Protein Domain : S1 domain IPR003029

Type	Domain
Description	The S1 domain was originally identified in ribosomal protein S1 but is found in a large number of proteins involved in RNA metabolism. It belongs to the OB-fold family. The structure of the S1 RNA-binding domain from the Escherichia coli polynucleotide phosphorylase has been determined using NMR methods and consists of a five-stranded antiparallel beta barrel. Conserved residues on one face of the barrel and adjacent loops form the putative RNA-binding site [ , ].The structure of the S1 domain is very similar to that of cold shock proteins. This suggests that they may both be derived from an ancient nucleic acid-binding protein [ ].This entry does not include translation initiation factor IF-1 S1 domains.
Short Name	S1_domain