Keywords:
Electronic books.
Description / Table of Contents:
This textbook provides a thorough chemocentric view on the key small molecules of life, the human vitamins and their active coenzyme forms.
Type of Medium:
Online Resource
Pages:
1 online resource (622 pages)
Edition:
1st ed.
ISBN:
9781788015424
URL:
https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=7424918
Language:
English
Note:
Intro -- Title Page -- Copyright Page -- Preface -- Acknowledgements -- Contents -- Section I: Overview -- 1 Human Vitamins: Discovery and Characterization -- 1.1 What Are Human Vitamins? -- 1.2 Vitamin Discovery: A Golden Age from 1910-1948 -- 1.3 Vitamin Deficiencies: Primary and Secondary Symptoms -- 1.4 Water-soluble Versus Fat-soluble Vitamins -- 1.5 Key Functional Groups in Vitamin Biochemistry: Heterocycles -- 1.6 Vitamins Active as Ingested Versus Those Requiring Metabolic Processing to Active Forms -- 1.7 How Vulnerable Are Humans with Dependence on These 13 Vitamins -- 1.8 Vitamin Nomenclature -- 1.9 Why Study Vitamins Now? -- 1.10 Why Do Americans Take So Many Vitamins? -- 1.11 Scope and Approach of This Volume -- 1.12 A Molecular View of Vitamin Action -- References -- 2 Metabolic Logic through the Lens of Coenzyme Forms of Human Vitamins -- 2.1 Metabolites, Metabolism, Metabolomics and How Vitamins Fit in the Picture -- 2.2 All Eight B Vitamins Function as Coenzymes -- 2.3 NADH, Acetyl-CoA, ATP as Thermodynamically Activated Kinetically Stable Molecules that are the Products of Catabolic Pathways -- 2.4 The Logic of Anabolic Metabolism -- 2.5 Central Metabolic Pathways in Humans Depend on the Coenzyme Forms of Vitamins at Key Nodal Points -- References -- Section II: The Metabolic Roles of the Water-soluble Vitamins -- 3 Vitamin B1 Converted to the Coenzyme Thiamin Pyrophosphate -- 3.1 Discovery of Thiamin -- 3.2 Pyrophosphorylation of Thiamin Yields the Coenzymatically Active Thiamin Pyrophosphate (TPP) -- 3.3 C2-hydrogen Exchange of Thiamin and Thiamin-PP is the Key to their Chemical Biology -- 3.4 The Metabolic Niches for Thiamin-PP in Humans -- 3.5 α-Keto Acid versus β-Keto Acid Decarboxylation Mechanisms -- 3.6 Enzymatic Machinery to Convert α-Keto Acids from Nonoxidative to Oxidative Outcomes.
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3.7 Transketolase: Ketol Transfers between Aldose Sugar Cosubstrates -- 3.8 Peroxisomal Fatty Acyl Thioester Lyase -- 3.9 Summary on Thiamin Chemical Biology and Metabolic Roles -- References -- 4 Vitamin B2 Riboflavin -- 4.1 Discovery of Riboflavin -- 4.2 Logic for Biosynthesis in Microbes and Commercial Production Strategies -- 4.3 Conversion of Vitamin B2 to the Coenzyme Forms FMN and FAD -- 4.4 Why Should We Care About Electron Transfer Coenzymes in Metabolism? -- 4.5 The Chemical Biology of Riboflavin as Two Electron/One Electron Step Down Redox Transformer in Cell Metabolism -- 4.6 Flavoenzyme Reoxidative Half Reactions with O2 as Cosubstrate in Obligate One Electron Transfers -- 4.7 Distinct Roles for Flavin and Nicotinamide Coenzymes Based in Differential O2 Reactivities -- 4.8 Glutathione as Cellular Guardian: The Key Role of Glutathione Reductase -- 4.9 Summary on Metabolic Redox Niches for Riboflavin-based Coenzymes -- References -- 5 Vitamin B3 Niacin and the Nicotinamide Coenzymes -- 5.1 Discovery of Vitamin B3 -- 5.2 Biosynthesis of Nicotinic Acid and of NAD+ -- 5.3 Conversion of Ingested Niacin to NAD+ and NADP+ -- 5.4 Hydride Transfers to and from NAD+ and NADP+ -- 5.5 Stereochemical Outcomes in NAD(P)H Redox Enzymatic Reactions -- 5.6 Scope of Substrate Functional Groups Oxidized or Reduced by Nicotinamide-utilizing Enzymes -- 5.7 Why Should We Care About Redox Reactions in Cells: A Brief Nicotinamide-centered Reprise -- 5.8 Functional Distinctions Between NADH and NADPH -- 5.9 Nonredox Roles for NAD+ -- 5.10 Summary of the Metabolic Functions of the Coenzyme Forms of Vitamin B3 -- References -- 6 Vitamin B5: Pantothenate -- 6.1 Discovery and Characterization of Pantothenate as Vitamin B5 -- 6.2 Biosynthesis of Pantothenate -- 6.3 Conversion of Vitamin B5 to Coenzyme A.
