3by7

Publication Abstract from PubMed

ECX21941 represents a very large family (over 600 members) of novel, ocean metagenome-specific proteins identified by clustering of the dataset from the Global Ocean Sampling expedition. The crystal structure of ECX21941 reveals unexpected similarity to Sm/LSm proteins, which are important RNA-binding proteins, despite no detectable sequence similarity. The ECX21941 protein assembles as a homopentamer in solution and in the crystal structure when expressed in Escherichia coli and represents the first pentameric structure for this Sm/LSm family of proteins, although the actual oligomeric form in vivo is currently not known. The genomic neighborhood analysis of ECX21941 and its homologs combined with sequence similarity searches suggest a cyanophage origin for this protein. The specific functions of members of this family are unknown, but our structure analysis of ECX21941 indicates nucleic acid-binding capabilities and suggests a role in RNA and/or DNA processing.

Crystal structure of a novel Sm-like protein of putative cyanophage origin at 2.60 A resolution.,Das D, Kozbial P, Axelrod HL, Miller MD, McMullan D, Krishna SS, Abdubek P, Acosta C, Astakhova T, Burra P, Carlton D, Chen C, Chiu HJ, Clayton T, Deller MC, Duan L, Elias Y, Elsliger MA, Ernst D, Farr C, Feuerhelm J, Grzechnik A, Grzechnik SK, Hale J, Han GW, Jaroszewski L, Jin KK, Johnson HA, Klock HE, Knuth MW, Kumar A, Marciano D, Morse AT, Murphy KD, Nigoghossian E, Nopakun A, Okach L, Oommachen S, Paulsen J, Puckett C, Reyes R, Rife CL, Sefcovic N, Sudek S, Tien H, Trame C, Trout CV, van den Bedem H, Weekes D, White A, Xu Q, Hodgson KO, Wooley J, Deacon AM, Godzik A, Lesley SA, Wilson IA Proteins. 2009 May 1;75(2):296-307. PMID:19173316^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.