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| | {{STRUCTURE_1zlg| PDB=1zlg | SCENE= }} | | {{STRUCTURE_1zlg| PDB=1zlg | SCENE= }} |
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| - | '''Solution structure of the extracellular matrix protein anosmin-1'''
| + | ===Solution structure of the extracellular matrix protein anosmin-1=== |
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| - | ==Overview==
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| - | Kallmann's syndrome corresponds to a loss of sense of smell and hypogonadotrophic hypogonadism. Defects in anosmin-1 result in the X-linked inherited form of Kallmann's syndrome. Anosmin-1 is an extracellular matrix protein comprised of an N-terminal, cysteine-rich (Cys-box) domain and a whey acidic protein-like (WAP) domain, followed by four fibronectin type III (FnIII) domains. The solution structures of recombinant proteins containing the first three domains (PIWF1) and all six domains (PIWF4) were determined by X-ray scattering and analytical ultracentrifugation. Guinier analyses showed that PIWF1 and PIWF4 have different radii of gyration (R(G)) values of 3.1 nm and 6.7 nm, respectively, but similar cross-sectional radii of gyration (R(XS)) values of 1.5 nm and 1.9 nm, respectively. Distance distribution functions showed that the maximum lengths of PIWF1 and PIWF4 were 11 nm and 23 nm, respectively. Analytical ultracentrifugation gave sedimentation coefficients of 2.52 S and 3.55 S for PIWF1 and PIWF4, respectively. The interpretation of the scattering data by constrained modelling requires homology models for all six domains in anosmin-1. While models were already available for the WAP and FnIII domains, searches suggested the Cys-box domain may resemble the cysteine-rich region of the insulin-like growth factor receptor. Automated constrained molecular modelling based on joining the anosmin-1 domains with structurally randomised linkers resulted in 10,000 models for anosmin-1. A trial-and-error search showed that about 0.1-1.4% of these models fitted the X-ray data. The best models showed that the three domains and six domains in PIWF1 and PIWF4, respectively, were extended. The inter-domain linkers in anosmin-1 could not all be extended at the same time, and there was evidence for inter-domain flexibility. Models with folded-back domain arrangements do not fit the data. These solution structures account for the known biological function of anosmin-1, in particular its ability to interact with its three macromolecular ligands.
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Insulin-like growth factor receptor cys-rich fold]] | | [[Category: Insulin-like growth factor receptor cys-rich fold]] |
| | [[Category: Whey acidic protein fold]] | | [[Category: Whey acidic protein fold]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:46:17 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:39:54 2008'' |
Revision as of 04:39, 29 July 2008
Template:STRUCTURE 1zlg
Solution structure of the extracellular matrix protein anosmin-1
Template:ABSTRACT PUBMED 15949815
About this Structure
1ZLG is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Extended and flexible domain solution structure of the extracellular matrix protein anosmin-1 by X-ray scattering, analytical ultracentrifugation and constrained modelling., Hu Y, Sun Z, Eaton JT, Bouloux PM, Perkins SJ, J Mol Biol. 2005 Jul 15;350(3):553-70. PMID:15949815
Page seeded by OCA on Tue Jul 29 07:39:54 2008
