9iz4
From Proteopedia
Crystal structure of phosphonopyruvate decarboxylase RhiEF from Bacillus subtilis ATCC6633 in complex with thiamine pyrophosphate
Structural highlights
FunctionPublication Abstract from PubMedThe RhiE and RhiF proteins work together as RhiEF and function as a thiamine pyrophosphate (TPP)-dependent phosphonopyruvate decarboxylase to produce phosphonoacetaldehyde in the rhizocticin biosynthesis pathway. In this study, we determined the crystal structure of the RhiEF complexed with TPP and Mg(2+). RhiEF forms a dimer of heterodimers, and the cofactor TPP is bound at the heterotetrameric subunit interface. Structural analysis of RhiEF revealed that the RhiE and RhiF moieties correspond to the pyrimidine-binding (PYR) and pyrophosphate-binding (PP) domains commonly found in TPP-dependent enzymes, respectively, as predicted by amino acid sequence alignment analysis. In contrast to other TPP-dependent enzymes with known structures, RhiEF has no domains other than the PYR and PP domains. Furthermore, structure-based evolutionary and sequence-based phylogenetic analyses have suggested that heteromultimeric enzymes such as RhiEF are ancestral types. These results indicate that RhiEF is one of the smallest and most ancient TPP-dependent decarboxylases. Based on the structural comparisons of RhiEF with other TPP-dependent decarboxylases, we identified the amino acid residues responsible for the catalytic mechanism of TPP-dependent decarboxylation in RhiEF. Structural Analysis of Phosphonopyruvate Decarboxylase RhiEF: First Insights into an Ancestral Heterooligomeric Thiamine Pyrophosphate-Dependent Decarboxylase.,Nakamura A, Shiina A, Fukaya T, Seki Y, Momiyama M, Kojima S Biochemistry. 2024 Dec 17;63(24):3250-3260. doi: 10.1021/acs.biochem.4c00559. , Epub 2024 Nov 25. PMID:39586109[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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