2vr9: Difference between revisions

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[[Image:2vr9.jpg|left|200px]]
{{Seed}}
[[Image:2vr9.png|left|200px]]


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{{STRUCTURE_2vr9|  PDB=2vr9  |  SCENE=  }}  
{{STRUCTURE_2vr9|  PDB=2vr9  |  SCENE=  }}  


'''DROSOPHILA ROBO IG1-2 (TETRAGONAL FORM)'''
===DROSOPHILA ROBO IG1-2 (TETRAGONAL FORM)===




==Overview==
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Recognition of the secreted protein Slit by transmembrane receptors of the Robo family provides important signals in the development of the nervous system and other organs, as well as in tumour metastasis and angiogenesis. Heparan sulphate (HS) proteoglycans serve as essential co-receptors in Slit-Robo signalling. Previous studies have shown that the second leucine-rich repeat domain of Slit, D2, binds to the N-terminal immunoglobulin-like domains of Robo, IG1-2. Here we present two crystal structures of Drosophila Robo IG1-2, one of which contains a bound heparin-derived oligosaccharide. Using structure-based mutagenesis of a Robo IG1-5 construct we identified key Slit binding residues (Thr74, Phe114, Arg117) forming a conserved patch on the surface of IG1; mutation of similarly conserved residues in IG2 had no effect on Slit binding. Mutation of conserved basic residues in IG1 (Lys69, Arg117, Lys122, Lys123), but not in IG2, reduced binding of Robo IG1-5 to heparin, in full agreement with the Robo-heparin co-crystal structure. Our collective results, together with a recent crystal structure of a minimal human Slit-Robo complex (Morlot, C., Thielens, N. M., Ravelli, R. B., Hemrika, W., Romijn, R. A., Gros, P., Cusack, S., and McCarthy, A. A. (2007) Proc. Natl. Acad. Sci. U.S.A. 104, 14923-14928), reveal a contiguous HS/heparin binding surface extending across the Slit-Robo interface. Based on the size of this composite binding site, we predict that at least five HS disaccharide units are required to support Slit-Robo signalling.
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{{ABSTRACT_PUBMED_18359766}}


==About this Structure==
==About this Structure==
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[[Category: Immunoglobulin domain]]
[[Category: Immunoglobulin domain]]
[[Category: Immunoglobulin-like domain]]
[[Category: Immunoglobulin-like domain]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:28:15 2008''

Revision as of 04:28, 29 July 2008

File:2vr9.png

Template:STRUCTURE 2vr9

DROSOPHILA ROBO IG1-2 (TETRAGONAL FORM)

Template:ABSTRACT PUBMED 18359766

About this Structure

2VR9 is a Single protein structure of sequence from Drosophila melanogaster. Full crystallographic information is available from OCA.

Reference

Structural and functional analysis of Slit and heparin binding to immunoglobulin-like domains 1 and 2 of Drosophila Robo., Fukuhara N, Howitt JA, Hussain SA, Hohenester E, J Biol Chem. 2008 Mar 20;. PMID:18359766

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