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METABOLIC
PROCESSES
CHARILYN D. DELA CRUZ
1
Introduction
2
• Metabolic processes – all chemical reactions that occur
in the body
There are two (2) types of metabolic reactions:
• Anabolism
• Larger molecules
are made from
smaller ones
• Requires energy
• Catabolism
• Larger molecules
are broken down into
smaller ones
• Releases energy
Anabolism 3
• Anabolism provides the materials needed for cellular
growth and repair
• Dehydration synthesis
• Type of anabolic process
• Used to make polysaccharides, triglycerides, and proteins
• Produces water
CH2OH
H
H
OH
O
H OH
Monosaccharide +
HHO
H
OH
H
H
OH
O
H OH
Monosaccharide
HHO
H
OH
H
H
OH
O
H OH
Disaccharide
H2O
Water+
HHO
H H
H
OH
O
H OH
HO
H
OH
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
CH2OH CH2OH CH2OH
Amino acid
N
H
H
C C
H
R
Dipeptide molecule ++
Peptide
bond
Amino acid
N
H
H
C C
H
H
H
R
H
O
N
H
H
C C
H
R
H
O
N
H
C C OH
R
H
O
O
N
H
H
C C
H
R
N
H
C C OH
R
H
O
O
Water
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
O O
H2O
Anabolism
4
H C
H
Glycerol 3 fatty acid molecules+
OH HO
H C OH HO
H C
C
C
COH HO
H
O
O
C
C
C
O
O
O
H C
H
Fat molecule (triglyceride) +
H C
H C O
O
O
H
3 water
molecules
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
H2O
H2O
H2O
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
O
Catabolism 5
• Catabolism breaks down larger molecules into smaller ones
• Hydrolysis
• A catabolic process
• Used to decompose carbohydrates, lipids, and proteins
• Water is used to split the substances
• Reverse of dehydration synthesis
CH2OH
H
H
OH
O
H OH
Monosaccharide +
HHO
H
OH
H
H
OH
O
H OH
Monosaccharide
HHO
H
OH
H
H
OH
O
H OH
Disaccharide
H2O
Water+
HHO
H H
H
OH
O
H OH
HO
H
OH
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
CH2OH CH2OH CH2OH
Catabolism 6
Amino acid
N
H
H
C C
H
R
Dipeptide molecule ++
Peptide
bond
Amino acid
N
H
H
C C
H
H
H
R
H
O
N
H
H
C C
H
R
H
O
N
H
C C OH
R
H
O
O
N
H
H
C C
H
R
N
H
C C OH
R
H
O
O
Water
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
O O
H2O
H C
H
Glycerol 3 fatty acid molecules+
OH HO
H C OH HO
H C
C
C
COH HO
H
O
O
C
C
C
O
O
O
H C
H
Fat molecule (triglyceride) +
H C
H C O
O
O
H
3 water
molecules
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
(CH2)14 CH3
H2O
H2O
H2O
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
O
Control of Metabolic Reactions 7
• Enzymes
• Control rates of metabolic reactions
• Lower activation energy needed to start reactions
• Most are globular proteins with specific shapes
• Not consumed in chemical reactions
• Substrate specific
• Shape of active site determines substrate
Product molecule
Active site
(a) (b) (c)
Substrate molecules
Unaltered
enzyme
molecule
Enzyme-substrate
complex
Enzyme
molecule
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
8
Enzymes are globular proteins that promote chemical
reactions by lowering the activation energy required to
start the reaction and enhancing the reaction rate.
They are catalysts that do not get chemically changed in
the reaction themselves .
Since they are not consumed by the reaction, they are
needed only in very small quantities.
Enzymes are specific and act only on particular
substrates. There are enzymes that make bonds and
synthesize molecules and there are those enzymes that
break bonds and degrade molecules into smaller
molecules.
Enzyme Action
9
• Metabolic pathways
• Series of enzyme-controlled reactions leading to formation
of a product
• Each new substrate is the product of the previous reaction
• Enzyme names commonly:
• Reflect the substrate
• Have the suffix – ase
• Examples: sucrase, lactase, protease,
lipase
Substrate
1
Enzyme A Substrate
2
Enzyme B Substrate
3
Enzyme C Substrate
4
Enzyme D
Product
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Cofactors and Coenzymes
10
• Cofactors
• Make some enzymes active
• Non-protein component
• Organic Ions or coenzymes such as zinc, copper,
calcium, or iron.
• Coenzymes
• Organic molecules that act as cofactors
• Small organic molecules that are often vitamins or
derived from vitamins.
Enzymes are often inactive until combining with cofactors
or coenzymes.
Factors That Alter Enzymes
11
• Factors that alter enzymes:
• Heat
• Radiation
• Electricity
• Chemicals
• Changes in pH
Regulation of Metabolic
Pathways
12
• Limited number of regulatory enzymes
• Negative feedback
Inhibition
Substrate
1
Substrate
2
Enzyme B Substrate
3
Enzyme C Substrate
4
Enzyme D
Product
Rate-limiting
Enzyme A
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
13
Important Points in Chapter 4:
Outcomes to be Assessed
4.1: Introduction
 Define metabolism.
