2dt6

From Proteopedia

Revision as of 15:22, 15 February 2008

Solution structure of the first SURP domain of human splicing factor SF3a120

Overview

The SF3a complex, consisting of SF3a60, SF3a66, and SF3a120, in 17S U2, snRNP is crucial to spliceosomal assembly. SF3a120 contains two tandem, SURP domains (SURP1 and SURP2), and SURP2 is responsible for binding to, SF3a60. We found that the SURP2 fragment forms a stable complex with an, SF3a60 fragment (residues 71-107) and solved its structure by NMR, spectroscopy. SURP2 exhibits a fold of the alpha1-alpha2-3(10)-alpha3, topology, and the SF3a60 fragment forms an amphipathic alpha helix, intimately contacting alpha1 of SURP2. We also solved the SURP1 structure, which has the same fold as SURP2. The protein-binding interface of SURP2, is quite similar to the corresponding surface of SURP1, except for two, amino acid residues. One of them, Leu169, is characteristic of SF3a120, SURP2 among SURP domains. Mutagenesis showed that this single Leu residue, is the critical determinant for complex formation, which reveals the, protein recognition mechanism in the subunit assembly.

About this Structure

2DT6 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Solution structures of the SURP domains and the subunit-assembly mechanism within the splicing factor SF3a complex in 17S U2 snRNP., Kuwasako K, He F, Inoue M, Tanaka A, Sugano S, Guntert P, Muto Y, Yokoyama S, Structure. 2006 Nov;14(11):1677-89. PMID:17098193

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