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biochemistry-biology-expert

Expert-level biochemistry from a biology perspective covering metabolic pathways, enzyme kinetics, bioenergetics, signal transduction, and the biochemical basis of cellular processes.

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Biochemistry Biology Expert

Before Starting

  1. Which metabolic pathway or process?
  2. Normal biochemistry or disease state?
  3. Biochemistry context — cell biology or clinical?

Core Expertise Areas

Metabolic Pathways

Glycolysis: glucose to pyruvate, 10 steps, net 2 ATP, 2 NADH. TCA cycle: acetyl-CoA to CO2, 3 NADH + 1 FADH2 + 1 GTP per turn. Oxidative phosphorylation: ETC + ATP synthase, 32-34 ATP per glucose. Fatty acid oxidation: beta-oxidation, 2C units as acetyl-CoA per cycle. Gluconeogenesis: non-carbohydrate precursors to glucose, liver and kidney. Pentose phosphate pathway: NADPH production and ribose-5-phosphate.

Enzyme Kinetics

Michaelis-Menten: v = Vmax[S]/(Km + [S]). Km: substrate concentration at half-maximal velocity. kcat: turnover number — reactions per enzyme per second. Inhibition: competitive (raises Km), uncompetitive (lowers both), noncompetitive (lowers Vmax). Allosteric regulation: effectors change enzyme activity without competing with substrate.

Bioenergetics

Free energy: delta_G = delta_G0 + RTlnQ. ATP hydrolysis: delta_G = -30.5 kJ/mol (standard), much more negative in cell. Chemiosmosis: proton gradient across inner mitochondrial membrane drives ATP synthase. Uncoupling: protonophores (DNP) dissipate gradient as heat without ATP synthesis.

Signal Transduction

GPCR signaling: ligand -> Gs -> adenylyl cyclase -> cAMP -> PKA -> phosphorylation. RTK signaling: ligand -> dimerization -> autophosphorylation -> RAS -> MAPK cascade. PI3K-AKT: RTK -> PI3K -> PIP3 -> AKT -> mTOR — growth and survival. Second messengers: cAMP, cGMP, IP3, DAG, Ca2+.

Key Patterns

Best Practices

  • Track cofactor oxidation states through pathways
  • Consider subcellular compartmentalization of metabolic reactions
  • Account for allosteric regulation at key regulatory enzymes
  • Remember that in vivo delta_G differs greatly from standard conditions
  • Integrate with hormonal regulation of metabolism

Common Pitfalls

PitfallFix
Confusing delta_G0 with delta_GCellular conditions make delta_G very different from standard
Forgetting NADH/FADH2 in ATP countThese carry most of the energy from TCA
Ignoring allosteric regulationKey enzymes are highly regulated, not just kinetically limited
Confusing competitive inhibition typesDraw double-reciprocal plots to distinguish

Related Skills

  • cell-biology-expert
  • molecular-biology-expert
  • physiology-expert
  • biochemistry-expert

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