 Explain why protein synthesis is important.
4.2: Metabolic Processes
 Compare and contrast anabolism and catabolism.
 Define dehydration synthesis and hydrolysis.
4.3: Control of Metabolic Reactions
 Describe how enzymes control metabolic reactions.
 List the basic steps of an enzyme-catalyzed reaction.
 Define active site.

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METABOLIC PROCESSES IN 40 CHARACTERS

  • 2. Introduction 2 • Metabolic processes – all chemical reactions that occur in the body There are two (2) types of metabolic reactions: • Anabolism • Larger molecules are made from smaller ones • Requires energy • Catabolism • Larger molecules are broken down into smaller ones • Releases energy
  • 3. Anabolism 3 • Anabolism provides the materials needed for cellular growth and repair • Dehydration synthesis • Type of anabolic process • Used to make polysaccharides, triglycerides, and proteins • Produces water CH2OH H H OH O H OH Monosaccharide + HHO H OH H H OH O H OH Monosaccharide HHO H OH H H OH O H OH Disaccharide H2O Water+ HHO H H H OH O H OH HO H OH Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. CH2OH CH2OH CH2OH
  • 4. Amino acid N H H C C H R Dipeptide molecule ++ Peptide bond Amino acid N H H C C H H H R H O N H H C C H R H O N H C C OH R H O O N H H C C H R N H C C OH R H O O Water Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. O O H2O Anabolism 4 H C H Glycerol 3 fatty acid molecules+ OH HO H C OH HO H C C C COH HO H O O C C C O O O H C H Fat molecule (triglyceride) + H C H C O O O H 3 water molecules (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 H2O H2O H2O Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. O
  • 5. Catabolism 5 • Catabolism breaks down larger molecules into smaller ones • Hydrolysis • A catabolic process • Used to decompose carbohydrates, lipids, and proteins • Water is used to split the substances • Reverse of dehydration synthesis CH2OH H H OH O H OH Monosaccharide + HHO H OH H H OH O H OH Monosaccharide HHO H OH H H OH O H OH Disaccharide H2O Water+ HHO H H H OH O H OH HO H OH Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. CH2OH CH2OH CH2OH
  • 6. Catabolism 6 Amino acid N H H C C H R Dipeptide molecule ++ Peptide bond Amino acid N H H C C H H H R H O N H H C C H R H O N H C C OH R H O O N H H C C H R N H C C OH R H O O Water Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. O O H2O H C H Glycerol 3 fatty acid molecules+ OH HO H C OH HO H C C C COH HO H O O C C C O O O H C H Fat molecule (triglyceride) + H C H C O O O H 3 water molecules (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 (CH2)14 CH3 H2O H2O H2O Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. O
  • 7. Control of Metabolic Reactions 7 • Enzymes • Control rates of metabolic reactions • Lower activation energy needed to start reactions • Most are globular proteins with specific shapes • Not consumed in chemical reactions • Substrate specific • Shape of active site determines substrate Product molecule Active site (a) (b) (c) Substrate molecules Unaltered enzyme molecule Enzyme-substrate complex Enzyme molecule Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  • 8. 8 Enzymes are globular proteins that promote chemical reactions by lowering the activation energy required to start the reaction and enhancing the reaction rate. They are catalysts that do not get chemically changed in the reaction themselves . Since they are not consumed by the reaction, they are needed only in very small quantities. Enzymes are specific and act only on particular substrates. There are enzymes that make bonds and synthesize molecules and there are those enzymes that break bonds and degrade molecules into smaller molecules.
  • 9. Enzyme Action 9 • Metabolic pathways • Series of enzyme-controlled reactions leading to formation of a product • Each new substrate is the product of the previous reaction • Enzyme names commonly: • Reflect the substrate • Have the suffix – ase • Examples: sucrase, lactase, protease, lipase Substrate 1 Enzyme A Substrate 2 Enzyme B Substrate 3 Enzyme C Substrate 4 Enzyme D Product Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  • 10. Cofactors and Coenzymes 10 • Cofactors • Make some enzymes active • Non-protein component • Organic Ions or coenzymes such as zinc, copper, calcium, or iron. • Coenzymes • Organic molecules that act as cofactors • Small organic molecules that are often vitamins or derived from vitamins. Enzymes are often inactive until combining with cofactors or coenzymes.
  • 11. Factors That Alter Enzymes 11 • Factors that alter enzymes: • Heat • Radiation • Electricity • Chemicals • Changes in pH
  • 12. Regulation of Metabolic Pathways 12 • Limited number of regulatory enzymes • Negative feedback Inhibition Substrate 1 Substrate 2 Enzyme B Substrate 3 Enzyme C Substrate 4 Enzyme D Product Rate-limiting Enzyme A Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  • 13. 13 Important Points in Chapter 4: Outcomes to be Assessed 4.1: Introduction  Define metabolism.  Explain why protein synthesis is important. 4.2: Metabolic Processes  Compare and contrast anabolism and catabolism.  Define dehydration synthesis and hydrolysis. 4.3: Control of Metabolic Reactions  Describe how enzymes control metabolic reactions.  List the basic steps of an enzyme-catalyzed reaction.  Define active site.