3s5c: Difference between revisions
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==Crystal Structure of a Hexachlorocyclohexane dehydrochlorinase (LinA) Type2== | |||
<StructureSection load='3s5c' size='340' side='right'caption='[[3s5c]], [[Resolution|resolution]] 3.50Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3s5c]] is a 7 chain structure with sequence from [https://en.wikipedia.org/wiki/Uncultured_organism Uncultured organism]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3S5C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3S5C FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.5Å</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3s5c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3s5c OCA], [https://pdbe.org/3s5c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3s5c RCSB], [https://www.ebi.ac.uk/pdbsum/3s5c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3s5c ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/B5ANU3_9ZZZZ B5ANU3_9ZZZZ] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Hexachlorocyclohexane dehydrochlorinase (LinA) mediates dehydrochlorination of gamma-HCH to 1, 3, 4, 6-tetrachloro-1,4-cyclohexadiene that constitutes first step of the aerobic degradation pathway. We report the 3.5 A crystal structure of a thermostable LinA-type2 protein, obtained from a soil metagenome, in the hexagonal space group P6(3)22 with unit cell parameters a = b = 162.5, c = 186.3 A, respectively. The structure was solved by molecular replacement using the co-ordinates of LinA-type1 that exhibits mesophile-like properties. Structural comparison of LinA-type2 and -type1 proteins suggests that thermostability of LinA-type2 might partly arise due to presence of higher number of ionic interactions, along with 4% increase in the intersubunit buried surface area. Mutational analysis involving the differing residues between the -type1 and -type2 proteins, circular dichroism experiments and functional assays suggest that Q20 and G23 are determinants of stability for LinA-type2. It was earlier reported that LinA-type1 exhibits enantioselectivity for the (-) enantiomer of alpha-HCH. Contrastingly, we identified that -type2 protein prefers the (+) enantiomer of alpha-HCH. Structural analysis and molecular docking experiments suggest that changed residues K20Q, L96C and A131G, vicinal to the active site are probably responsible for the altered enantioselectivity of LinA-type2. Overall the study has identified features responsible for the thermostability and enantioselectivity of LinA-type2 that can be exploited for the design of variants for specific biotechnological applications. | |||
Crystal structure of the hexachlorocyclohexane dehydrochlorinase (LinA-type2): mutational analysis, thermostability and enantioselectivity.,Macwan AS, Kukshal V, Srivastava N, Javed S, Kumar A, Ramachandran R PLoS One. 2012;7(11):e50373. doi: 10.1371/journal.pone.0050373. Epub 2012 Nov 27. PMID:23209726<ref>PMID:23209726</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 3s5c" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Uncultured organism]] | |||
[[Category: Kukshal V]] | |||
[[Category: Kumar A]] | |||
[[Category: Macwan AS]] | |||
[[Category: Ramachandran R]] | |||
Latest revision as of 17:22, 1 November 2023
Crystal Structure of a Hexachlorocyclohexane dehydrochlorinase (LinA) Type2
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