Pyruvate phosphate dikinase, PEP/pyruvate-binding This enzyme catalyses the reversible conversion of ATP to AMP, pyrophosphate and phosphoenolpyruvate (PEP) [<cite idref="PUB00004887"/>]. Residues at the N terminus correspond to the transit peptide which is indispensable for the transport of the precursor protein into chloroplasts in plants [<cite idref="PUB00006237"/>]. This domain is present at the N terminus of some PEP-utilizing enzymes.