obsolete N-terminal peptidyl-cysteine condensation with pyruvate to form N-pyruvic acid 2-iminyl-L-cysteine (obsolete GO:0018386)
OBSOLETE. The condensation of pyruvate through the 2-oxo group with the N-terminal cysteine of proteins to form the derivative N-pyruvic acid 2-iminyl-L-cysteine.