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6.4 The Thiol Group of Coenzyme A Is the Key to All Its Biologic Functions -- 6.5 Acyl-CoA Thioesters Are Thermodynamically Activated and Kinetically Stable Metabolites -- 6.6 Acyl-CoAs: Diffusible Cellular Packets of Acyl Group Transfer Currency -- 6.7 Acetyl-CoA as a Kinetically Accessible C2 Carbanion Equivalent for C-C Bond Formations -- 6.8 Summary -- References -- 7 Coenzyme Forms of Vitamin B6 -- 7.1 Discovery and Characterization of Vitamin B6 -- 7.2 Metabolism of Pyridoxine to the Coenzymatically Active Aldehyde Pyridoxal-Phosphate (pyridoxal-P, PLP) -- 7.3 The Resting State of PLP-dependent Enzymes Contain PLP in Aldimine Linkage to an Active Site Lysine Side Chain -- 7.4 Each Catalytic Cycle for PLP-enzymes Starts with Transaldimination between Resting PLP-Enzyme and Substrate Amino Group -- 7.5 PLP-substrate Aldimines: Carbanion Chemistry at Cα, Cβ, Cγ of the Amino Acid Scaffolds -- 7.6 PLP-Enzymes Catalyzing Transformation at Amino Acid Cα -- 7.7 Cβ-Elimination and Replacement Reactions -- 7.8 Cγ Elimination and Replacement Reactions -- 7.9 PLP-Enzymes That Make C-C Bonds with Decarboxylation -- 7.10 Glycogen Phosphorylase: PLP as Specific Acid Catalyst -- 7.11 Overview of Metabolic Roles of Coenzyme Forms of Vitamin B6 -- References -- 8 Vitamin B7: Biotin -- 8.1 Discovery and Characterization -- 8.2 Biotin Biosynthesis in Microbes and Plants but Not Vertebrates -- 8.3 Biotin Structure and Function -- 8.4 Posttranslational Incorporation of Biotin in a Small Family of Carboxylases -- 8.5 Acyl-CoA Carboxylases -- 8.6 Pyruvate Carboxylase: Mechanism and Physiologic Role -- 8.7 Tandem Action of Acetyl-CoA Carboxylase and the β-Ketoacyl Thioester Synthase in Fatty Acid Chain Elongation Steps. The Logic of Transient Carboxylations -- 8.8 Other Biotin-independent Carboxylations -- 8.9 Overview of Vitamin B7 Human Metabolism -- References.
