2qfg

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[[Image:2qfg.jpg|left|200px]]
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{{STRUCTURE_2qfg| PDB=2qfg | SCENE= }}
{{STRUCTURE_2qfg| PDB=2qfg | SCENE= }}
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'''Solution Structure of the N-terminal SCR-1/5 fragment of Complement Factor H.'''
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===Solution Structure of the N-terminal SCR-1/5 fragment of Complement Factor H.===
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==Overview==
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Factor H (FH) is a plasma glycoprotein that plays a central role in regulation of the alternative pathway of complement. It is composed of 20 short complement regulator (SCR) domains. The SCR-1/5 fragment is required for decay acceleration and cofactor activity, while the SCR-16/20 fragment possesses binding sites for complement C3d and heparin. X-ray scattering and analytical ultracentrifugation showed that SCR-1/5 was monomeric, while SCR-16/20 formed dimers. The Guinier radius of gyration R(G) of 4.3 nm for SCR-1/5 and those of 4.7 nm and about 7.8 nm for monomeric and dimeric SCR-16/20, respectively, showed that their structures are partially folded back and bent. The distance distribution function P(r) showed that SCR-1/5 has a maximum dimension of 15 nm while monomeric and dimeric SCR-16/20 are 17 nm and about 27 nm long, respectively. The sedimentation coefficient of 2.4 S for SCR-1/5 showed no concentration-dependence, while that for SCR-16/20 was 2.8 S for the monomer and 3.9 S for the dimer. Sedimentation equilibrium data showed that SCR-1/5 is monomeric while SCR-16/20 exhibited a weak monomer-dimer equilibrium with a dissociation constant of 16 microM. The constrained scattering and sedimentation modelling of SCR-1/5 and SCR-16/20 showed that partially folded-back and bent flexible SCR arrangements fitted both data sets better than extended linear arrangements, and that the dimer was best modelled in the SCR-16/20 model by an end-to-end association of two SCR-20 domains. The SCR-1/5 and SCR-16/20 models were conformationally similar to the previously determined partially folded-back structure for intact wild-type FH, hence suggesting a partial explanation of the intact FH structure. Comparison of the SCR-16/20 model with the crystal structure of C3b clarified reasons for the distribution of mutations leading to atypical haemolytic uraemic syndrome.
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{{ABSTRACT_PUBMED_18005991}}
==About this Structure==
==About this Structure==
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[[Category: Sushi]]
[[Category: Sushi]]
[[Category: X-ray scattering]]
[[Category: X-ray scattering]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 14:52:07 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 19:43:42 2008''

Revision as of 16:43, 28 July 2008

Image:2qfg.png

Template:STRUCTURE 2qfg

Solution Structure of the N-terminal SCR-1/5 fragment of Complement Factor H.

Template:ABSTRACT PUBMED 18005991

About this Structure

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

Reference

The regulatory SCR-1/5 and cell surface-binding SCR-16/20 fragments of factor H reveal partially folded-back solution structures and different self-associative properties., Okemefuna AI, Gilbert HE, Griggs KM, Ormsby RJ, Gordon DL, Perkins SJ, J Mol Biol. 2008 Jan 4;375(1):80-101. Epub 2007 Sep 14. PMID:18005991

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