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[[Image:1uko.jpg|left|200px]]


{{Structure
==Crystal structure of soybean beta-amylase mutant substituted at surface region==
|PDB= 1uko |SIZE=350|CAPTION= <scene name='initialview01'>1uko</scene>, resolution 2.10&Aring;
<StructureSection load='1uko' size='340' side='right'caption='[[1uko]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
<table><tr><td colspan='2'>[[1uko]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Glycine_max Glycine max]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UKO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1UKO FirstGlance]. <br>
|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>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1uko FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1uko OCA], [https://pdbe.org/1uko PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1uko RCSB], [https://www.ebi.ac.uk/pdbsum/1uko PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1uko ProSAT]</span></td></tr>
|RELATEDENTRY=[[1bya|1BYA]], [[1byb|1BYB]], [[1byc|1BYC]], [[1byd|1BYD]], [[1bfn|1BFN]], [[1fa2|1FA2]], [[1ukp|1UKP]]
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1uko FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1uko OCA], [http://www.ebi.ac.uk/pdbsum/1uko PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1uko RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/AMYB_SOYBN AMYB_SOYBN]
== 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/uk/1uko_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=1uko ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In spite of the high similarity of amino acid sequence and three-dimensional structure between soybean beta-amylase (SBA) and sweet potato beta-amylase (SPB), their quaternary structure is quite different, being a monomer in SBA and a tetramer in SPB. Because most of the differences in amino acid sequences are found in the surface region, we tested the tetramerization of SBA by examining mutations of residues located at the surface. We designed the SBA tetramer using the SPB tetramer structure as a model and calculating the change of accessible surface area (DeltaASA) for each residue in order to select sites for the mutation. Two different mutant genes encoding SB3 (D374Y/L481R/P487D) and SB4 (K462S added to SB3), were constructed for expression in Escherichia coli and the recombinant proteins were purified. They existed as a monomer in solution, but gave completely different crystals from the native SBA. The asymmetric unit of the mutants contains four molecules, while that of native SBA contains one. The interactions of the created interfaces revealed that there were more intermolecular interactions in the SB3 than in the SB4 tetramer. The substituted charged residues on the surface are involved in interactions with adjacent molecules in a different way, forming a new crystal packing pattern.


'''Crystal structure of soybean beta-amylase mutant substituted at surface region'''
Change in the crystal packing of soybean beta-amylase mutants substituted at a few surface amino acid residues.,Kang YN, Adachi M, Mikami B, Utsumi S Protein Eng. 2003 Nov;16(11):809-17. PMID:14631070<ref>PMID:14631070</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1uko" style="background-color:#fffaf0;"></div>


==Overview==
==See Also==
In spite of the high similarity of amino acid sequence and three-dimensional structure between soybean beta-amylase (SBA) and sweet potato beta-amylase (SPB), their quaternary structure is quite different, being a monomer in SBA and a tetramer in SPB. Because most of the differences in amino acid sequences are found in the surface region, we tested the tetramerization of SBA by examining mutations of residues located at the surface. We designed the SBA tetramer using the SPB tetramer structure as a model and calculating the change of accessible surface area (DeltaASA) for each residue in order to select sites for the mutation. Two different mutant genes encoding SB3 (D374Y/L481R/P487D) and SB4 (K462S added to SB3), were constructed for expression in Escherichia coli and the recombinant proteins were purified. They existed as a monomer in solution, but gave completely different crystals from the native SBA. The asymmetric unit of the mutants contains four molecules, while that of native SBA contains one. The interactions of the created interfaces revealed that there were more intermolecular interactions in the SB3 than in the SB4 tetramer. The substituted charged residues on the surface are involved in interactions with adjacent molecules in a different way, forming a new crystal packing pattern.
*[[Amylase 3D structures|Amylase 3D structures]]
 
== References ==
==About this Structure==
<references/>
1UKO is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Glycine_max Glycine max]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UKO OCA].
__TOC__
 
</StructureSection>
==Reference==
Change in the crystal packing of soybean beta-amylase mutants substituted at a few surface amino acid residues., Kang YN, Adachi M, Mikami B, Utsumi S, Protein Eng. 2003 Nov;16(11):809-17. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14631070 14631070]
[[Category: Beta-amylase]]
[[Category: Glycine max]]
[[Category: Glycine max]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Adachi, M.]]
[[Category: Adachi M]]
[[Category: Kang, Y N.]]
[[Category: Kang YN]]
[[Category: Mikami, B.]]
[[Category: Mikami B]]
[[Category: Utsumi, S.]]
[[Category: Utsumi S]]
[[Category: (alpha/beta)8 barrel]]
 
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