2jx5 | pdb_00002jx5

Solution structure of the ubiquitin domain N-terminal to the S27a ribosomal subunit of Giardia lamblia

spinqualitylabelsall models 2jx5 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2jx5 is a 1 chain structure with sequence from Giardia lamblia ATCC 50803. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A8BNY1_GIAIC Publication Abstract from PubMed Encoded by a multigene family, ubiquitin is expressed in the form of three precursor proteins, two of which are fusions to the ribosomal subunits S27a and L40. Ubiquitin assists in ribosome biogenesis and also functions as a post-translational modifier after its release from S27a or L40. However, several species do not conserve the ribosomal ubiquitin domains. We report here the solution structure of a distant variant of ubiquitin, found at the N-terminus of S27a in Giardia lamblia, referred to as GlUb(S27a). Despite the considerable evolutionary distance that separates ubiquitin from GlUb(S27a), the structure of GlUb(S27a) is largely identical to that of ubiquitin. The variant domain remains attached to S27a and is part of the assembled holoribosome. Thus, conservation of tertiary structure suggests a role of this variant as a chaperone, while conservation of the primary structure--necessary for ubiquitin's function as a post-translational modifier--is no longer required. Based on these observations, we propose a model to explain the origin of the widespread ubiquitin superfold in eukaryotes. Sequence and structure evolved separately in a ribosomal ubiquitin variant.,Catic A, Sun ZY, Ratner DM, Misaghi S, Spooner E, Samuelson J, Wagner G, Ploegh HL EMBO J. 2007 Jul 25;26(14):3474-83. Epub 2007 Jun 28. PMID:17599068 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosomal protein S27

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