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1qzn

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[[Image:1qzn.jpg|left|200px]]
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{{STRUCTURE_1qzn| PDB=1qzn | SCENE= }}
{{STRUCTURE_1qzn| PDB=1qzn | SCENE= }}
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'''Crystal Structure Analysis of a type II cohesin domain from the cellulosome of Acetivibrio cellulolyticus'''
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===Crystal Structure Analysis of a type II cohesin domain from the cellulosome of Acetivibrio cellulolyticus===
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==Overview==
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The incorporation of enzymes into the multi-enzyme cellulosome complex and its anchoring to the bacterial cell surface are dictated by a set of binding interactions between two complementary protein modules: the cohesin and the dockerin. In this work, the X-ray crystal structure of a type-II cohesin from scaffoldin A of Bacteroides cellulosolvens has been determined to a resolution of 1.6 angstroms using molecular replacement. The type-II B. cellulosolvens cohesin (Bc-cohesin-II) is the first detailed description of a crystal structure for a type-II cohesin, and its features were compared with the known type-I cohesins from Clostridium thermocellum and Clostridium cellulolyticum (Ct-cohesin-I and Cc-cohesin-I, respectively). The overall jelly-roll topology of the type-II Bc-cohesin is very similar to that observed for the type-I cohesins with three additional secondary structures: an alpha-helix and two "beta-flaps" that disrupt the normal course of a beta-strand. In addition, beta-strand 5 is elevated by approximately 4 angstroms on the surface of the molecule, relative to the type-I Ct and Cc-cohesins. Like its type-I analogue, the hydrophobic/aromatic core of Bc-cohesin-II comprises an upper and lower core, but an additional aromatic patch and conserved tryptophan at the crown of the molecule serves to stabilize the alpha-helix of the type-II cohesin. Comparison of Bc-cohesin-II with the known type-I cohesin-dockerin heterodimer suggests that each of the additional secondary structural elements assumes a flanking position relative to the putative dockerin-binding surface. The raised ridge formed by beta-strand 5 confers additional distinctive topographic features to the proposed binding interface that collectively distinguish between the type-II and type-I cohesins.
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{{ABSTRACT_PUBMED_15808849}}
==About this Structure==
==About this Structure==
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[[Category: Cellulosome;]]
[[Category: Cellulosome;]]
[[Category: Keywords: cohesins type ii]]
[[Category: Keywords: cohesins type ii]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:53:54 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 06:38:47 2008''

Revision as of 03:38, 29 July 2008

Image:1qzn.png

Template:STRUCTURE 1qzn

Crystal Structure Analysis of a type II cohesin domain from the cellulosome of Acetivibrio cellulolyticus

Template:ABSTRACT PUBMED 15808849

About this Structure

1QZN is a Single protein structure of sequence from Acetivibrio cellulolyticus. Full crystallographic information is available from OCA.

Reference

Crystal structure of a type-II cohesin module from the Bacteroides cellulosolvens cellulosome reveals novel and distinctive secondary structural elements., Noach I, Frolow F, Jakoby H, Rosenheck S, Shimon LW, Lamed R, Bayer EA, J Mol Biol. 2005 Apr 22;348(1):1-12. PMID:15808849

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