1j18

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[[Image:1j18.gif|left|200px]]
[[Image:1j18.gif|left|200px]]
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{{Structure
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|PDB= 1j18 |SIZE=350|CAPTION= <scene name='initialview01'>1j18</scene>, resolution 2.00&Aring;
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The line below this paragraph, containing "STRUCTURE_1j18", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=ACY:ACETIC+ACID'>ACY</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GLC:GLUCOSE'>GLC</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-amylase Beta-amylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.2 3.2.1.2] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1j18| PDB=1j18 | SCENE= }}
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|RELATEDENTRY=[[5bca|5BCA]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1j18 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1j18 OCA], [http://www.ebi.ac.uk/pdbsum/1j18 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1j18 RCSB]</span>
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}}
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'''Crystal Structure of a Beta-Amylase from Bacillus cereus var. mycoides Cocrystallized with Maltose'''
'''Crystal Structure of a Beta-Amylase from Bacillus cereus var. mycoides Cocrystallized with Maltose'''
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[[Category: Nishimura, S.]]
[[Category: Nishimura, S.]]
[[Category: Nitta, Y.]]
[[Category: Nitta, Y.]]
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[[Category: amylase]]
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[[Category: Amylase]]
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[[Category: beta-amylase]]
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[[Category: Beta-amylase]]
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[[Category: complex]]
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[[Category: Complex]]
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[[Category: maltose]]
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[[Category: Maltose]]
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[[Category: tim barel]]
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[[Category: Tim barel]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:40:36 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:27:31 2008''
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Revision as of 17:40, 2 May 2008

Image:1j18.gif

Template:STRUCTURE 1j18

Crystal Structure of a Beta-Amylase from Bacillus cereus var. mycoides Cocrystallized with Maltose


Overview

The X-ray crystal structure of a catalytic site mutant of beta-amylase, E172A (Glu172 --> Ala), from Bacillus cereus var. mycoides complexed with a substrate, maltopentaose (G5), and the wild-type enzyme complexed with maltose were determined at 2.1 and 2.0 A resolution, respectively. Clear and continuous density corresponding to G5 was observed in the active site of E172A, and thus, the substrate, G5, was not hydrolyzed. All glucose residues adopted a relaxed (4)C(1) conformation, and the conformation of the maltose unit for Glc2 and Glc3 was much different from those of other maltose units, where each glucose residue of G5 is named Glc1-Glc5 (Glc1 is at the nonreducing end). A water molecule was observed 3.3 A from the C1 atom of Glc2, and 3.0 A apart from the OE1 atom of Glu367 which acts as a general base. In the wild-type enzyme-maltose complex, two maltose molecules bind at subsites -2 and -1 and at subsites +1 and +2 in tandem. The conformation of the maltose molecules was similar to that of the condensation product of soybean beta-amylase, but differed from that of G5 in E172A. When the substrate flips between Glc2 and Glc3, the conformational energy of the maltose unit was calculated to be 20 kcal/mol higher than that of the cis conformation by MM3. We suggest that beta-amylase destabilizes the bond that is to be broken in the ES complex, decreasing the activation energy, DeltaG(++), which is the difference in free energy between this state and the transition state.

About this Structure

1J18 is a Single protein structure of sequence from Bacillus cereus. Full crystallographic information is available from OCA.

Reference

Crystal structure of a catalytic site mutant of beta-amylase from Bacillus cereus var. mycoides cocrystallized with maltopentaose., Miyake H, Kurisu G, Kusunoki M, Nishimura S, Kitamura S, Nitta Y, Biochemistry. 2003 May 20;42(19):5574-81. PMID:12741813 Page seeded by OCA on Fri May 2 20:40:36 2008

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