Amino-acid sequence folds into functional structure.
Shape, charge and dynamics influence binding and catalysis.
Side 130
Biochemistry
Life examined at the level where chemistry becomes organized metabolism, catalysis, signaling and molecular information flow.
molecule→reaction→energy→network→regulation
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16working concepts
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Structure constrains biological chemistry.
Proteins, nucleic acids, lipids and carbohydrates differ because their chemical structures create different interaction possibilities.
Sequence stores and transfers molecular information.
Base pairing enables templated replication and recognition.
Amphipathic molecules form membranes.
Membranes create compartments and chemical gradients essential to cellular organization.
Sugars store energy and encode structure.
Polysaccharides and glycoconjugates serve both metabolic and recognition roles.
Enzymes reshape reaction rates without changing thermodynamic endpoints.
Catalysis works by lowering activation barriers and stabilizing reaction pathways.
Substrates enter a structured active site.
Specificity is usually graded and depends on molecular complementarity.
Catalysis stabilizes high-energy configurations.
The enzyme changes reaction kinetics rather than the overall free-energy difference.
Products leave and the catalyst cycles again.
Rate depends on substrate concentration, catalytic steps and inhibition.
Activity responds to cellular context.
Allostery, modification and localization adjust enzyme behavior without changing its primary sequence.
Cells couple favorable reactions to unfavorable work.
Free-energy transfer explains why metabolism is organized around carriers and gradients.
Phosphate transfer couples reactions.
ATP is a central energy currency but not the only carrier of chemical potential.
Electron transfer redistributes energy.
NAD-type carriers connect oxidation and reduction across metabolic pathways.
Membranes store electrochemical potential.
Ion gradients can drive transport, signaling and ATP synthesis.
One reaction can make another feasible.
Pathway organization links energetically favorable steps to required cellular work.
Metabolism is a regulated network rather than a list of pathways.
Flux through one route depends on substrates, enzyme activity, cellular demand and competing pathways.
Break down glucose into smaller intermediates.
The pathway produces energy carriers while feeding broader biosynthetic networks.
Integrate carbon oxidation with biosynthesis.
Cycle intermediates connect energy production with amino-acid and other synthetic routes.
Build complex molecules from simpler precursors.
Anabolic pathways consume energy and reducing power.
Regulation balances supply with demand.
Feedback and compartmentation help stabilize key metabolite concentrations and fluxes.
Biochemistry is chemistry constrained by living organization. The important unit is rarely an isolated reaction; it is the coupled network that channels matter, energy and information under regulation.