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==Crystal Structure of Y29F mutant of Vitreoscilla hemoglobin== | |||
<StructureSection load='3tld' size='340' side='right' caption='[[3tld]], [[Resolution|resolution]] 1.90Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3tld]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_15218 Atcc 15218]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TLD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3TLD FirstGlance]. <br> | |||
==Function== | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2vhb|2vhb]], [[3tm3|3tm3]], [[3tm9|3tm9]]</td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">vhb ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=61 ATCC 15218])</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3tld FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tld OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3tld RCSB], [http://www.ebi.ac.uk/pdbsum/3tld PDBsum]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/BAHG_VITST BAHG_VITST]] This protein functions as a terminal oxidase. | [[http://www.uniprot.org/uniprot/BAHG_VITST BAHG_VITST]] This protein functions as a terminal oxidase. | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Site-directed mutants of the gene encoding wild-type Vitreoscilla hemoglobin were made that changed Tyr29 (B10) of the wild-type Vitreoscilla hemoglobin (VHb) to either Phe or Ala. The wild-type and the two mutant hemoglobins were expressed in Escherichia coli and purified to homogeneity. The binding of the two mutants to CO was essentially identical to that of wild-type VHb as determined by CO-difference spectra. Circular-dichroism spectra also showed the two mutants to be essentially the same as wild-type VHb regarding overall helicity. All three VHbs were crystallized and their structures were determined at resolutions of 1.7-1.9 A, which are similar to that of the original wild-type structure determination. The Tyr29Phe mutant has a structure that is essentially indistinguishable from that of the wild type. However, the structure of the Tyr29Ala mutant has significant differences from that of the wild type. In addition, for the Tyr29Ala mutant it was possible to determine the positions of most of the residues in the D region, which was disordered in the originally reported structure of wild-type VHb as well as in the wild-type VHb structure reported here. In the Tyr29Ala mutant, the five-membered ring of proline E8 (Pro54) occupies the space occupied by the aromatic ring of Tyr29 in the wild-type structure. These results are discussed in the context of the proposed role of Tyr29 in the structure of the oxygen-binding pocket. | |||
Crystallographic structure determination of B10 mutants of Vitreoscilla hemoglobin: role of Tyr29 (B10) in the structure of the ligand-binding site.,Ratakonda S, Anand A, Dikshit K, Stark BC, Howard AJ Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Mar 1;69(Pt 3):215-22., doi: 10.1107/S1744309112044818. Epub 2013 Feb 22. PMID:23519792<ref>PMID:23519792</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
[[Category: Anand, A | == References == | ||
[[Category: Dikshit, K | <references/> | ||
[[Category: Howard, A J | __TOC__ | ||
[[Category: Ratakonda, S | </StructureSection> | ||
[[Category: Stark, B C | [[Category: Atcc 15218]] | ||
[[Category: Anand, A]] | |||
[[Category: Dikshit, K]] | |||
[[Category: Howard, A J]] | |||
[[Category: Ratakonda, S]] | |||
[[Category: Stark, B C]] | |||
[[Category: Globin 8-helix fold]] | [[Category: Globin 8-helix fold]] | ||
[[Category: Oxygen storage]] | [[Category: Oxygen storage]] | ||
[[Category: Oxygen transport]] | [[Category: Oxygen transport]] | ||
Revision as of 16:36, 25 December 2014
Crystal Structure of Y29F mutant of Vitreoscilla hemoglobinCrystal Structure of Y29F mutant of Vitreoscilla hemoglobin
Structural highlights
Function[BAHG_VITST] This protein functions as a terminal oxidase. Publication Abstract from PubMedSite-directed mutants of the gene encoding wild-type Vitreoscilla hemoglobin were made that changed Tyr29 (B10) of the wild-type Vitreoscilla hemoglobin (VHb) to either Phe or Ala. The wild-type and the two mutant hemoglobins were expressed in Escherichia coli and purified to homogeneity. The binding of the two mutants to CO was essentially identical to that of wild-type VHb as determined by CO-difference spectra. Circular-dichroism spectra also showed the two mutants to be essentially the same as wild-type VHb regarding overall helicity. All three VHbs were crystallized and their structures were determined at resolutions of 1.7-1.9 A, which are similar to that of the original wild-type structure determination. The Tyr29Phe mutant has a structure that is essentially indistinguishable from that of the wild type. However, the structure of the Tyr29Ala mutant has significant differences from that of the wild type. In addition, for the Tyr29Ala mutant it was possible to determine the positions of most of the residues in the D region, which was disordered in the originally reported structure of wild-type VHb as well as in the wild-type VHb structure reported here. In the Tyr29Ala mutant, the five-membered ring of proline E8 (Pro54) occupies the space occupied by the aromatic ring of Tyr29 in the wild-type structure. These results are discussed in the context of the proposed role of Tyr29 in the structure of the oxygen-binding pocket. Crystallographic structure determination of B10 mutants of Vitreoscilla hemoglobin: role of Tyr29 (B10) in the structure of the ligand-binding site.,Ratakonda S, Anand A, Dikshit K, Stark BC, Howard AJ Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Mar 1;69(Pt 3):215-22., doi: 10.1107/S1744309112044818. Epub 2013 Feb 22. PMID:23519792[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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