Author:
González Javier M.,Marti-Arbona Ricardo,Chen Julian C.-H.,Unkefer Clifford J.
Abstract
Malyl-CoA lyase (MCL) is an Mg2+-dependent enzyme that catalyzes the reversible cleavage of (2S)-4-malyl-CoA to yield acetyl-CoA and glyoxylate. MCL enzymes, which are found in a variety of bacteria, are members of the citrate lyase-like family and are involved in the assimilation of one- and two-carbon compounds. Here, the 1.56 Å resolution X-ray crystal structure of MCL fromMethylobacterium extorquensAM1 with bound Mg2+is presented. Structural alignment with the closely relatedRhodobacter sphaeroidesmalyl-CoA lyase complexed with Mg2+, oxalate and CoA allows a detailed analysis of the domain motion of the enzyme caused by substrate binding. Alignment of the structures shows that a simple hinge motion centered on the conserved residues Phe268 and Thr269 moves the C-terminal domain by about 30° relative to the rest of the molecule. This domain motion positions a conserved aspartate residue located in the C-terminal domain in the active site of the adjacent monomer, which may serve as a general acid/base in the catalytic mechanism.
Funder
Los Alamos National Laboratory
Publisher
International Union of Crystallography (IUCr)
Subject
Condensed Matter Physics,Genetics,Biochemistry,Structural Biology,Biophysics
Cited by
1 articles.
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