title: The RAGNYA fold: a novel fold with multiple topological variants found in functionally diverse nucleic acid, nucleotide and peptide-binding proteins.
abstract: Using sensitive structure similarity searches, we identify a shared alpha+beta fold, RAGNYA, principally involved in nucleic acid, nucleotide or peptide interactions in a diverse group of proteins. These include the Ribosomal proteins L3 and L1, ATP-grasp modules, the GYF domain, DNA-recombination proteins of the NinB family from caudate bacteriophages, the C-terminal DNA-interacting domain of the Y-family DNA polymerases, the uncharacterized enzyme AMMECR1, the siRNA silencing repressor of tombusviruses, tRNA Wybutosine biosynthesis enzyme Tyw3p, DNA/RNA ligases and related nucleotidyltransferases and the Enhancer of rudimentary proteins. This fold exhibits three distinct circularly permuted versions and is composed of an internal repeat of a unit with two-strands and a helix. We show that despite considerable structural diversity in the fold, its representatives show a common mode of nucleic acid or nucleotide interaction via the exposed face of the sheet. Using this information and sensitive profile-based sequence searches: (1) we predict the active site, and mode of substrate interaction of the Wybutosine biosynthesis enzyme, Tyw3p, and a potential catalytic role for AMMECR1. (2) We provide insights regarding the mode of nucleic acid interaction of the NinB proteins, and the evolution of the active site of classical ATP-grasp enzymes and DNA/RNA ligases. (3) We also present evidence for a bacterial origin of the GYF domain and propose how this version of the fold might have been utilized in peptide interactions in the context of nucleoprotein complexes.
authors: National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.
authors: S
authors: S
authors: Balaji
authors: L
authors: L
authors: Aravind
mesh_terms: D001665:Binding Sites; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000145:classification; D004798:Enzymes / Q000737:chemistry; D019143:Evolution, Molecular; D008958:Models, Molecular; D009711:Nucleotides / Q000378:metabolism; D010455:Peptides / Q000378:metabolism; D011485:Protein Binding; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D016601:RNA-Binding Proteins / Q000737:chemistry* / Q000145:classification
chemical_list: D004268:DNA-Binding Proteins; D004798:Enzymes; D009711:Nucleotides; D010455:Peptides; D016601:RNA-Binding Proteins
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