4jyb

MeaB, A Bacterial Homolog of MMAA, Bound to GMPPNP

spinqualitylabelsall models 4jyb, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4jyb is a 2 chain structure with sequence from Methylorubrum extorquens AM1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: GNP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function C5AP93_METEA Publication Abstract from PubMed Fidelity during cofactor assembly is essential for the proper functioning of metalloenzymes and is ensured by specific chaperones. MeaB, a G-protein chaperone for the coenzyme B12-dependent radical enzyme methylmalonyl-CoA mutase (MCM), uses the energy of GTP binding, hydrolysis or both to regulate cofactor loading into MCM, protect MCM from inactivation and rescue MCM that is inactivated during turnover. Typically, G proteins signal to client proteins using the conformationally mobile switch I and II loops. Crystallographic snapshots of MeaB reported herein reveal a new switch III element that has substantial conformational plasticity. Using alanine-scanning mutagenesis, we demonstrate that the switch III motif is critical for bidirectional signal transmission of the GTPase-activating protein activity of MCM and the chaperone functions of MeaB in the MeaB-MCM complex. Mutations in the switch III loop identified in patients corrupt this interprotein communication and lead to methylmalonic aciduria, an inborn error of metabolism. A switch III motif relays signaling between a B enzyme and its G-protein chaperone.,Lofgren M, Padovani D, Koutmos M, Banerjee R Nat Chem Biol. 2013 Jul 21. doi: 10.1038/nchembio.1298. PMID:23873214 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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