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1j12
From Proteopedia
(New page: 200px<br /><applet load="1j12" size="450" color="white" frame="true" align="right" spinBox="true" caption="1j12, resolution 2.1Å" /> '''Beta-Amylase from Bac...) |
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| - | [[Image:1j12.gif|left|200px]]<br /><applet load="1j12" size=" | + | [[Image:1j12.gif|left|200px]]<br /><applet load="1j12" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1j12, resolution 2.1Å" /> | caption="1j12, resolution 2.1Å" /> | ||
'''Beta-Amylase from Bacillus cereus var. mycoides in Complex with alpha-EBG'''<br /> | '''Beta-Amylase from Bacillus cereus var. mycoides in Complex with alpha-EBG'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structures of beta-amylase from Bacillus cereus var. mycoides | + | The crystal structures of beta-amylase from Bacillus cereus var. mycoides in complexes with five inhibitors were solved. The inhibitors used were three substrate analogs, i.e. glucose, maltose (product), and a synthesized compound, O-alpha-D-glucopyranosyl-(1-->4)-O-alpha-D-glucopyranosyl-(1-->4)-D-xylopy ranose (GGX), and two affinity-labeling reagents with an epoxy alkyl group at the reducing end of glucose. For all inhibitors, one molecule was bound at the active site cleft and the non-reducing end glucose of the four inhibitors except GGX was located at subsite 1, accompanied by a large conformational change of the flexible loop (residues 93-97), which covered the bound inhibitor. In addition, another molecule of maltose or GGX was bound about 30 A away from the active site. A large movement of residues 330 and 331 around subsite 3 was also observed upon the binding of GGX at subsites 3 to 5. Two affinity-labeling reagents, alpha-EPG and alpha-EBG, were covalently bound to a catalytic residue (Glu-172). A substrate recognition mechanism for the beta-amylase was discussed based on the modes of binding of these inhibitors in the active site cleft. |
==About this Structure== | ==About this Structure== | ||
| - | 1J12 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_cereus Bacillus cereus] with EBG and CA as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http:// | + | 1J12 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_cereus Bacillus cereus] with <scene name='pdbligand=EBG:'>EBG</scene> and <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1J12 OCA]. |
==Reference== | ==Reference== | ||
| - | Crystal structures of beta-amylase from Bacillus cereus var mycoides in complexes with substrate analogs and affinity-labeling reagents., Oyama T, Miyake H, Kusunoki M, Nitta Y, J Biochem | + | Crystal structures of beta-amylase from Bacillus cereus var mycoides in complexes with substrate analogs and affinity-labeling reagents., Oyama T, Miyake H, Kusunoki M, Nitta Y, J Biochem. 2003 Apr;133(4):467-74. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12761294 12761294] |
[[Category: Bacillus cereus]] | [[Category: Bacillus cereus]] | ||
[[Category: Beta-amylase]] | [[Category: Beta-amylase]] | ||
| Line 24: | Line 24: | ||
[[Category: raw-starch binding domain]] | [[Category: raw-starch binding domain]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:17:49 2008'' |
Revision as of 11:17, 21 February 2008
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Beta-Amylase from Bacillus cereus var. mycoides in Complex with alpha-EBG
Overview
The crystal structures of beta-amylase from Bacillus cereus var. mycoides in complexes with five inhibitors were solved. The inhibitors used were three substrate analogs, i.e. glucose, maltose (product), and a synthesized compound, O-alpha-D-glucopyranosyl-(1-->4)-O-alpha-D-glucopyranosyl-(1-->4)-D-xylopy ranose (GGX), and two affinity-labeling reagents with an epoxy alkyl group at the reducing end of glucose. For all inhibitors, one molecule was bound at the active site cleft and the non-reducing end glucose of the four inhibitors except GGX was located at subsite 1, accompanied by a large conformational change of the flexible loop (residues 93-97), which covered the bound inhibitor. In addition, another molecule of maltose or GGX was bound about 30 A away from the active site. A large movement of residues 330 and 331 around subsite 3 was also observed upon the binding of GGX at subsites 3 to 5. Two affinity-labeling reagents, alpha-EPG and alpha-EBG, were covalently bound to a catalytic residue (Glu-172). A substrate recognition mechanism for the beta-amylase was discussed based on the modes of binding of these inhibitors in the active site cleft.
About this Structure
1J12 is a Single protein structure of sequence from Bacillus cereus with and as ligands. Active as Beta-amylase, with EC number 3.2.1.2 Full crystallographic information is available from OCA.
Reference
Crystal structures of beta-amylase from Bacillus cereus var mycoides in complexes with substrate analogs and affinity-labeling reagents., Oyama T, Miyake H, Kusunoki M, Nitta Y, J Biochem. 2003 Apr;133(4):467-74. PMID:12761294
Page seeded by OCA on Thu Feb 21 13:17:49 2008
