6znj | pdb_00006znj

MaeB full-length enzyme apoprotein form

spinqualitylabelsall models 6znj, resolution 3.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6znj is a 3 chain structure with sequence from Bdeba. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 6zng, 6zn4, 6zn7, 6zn9, 6zne Gene: mdh, Bd1833 (BDEBA) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Bacterial hybrid malic enzymes (MaeB grouping, multidomain) catalyse the transformation of malate to pyruvate, and are a major contributor to cellular reducing power and carbon flux. Distinct from other malic enzyme subtypes, the hybrid enzymes are regulated by acetyl-CoA, a molecular indicator of the metabolic state of the cell. Here we solve the structure of a MaeB protein, which reveals hybrid enzymes use the appended phosphotransacetylase (PTA) domain to form a hexameric sensor that communicates acetyl-CoA occupancy to the malic enzyme active site, 60 A away. We demonstrate that allostery is governed by a large-scale rearrangement that rotates the catalytic subunits 70 degrees between the two states, identifying MaeB as a new model enzyme for the study of ligand-induced conformational change. Our work provides the mechanistic basis for metabolic control of hybrid malic enzymes, and identifies inhibition-insensitive variants that may find utility in synthetic biology. A rotary mechanism for allostery in bacterial hybrid malic enzymes.,Harding CJ, Cadby IT, Moynihan PJ, Lovering AL Nat Commun. 2021 Feb 23;12(1):1228. doi: 10.1038/s41467-021-21528-2. PMID:33623032 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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