1f5j: Difference between revisions
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New page: left|200px<br /><applet load="1f5j" size="450" color="white" frame="true" align="right" spinBox="true" caption="1f5j, resolution 1.80Å" /> '''CRYSTAL STRUCTURE OF... |
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[[Image:1f5j.jpg|left|200px]]<br /><applet load="1f5j" size=" | [[Image:1f5j.jpg|left|200px]]<br /><applet load="1f5j" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1f5j, resolution 1.80Å" /> | caption="1f5j, resolution 1.80Å" /> | ||
'''CRYSTAL STRUCTURE OF XYNB, A HIGHLY THERMOSTABLE BETA-1,4-XYLANASE FROM DICTYOGLOMUS THERMOPHILUM RT46B.1, AT 1.8 A RESOLUTION'''<br /> | '''CRYSTAL STRUCTURE OF XYNB, A HIGHLY THERMOSTABLE BETA-1,4-XYLANASE FROM DICTYOGLOMUS THERMOPHILUM RT46B.1, AT 1.8 A RESOLUTION'''<br /> | ||
==Overview== | ==Overview== | ||
Microorganisms employ a large array of enzymes to break down the cellulose | Microorganisms employ a large array of enzymes to break down the cellulose and hemicelluloses of plant biomass. These enzymes, especially those with high thermal stability, have many uses in biotechnology. We have solved the crystal structure of a beta-1, 4-xylanase, XynB, from the extremely thermophilic bacterium Dictyoglomus thermophilum, isolate Rt46B.1. The protein crystallized from 1.6 M ammonium sulfate, 0.2 M HEPES pH 7.2 and 10% glycerol, with unit-cell parameters a = b = 91.3, c = 44.9 A and space group P4(3). The structure was solved at high resolution (1.8 A) by X-ray crystallography, using the method of isomorphous replacement with a single mercury derivative, and refined to a final R factor of 18.3% (R(free) = 22.1%). XynB has the single-domain fold typical of family 11 xylanases, comprising a jelly roll of two highly twisted beta-sheets that create a deep substrate-binding cleft. The two catalytic residues, Glu90 and Glu180, occupy this cleft. Compared with other family 11 xylanases, XynB has a greater proportion of polar surface and has a slightly extended C-terminus that, combined with the extension of beta-strand A5, gives additional hydrogen bonding and hydrophobic packing. These factors may account for the enhanced thermal stability of the enzyme. | ||
==About this Structure== | ==About this Structure== | ||
1F5J is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Dictyoglomus_thermophilum Dictyoglomus thermophilum] with SO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Endo-1,4-beta-xylanase Endo-1,4-beta-xylanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.8 3.2.1.8] Full crystallographic information is available from [http:// | 1F5J is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Dictyoglomus_thermophilum Dictyoglomus thermophilum] with <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Endo-1,4-beta-xylanase Endo-1,4-beta-xylanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.8 3.2.1.8] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F5J OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Endo-1,4-beta-xylanase]] | [[Category: Endo-1,4-beta-xylanase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Baker, E | [[Category: Baker, E N.]] | ||
[[Category: McCarthy, A | [[Category: McCarthy, A A.]] | ||
[[Category: SO4]] | [[Category: SO4]] | ||
[[Category: beta-barrel]] | [[Category: beta-barrel]] | ||
[[Category: xylanase]] | [[Category: xylanase]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:35:08 2008'' | ||
