2k7v
From Proteopedia
Deletions in a surface loop divert the folding of a protein domain into a metastable dimeric form
Structural highlights
FunctionODP2_ECOLI The pyruvate dehydrogenase complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2). It contains multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedA prominent surface loop links the first two beta strands of the lipoyl domain (E2plip) from the pyruvate dehydrogenase multienzyme complex of Escherichia coli. We show here that shortening this loop by two residues generates a protein that populates two structurally distinct stable conformers: an active, native-like monomer (HM) and a functionally compromised misfolded dimer (LM). Conversion of LM to HM was observed after exposure to temperatures above 50 degrees C. Removal of two additional residues from the loop caused the protein to adopt exclusively the misfolded conformation. Detailed NMR structural studies of the misfolded dimer reveal that the N-terminal half of the domain was unfolded and dynamic, whereas the C-terminal halves of two monomers had associated to form a structure with two-fold symmetry and a topology mimicking that of the folded monomer. The surface loop is therefore a hitherto unsuspected determinant in the folding process that leads to a functional protein. A surface loop directs conformational switching of a lipoyl domain between a folded and a novel misfolded structure.,Stott KM, Yusof AM, Perham RN, Jones DD Structure. 2009 Aug 12;17(8):1117-27. PMID:19679089[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. Loading citation details.. Citations No citations found See AlsoReferences
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