(a) Draw the structure of a phosphotyrosine residue.

(b) Would the equilibrium constant for formation of a phosphotyrosine residue from ATP (by a reaction analogous to the one shown in Eq. 27.43) be greater than, less than, or about the same as K_eq for the phosphorylation of a serine residue? Explain.

Transcribed Image Text:

protein C=O CH-CH₂OH NH protein a serine residue in a protein + -O-P-O-P-O-P-OCH₂ adenine 0 Mg2+ protein C=O T NH protein 0 ATP (Mg2+ complex) CH-CH₂O-P-0 + 0- a phosphoserine residue in a protein OH OH HO-P-O-P-O-CH₂ adenine Mg a protein-serine kinase 0 ADP (Mg²+ complex) OH OH (27.43)