1bag: Difference between revisions

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[[Image:1bag.gif|left|200px]]


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==ALPHA-AMYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH MALTOPENTAOSE==
The line below this paragraph, containing "STRUCTURE_1bag", creates the "Structure Box" on the page.
<StructureSection load='1bag' size='340' side='right'caption='[[1bag]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1bag]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BAG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BAG FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5&#8491;</td></tr>
-->
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene></td></tr>
{{STRUCTURE_1bag|  PDB=1bag |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1bag FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bag OCA], [https://pdbe.org/1bag PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bag RCSB], [https://www.ebi.ac.uk/pdbsum/1bag PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bag ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/AMY_BACSU AMY_BACSU]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ba/1bag_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1bag ConSurf].
<div style="clear:both"></div>


'''ALPHA-AMYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH MALTOPENTAOSE'''
==See Also==
 
*[[Amylase 3D structures|Amylase 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
The X-ray crystal structure of a catalytic-site mutant EQ208 [Glu208--&gt;Gln] of alpha-amylase from Bacillus subtilis cocrystallized with maltopentaose (G5) and acarbose has been determined by multiple isomorphous replacement at 2.5 A resolution. Restrained crystallographic refinement has resulted in an R-factor of 19.8% in the 7.0 to 2.5 A resolution range. EQ208 consists of three domains containing a (beta/alpha)8-barrel as observed in other alpha-amylases. Clear connected density corresponding to a pentasaccharide was observed, which was considered as the G5 molecule based on the high affinity of EQ208 for G5 that could replace pre-bound acarbose or a possible transglycosylation product of acarbose. The conformation around the third alpha-(1,4)-glucosidic bond makes a sharp turn, allowing the substrate to fit into the L-shaped cleft. Aromatic residues build the walls of the substrate binding cleft and leucine residues form the inner curvature of the cleft. The amide nitrogen of Gln208 forms a hydrogen bond with the glucosidic oxygen in the scissile bond between Glc3 and Glc4 (Glc1 is the non-reducing end glucose residue of the substrate). This hydrogen-bonding manner may correspond to that of the protonated state of Glu208 in the initial kinetic complex between wild-type enzyme and substrate. The amide oxygen of Gln208 is anchored by two hydrogen bonds with Ala177 and a water molecule, assisting to make the amide proton point precisely to the place of the catalytic attack. The carboxyl oxygen atoms of the other catalytic-site residues Asp176 and Asp269 form hydrogen bonds with the oxygen atoms of Glc3. The carboxyl group of Asp176 has non-bonded contacts to the anomeric carbon atom and to the endocyclic oxygen atom of Glc3. These results suggest that Glu208 acts as a general acid and Asp176 as a general base. Glc3 forms seven hydrogen bonds with the surrounding protein groups and a stacking interaction with Tyr62, which is consistent with the fact that Glc3 has the lowest mean thermal factor of 13.2 A2 among the five sugar residues. Three calcium ions are found, one of which is positioned near the substrate binding site as found in other alpha-amylases and could contribute to stabilization of the structure of the active site.
 
==About this Structure==
1BAG is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BAG OCA].
 
==Reference==
Crystal structure of a catalytic-site mutant alpha-amylase from Bacillus subtilis complexed with maltopentaose., Fujimoto Z, Takase K, Doui N, Momma M, Matsumoto T, Mizuno H, J Mol Biol. 1998 Mar 27;277(2):393-407. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9514750 9514750]
[[Category: Alpha-amylase]]
[[Category: Bacillus subtilis]]
[[Category: Bacillus subtilis]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Doui, N.]]
[[Category: Doui N]]
[[Category: Fujimoto, Z.]]
[[Category: Fujimoto Z]]
[[Category: Mizuno, H.]]
[[Category: Mizuno H]]
[[Category: Takase, K.]]
[[Category: Takase K]]
[[Category: Alpha-amylase]]
[[Category: Bacillus subtili]]
[[Category: Catalytic-site mutant]]
[[Category: Maltopentaose]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 11:16:35 2008''

Latest revision as of 09:34, 7 February 2024

ALPHA-AMYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH MALTOPENTAOSEALPHA-AMYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH MALTOPENTAOSE

Structural highlights

1bag is a 1 chain structure with sequence from Bacillus subtilis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.5Å
Ligands:, ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

AMY_BACSU

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1bag, resolution 2.50Å

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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA
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