-NET/DBT-JRF/GATE STUDENTS. THIS IS IN VERY SIMPLE AND LUCID MANNER TO UNDERSTAND AND ONE CAN EASILY OPT FOR THIS TO PREPARE NOTES.
Antigen processing and presentation by Dr K.Geetha, Associate Professor, Department of Biotechnology, Kamaraj College of Engineering & Technology, Near Virudhunagar, Madurai Dist.
IT CONTAINS THE LATEST INFORMATION ABOUT MHC MOLECULE WHICH WILL BE HELPFUL FOR B.SC /M.SC/CSIR-NET/DBT-JRF/GATE STUDENTS. THIS IS IN VERY SIMPLE AND LUCID MANNER TO UNDERSTAND AND ONE CAN EASILY OPT FOR THIS TO PREPARE NOTES.
Major Histocompatibility Complex (MHC) plays a cardinal role in T cell-mediated immunity. Modern immunogenetics largely depends on the research on the MHC complex.
This ppts file will give the students of biochemistry or biology, in general, a brief outlook on the structure and functions of MHC, as well as its mode of action.
I hope this work will help intermediate students grasping the topic.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
6. Group of complex genes
Situated on the short arm of chromosome 6
in humans.
These molecules are glycoproteins.
Play an important role in the regulation of
the adaptive immune response.
Autoimmune blistering disease provides an
ideal model for studying the role of MHC in
autoimmunity.
7. In humans, it contains more than 200 genes
The system is called H2 in mice ,( first
recognized in 1937 as a barrier to
transplantation in mice).
Called HLA (human lymphocyte antigen) in
humans,( first discovered through antigenic
differences between white blood cells from
different individuals).
8. Class I MHC contains three genes called HLA-
A, B, and C; proteins from these genes are
expressed on almost all cells.
Class II MHC genes are called HLA-DR, DQ,
and DP; their proteins are expressed on
antigen-presenting macrophages, dendritic
cells and B cells.
13. T cells recognize foreign antigens in the form
of short peptides that have been processed
and displayed on the cell surface bound to
MHC-I or MHC-II molecules.
Antigens are often categorized according to
whether they are derived from
(1) viruses, intracellular bacteria, or protozoan
parasites (endogenous pathogens); or
(2) exogenous pathogens that replicate outside of
the cell.
14.
15. Intracellular antigens are presented to T cells by any
nucleated cell because MHC-I expression is ubiquitous.
In contrast, exogenous antigens are taken up by
professional APCs, which process the antigens and present
them in the context of MHC-II.
16. Endogenous antigens, including misfolded
proteins and pathogen-derived peptides, are
processed by the proteasome.
This complex of proteases typically generates
peptides of four to twenty amino acids with
a hydrophobic carboxy terminus.
After trimming of the peptide by cytosolic
proteases, the antigenic peptides are translocated
to the endoplasmic reticulum by the transporters
associated with antigen processing (TAP1 and
TAP2 molecule).
Meanwhile, a new MHC-I molecule is being
synthesized in the endoplasmic reticulum.
17.
18. As it folds, it is bound by calnexin, which is
then replaced by calreticulin and b2
The new MHC-I molecule associates with the
MHC-I peptide loading complex.
19. Tapasin physically links the MHC-I molecules
and the TAP transporters. As the peptide
enters from the cytosol, the cleft of the class I
molecule receives it and the peptide-bound
MHC-I molecule dissociates from the peptide-
loading complex and is recruited to the cell
surface.
This complex machinery has several quality-
control steps, such that MHC-I molecules that
fail to assemble properly are degraded.
Ultimately, the peptide presented on MHC-I
molecule will stimulate a CD8 T cell response
20.
21.
22. Exogenous antigens
Exogenous antigens are processed quite differently.
Bacterial proteins are cleaved by proteases, cathepsins, and metalloproteases
in the acid environment of the endocytic pathway.
Meanwhile, MHC-II molecules assemble in the endoplasmic reticulum with
another molecule called the invariant chain (li). The newly synthesized
molecules transit the endoplasmic reticulum and the Golgi apparatus.
After passage of the li-loaded MHC-II-DM complex through the Golgi into the
late endosomes, the invariant chain is cleaved by acid proteases, leaving a
residual peptide referred to as the CLass II-associated Invariant chain Peptide
(CLIP) in the MHC-II cleft.
CLIP occludes the MHC-II cleft and prevents peptides from loading until the
molecule is in the lysosomal or late endosomal compartment containing the
peptides.
At that point, HLA-DM molecules remove CLIP from the cleft and stabilize the
molecule while the peptide is loaded into the cleft.
HLA-DO molecules can also facilitate this process in some settings.
The fully assembled and loaded MHC-II molecule is recruited to the surface and
serves to stimulate predominantly CD4 positive T cells (Figure 6B and Figure 7).