5y8a: Difference between revisions
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==Periplasmic heme-binding protein BhuT in complex with two hemes (holo-2 form)== | |||
<StructureSection load='5y8a' size='340' side='right' caption='[[5y8a]], [[Resolution|resolution]] 2.00Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5y8a]] is a 2 chain structure. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=5gj1 5gj1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5Y8A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5Y8A FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</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">[[5giz|5giz]], [[5gj3|5gj3]]</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=5y8a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5y8a OCA], [http://pdbe.org/5y8a PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5y8a RCSB], [http://www.ebi.ac.uk/pdbsum/5y8a PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5y8a ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Periplasmic heme-binding proteins (PBPs) in Gram-negative bacteria are components of the heme acquisition system. These proteins shuttle heme across the periplasmic space from outer membrane receptors to ATP-binding cassette (ABC) heme importers located in the inner-membrane. In the present study, we characterized the structures of PBPs found in the pathogen Burkholderia cenocepacia (BhuT) and in the thermophile Roseiflexus sp. RS-1 (RhuT) in the heme-free and heme-bound forms. The conserved motif, in which a well-conserved Tyr interacts with the nearby Arg coordinates on heme iron, was observed in both PBPs. The heme was recognized by its surroundings in a variety of manners including hydrophobic interactions and hydrogen bonds, which was confirmed by isothermal titration calorimetry. Furthermore, this study of 3 forms of BhuT allowed the first structural comparison and showed that the heme-binding cleft of BhuT adopts an "open" state in the heme-free and 2-heme-bound forms, and a "closed" state in the one-heme-bound form with unique conformational changes. Such a conformational change might adjust the interaction of the heme(s) with the residues in PBP and facilitate the transfer of the heme into the translocation channel of the importer. | |||
Structural basis for binding and transfer of heme in bacterial heme-acquisition systems.,Naoe Y, Nakamura N, Rahman MM, Tosha T, Nagatoishi S, Tsumoto K, Shiro Y, Sugimoto H Proteins. 2017 Sep 14. doi: 10.1002/prot.25386. PMID:28913898<ref>PMID:28913898</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 5y8a" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Nakamura, N]] | |||
[[Category: Naoe, Y]] | |||
[[Category: Rahman, M M]] | |||
[[Category: Shiro, Y]] | |||
[[Category: Sugimoto, H]] | |||
[[Category: Metal transport]] | |||
[[Category: Transport protein]] | |||
Revision as of 06:42, 11 October 2017
Periplasmic heme-binding protein BhuT in complex with two hemes (holo-2 form)
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