PMID: 10387043 , Related PDB ids: 4REQ, 6REQ, 7REQ

Authors:

Mancia F, Smith GA, Evans PR

Title:

Crystal structure of substrate complexes of methylmalonyl-CoA mutase.

Journal:

Biochemistry. 1999 Jun 22;38(25):7999-8005.

Abstract:

X-ray crystal structures of methylmalonyl-CoA mutase in complexes with substrate methylmalonyl-CoA and inhibitors 2-carboxypropyl-CoA and 3-carboxypropyl-CoA (substrate and product analogues) show that the enzyme-substrate interactions change little during the course of the rearrangement reaction, in contrast to the large conformational change on substrate binding. The substrate complex shows a 5'-deoxyadenine molecule in the active site, bound weakly and not attached to the cobalt atom of coenzyme B12, rotated and shifted from its position in the substrate-free adenosylcobalamin complex. The position of Tyralpha89 close to the substrate explains the stereochemical selectivity of the enzyme for (2R)-methylmalonyl-CoA.