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9 Vitamin B9: Folic Acid -- 9.1 Isolation and Characterization of Vitamin B9 -- 9.2 Biosynthesis and Chemistry of the Bicyclic Pterin Ring System -- 9.3 Conversion of Vitamin B9 to the Active Coenzyme Forms -- 9.4 Folate Deficiency -- 9.5 One-carbon Oxidation States in Metabolism -- 9.6 Serine Transhydroxymethylase, Nascent Formaldehyde, and FH4 as Formaldehyde Sponge -- 9.7 Redox Changes of the Attached C1 Unit -- 9.8 One-carbon Units Transferred Out At All Three Oxidation States -- 9.9 Biopterins versus Folates -- 9.10 Overview -- References -- 10 Vitamin B12: Two Coenzyme Forms -- 10.1 Isolation and Characterization -- 10.2 Vitamin B12 Properties -- 10.3 Biosynthetic Logic -- 10.4 Conversion to Coenzymatically Active Forms -- 10.5 Adenosyl-B12 as Radical Generator in 1,2-Rearrangements: Methylmalonyl-CoA Mutase -- 10.6 Methyl-B12 as Donor of [CH3+] in Methionine Synthase -- 10.7 How B12 Deficiency Traps Tetrahydrofolate and Blocks DNA Synthesis -- 10.8 Similarity Between Adenosyl-B12 and S-Adenosylmethionine as 5-Deoxyadenosine Radical Generators -- 10.9 Overview -- References -- 11 Vitamin C: Ascorbic Acid -- 11.1 Discovery and Characterization of Ascorbic Acid as Vitamin C -- 11.2 Vitamin C Biosynthesis and the Missing Step in Humans -- 11.3 Chemistry of Vitamin C: One and Two Electron Reductions -- 11.4 Two Biological Redox Functions for Vitamin C -- 11.5 Cofactor Role for Eight Nonheme Iron and Two Copper Oxygenases -- 11.6 Mechanism and Role of Prolyl Hydroxylation in Collagen Triple Helix Formation and Maturation -- 11.7 Dopamine-β-Hydroxylase and Peptidylglycine α-Amidating Monooxygenase -- 11.8 Nonspecific Role in Scavenging Reactive Oxidant Flux -- 11.9 Overview of Vitamin C Metabolic Functions -- References -- Section III: The Metabolic Roles of Lipid-soluble Vitamins.
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12 Vitamin A: Three Vitamer Forms: Retinol, Retinal, and Retinoic Acid -- 12.1 Discovery and Characterization of Vitamin A -- 12.2 Three Vitamer Forms, Two with Distinct Biologic Activities. Metabolic Conversions in Humans -- 12.3 Retinal Biosynthesis from β-Carotene Follows Isoprenoid Lineage -- 12.4 Vitamin A Deficiency -- 12.5 Uptake, Extracellular, and Intracellular Transport of Vitamin A Forms -- 12.6 Role of Retinyl Esters and Retinal in the Visual Cycle -- 12.7 Retinoic Acid Effects in Development, Immune System Function, Reproduction and Gene Transcription -- 12.8 Retinoic Acid as Ligand for the RAR Subset of Nuclear Hormone Receptors -- 12.9 Therapeutic Intervention in Acne and in Acute Promyelocytic Leukemia -- 12.10 Overview: Vitamin or Hormone -- References -- 13 Vitamin D -- 13.1 Vitamin D Is a Steroid-derived Metabolite -- 13.2 Discovery and Characterization of Vitamin D as Antirachitic Factor -- 13.3 Biosynthesis of Vitamin D3 in Skin -- 13.4 Enzymatic Conversion of Vitamin D3 to Calcitriol -- 13.5 Regulation of Calcium and Phosphate Metabolism -- 13.6 Calcitriol as Ligand for Vitamin D Receptor as Transcriptional Regulator -- 13.7 Vitamin D Receptors in Many Other Tissues -- 13.8 VDR-independent Effects of 1,25-Dihydroxy Vitamin D3 -- 13.9 Summary -- References -- 14 Vitamin E -- 14.1 Discovery and Structure of Vitamin E -- 14.2 Biosynthetic Logic for Vitamin E -- 14.3 Redox Chemistry of Tocopherols and Tocotrienols -- 14.4 Uptake and Transport of Vitamin E to Tissues -- 14.5 Antioxidant to Interrupt Lipid Peroxide Radical Chains -- 14.6 Cellular Antioxidant Pyramid: The Full Arsenal -- 14.7 Overview -- References -- 15 Vitamin K -- 15.1 Discovery of Vitamin K1 and K2 -- 15.2 Vitamin K Deficiency and Hemophilia A versus B -- 15.3 Proteins of the Blood Coagulation Cascade -- 15.4 Biosynthesis of Vitamin K1 and K2.
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15.5 Role of Phylloquinones and Plastoquinones in Plant Chloroplasts.
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