1fdp: Difference between revisions
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'''PROENZYME OF HUMAN COMPLEMENT FACTOR D, RECOMBINANT PROFACTOR D''' | '''PROENZYME OF HUMAN COMPLEMENT FACTOR D, RECOMBINANT PROFACTOR D''' | ||
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[[Category: Narayana, S V.L.]] | [[Category: Narayana, S V.L.]] | ||
[[Category: Volanakis, J E.]] | [[Category: Volanakis, J E.]] | ||
[[Category: | [[Category: Complement]] | ||
[[Category: | [[Category: Factor d]] | ||
[[Category: | [[Category: Proenzyme]] | ||
[[Category: | [[Category: Profactor d]] | ||
[[Category: | [[Category: Serine protease]] | ||
[[Category: | [[Category: Zymogen]] | ||
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Revision as of 13:12, 2 May 2008
PROENZYME OF HUMAN COMPLEMENT FACTOR D, RECOMBINANT PROFACTOR D
Overview
The crystal structure of profactor D, determined at 2.1 A resolution with an Rfree and an R-factor of 25.1 and 20.4%, respectively, displays highly flexible or disordered conformation for five regions: N-22, 71-76, 143-152, 187-193 and 215-223. A comparison with the structure of its mature serine protease, complement factor D, revealed major conformational changes in the similar regions. Comparisons with the zymogen-active enzyme pairs of chymotrypsinogen, trypsinogen and prethrombin-2 showed a similar distribution of the flexible regions. However, profactor D is the most flexible of the four, and its mature enzyme displays inactive, self-inhibited active site conformation. Examination of the surface properties of the N-terminus-binding pocket indicates that Ile16 may play the initial positioning role for the N-terminus, and Leu17 probably also helps in inducing the required conformational changes. This process, perhaps shared by most chymotrypsinogen-like zymogens, is followed by a factor D-unique step, the re-orientation of an external Arg218 to an internal position for salt-bridging with Asp189, leading to the generation of the self-inhibited factor D.
About this Structure
1FDP is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structural basis of profactor D activation: from a highly flexible zymogen to a novel self-inhibited serine protease, complement factor D., Jing H, Macon KJ, Moore D, DeLucas LJ, Volanakis JE, Narayana SV, EMBO J. 1999 Feb 15;18(4):804-14. PMID:10022823 Page seeded by OCA on Fri May 2 16:12:30 2008
