C

7-C Compound

Branch point I

Branch point I

Compound a

Compound b

Branch S point II

Phenylalanine

Tyrosine

Tryptophan

From pentose phosphate pathway

Figure 6.31 Synthesis of Aromatic Amino Acids A multistep branching pathway is used to synthesize aromatic amino acids.The end product of a branch inhibits the first enzyme of that branch; in addition, the end product inhibits one of the three enzymes that catalyze the first step of the pathway.

Nester-Anderson-Roberts: I I. Life and Death of I 6. Metabolism: Fueling Cell I I © The McGraw-Hill

Microbiology, A Human Microorganisms Growth Companies, 2003

Perspective, Fourth Edition

Amino group of aspartic acid H

Glycine

Formic acid

Amide nitrogen of glutamine

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