1tyj: Difference between revisions
New page: left|200px<br /><applet load="1tyj" size="450" color="white" frame="true" align="right" spinBox="true" caption="1tyj, resolution 1.60Å" /> '''Crystal Structure An... |
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caption="1tyj, resolution 1.60Å" /> | caption="1tyj, resolution 1.60Å" /> | ||
'''Crystal Structure Analysis of type II Cohesin A11 from Bacteroides cellulosolvens'''<br /> | '''Crystal Structure Analysis of type II Cohesin A11 from Bacteroides cellulosolvens'''<br /> | ||
==Overview== | ==Overview== | ||
The incorporation of enzymes into the multi-enzyme cellulosome complex and | 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. | ||
==About this Structure== | ==About this Structure== | ||
1TYJ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacteroides_cellulosolvens Bacteroides cellulosolvens] with EDO and MOH as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | 1TYJ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacteroides_cellulosolvens Bacteroides cellulosolvens] with <scene name='pdbligand=EDO:'>EDO</scene> and <scene name='pdbligand=MOH:'>MOH</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TYJ OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Bacteroides cellulosolvens]] | [[Category: Bacteroides cellulosolvens]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Bayer, E | [[Category: Bayer, E A.]] | ||
[[Category: Frolow, F.]] | [[Category: Frolow, F.]] | ||
[[Category: Jakoby, H.]] | [[Category: Jakoby, H.]] | ||
| Line 19: | Line 19: | ||
[[Category: Noach, I.]] | [[Category: Noach, I.]] | ||
[[Category: Rosenheck, S.]] | [[Category: Rosenheck, S.]] | ||
[[Category: Shimon, L | [[Category: Shimon, L J.W.]] | ||
[[Category: EDO]] | [[Category: EDO]] | ||
[[Category: MOH]] | [[Category: MOH]] | ||
| Line 27: | Line 27: | ||
[[Category: flaps]] | [[Category: flaps]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:18:41 2008'' | ||
Revision as of 13:18, 21 February 2008
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Crystal Structure Analysis of type II Cohesin A11 from Bacteroides cellulosolvens
Overview
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.
About this Structure
1TYJ is a Single protein structure of sequence from Bacteroides cellulosolvens with EDO and MOH as ligands. 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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