1koo

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spinqualitylabelsall models 1koo, resolution 3.8Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

THE CRYSTAL STRUCTURE AND MUTATIONAL ANALYSIS OF A NOVEL RNA-BINDING DOMAIN FOUND IN THE HUMAN TAP NUCLEAR MRNA EXPORT FACTOR

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

The Tap protein mediates the sequence nonspecific nuclear export of, cellular mRNAs as well as the sequence-specific export of retroviral mRNAs, bearing the constitutive transport element (CTE). Previously, the, structures of individual Tap subdomains, including ribonucleoprotein and, leucine-rich repeat domains, have been described. Here, we report the, crystal structure of a functional CTE RNA-binding domain of human Tap, including the N-terminal arm of the ribonucleoprotein domain and, interdomain linking polypeptide. To identify residues that interact with, the CTE, we have introduced 38 alanine substitutions for surface residues, in the Tap CTE-binding domain and tested these mutants for their ability, to support CTE-dependent nuclear RNA export and CTE binding. Four residues, that cluster on a concave surface in the leucine-rich repeat domain were, found to be critical for CTE binding and define a CTE-interacting surface, on this domain. The second critical CTE-interacting surface on Tap is, defined by three previously identified residues on the surface of the, ribonucleoprotein domain. The structural and mutational data define a, novel RNA-binding site on the Tap protein.

Disease

Known diseases associated with this structure: Bare lymphocyte syndrome, type I OMIM:[170260]

About this Structure

1KOO is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

The crystal structure and mutational analysis of a novel RNA-binding domain found in the human Tap nuclear mRNA export factor., Ho DN, Coburn GA, Kang Y, Cullen BR, Georgiadis MM, Proc Natl Acad Sci U S A. 2002 Feb 19;99(4):1888-93. PMID:11854490

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