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1wmf

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{{STRUCTURE_1wmf| PDB=1wmf | SCENE= }}
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'''Crystal Structure of alkaline serine protease KP-43 from Bacillus sp. KSM-KP43 (oxidized form, 1.73 angstrom)'''
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===Crystal Structure of alkaline serine protease KP-43 from Bacillus sp. KSM-KP43 (oxidized form, 1.73 angstrom)===
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==Overview==
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The crystal structure of an oxidatively stable subtilisin-like alkaline serine protease, KP-43 from Bacillus sp. KSM-KP43, with a C-terminal extension domain, was determined by the multiple isomorphous replacements method with anomalous scattering. The native form was refined to a crystallographic R factor of 0.134 (Rfree of 0.169) at 1.30-A resolution. KP-43 consists of two domains, a subtilisin-like alpha/beta domain and a C-terminal jelly roll beta-barrel domain. The topological architecture of the molecule is similar to that of kexin and furin, which belong to the subtilisin-like proprotein convertases, whereas the amino acid sequence and the binding orientation of the C-terminal beta-barrel domain both differ in each case. Since the C-terminal domains of subtilisin-like proprotein convertases are essential for folding themselves, the domain of KP-43 is also thought to play such a role. KP-43 is known to be an oxidation-resistant protease among the general subtilisin-like proteases. To investigate how KP-43 resists oxidizing reagents, the structure of oxidized KP-43 was also determined and refined to a crystallographic R factor of 0.142 (Rfree of 0.212) at 1.73-A resolution. The structure analysis revealed that Met-256, adjacent to catalytic Ser-255, was oxidized similarly to an equivalent residue in subtilisin BPN'. Although KP-43, as well as proteinase K and subtilisin Carlsberg, lose their hydrolyzing activity against synthetic peptides after oxidation treatment, all of them retain 70-80% activity against proteinaceous substrates. These results, as well as the beta-casein digestion pattern analysis, have indicated that the oxidation of the methionine adjacent to the catalytic serine is not a dominant modification but might alter the substrate specificities.
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==About this Structure==
==About this Structure==
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[[Category: Alpha-beta hydrolase fold]]
[[Category: Alpha-beta hydrolase fold]]
[[Category: Jelly-roll beta-barrel]]
[[Category: Jelly-roll beta-barrel]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat Jul 5 16:21:01 2008''

Revision as of 13:21, 5 July 2008

Image:1wmf.png

Template:STRUCTURE 1wmf

Crystal Structure of alkaline serine protease KP-43 from Bacillus sp. KSM-KP43 (oxidized form, 1.73 angstrom)

Template:ABSTRACT PUBMED 15342641

About this Structure

1WMF is a Single protein structure of sequence from Bacteria. Full crystallographic information is available from OCA.

Reference

The crystal structure of an oxidatively stable subtilisin-like alkaline serine protease, KP-43, with a C-terminal beta-barrel domain., Nonaka T, Fujihashi M, Kita A, Saeki K, Ito S, Horikoshi K, Miki K, J Biol Chem. 2004 Nov 5;279(45):47344-51. Epub 2004 Sep 1. PMID:15342641

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