1ctm: Difference between revisions
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< | ==CRYSTAL STRUCTURE OF CHLOROPLAST CYTOCHROME F REVEALS A NOVEL CYTOCHROME FOLD AND UNEXPECTED HEME LIGATION== | ||
<StructureSection load='1ctm' size='340' side='right'caption='[[1ctm]], [[Resolution|resolution]] 2.30Å' scene=''> | |||
You may | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1ctm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Brassica_rapa Brassica rapa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CTM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CTM 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]] 2.3Å</td></tr> | |||
-- | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEC:HEME+C'>HEC</scene></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=1ctm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ctm OCA], [https://pdbe.org/1ctm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ctm RCSB], [https://www.ebi.ac.uk/pdbsum/1ctm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ctm ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/CYF_BRARR CYF_BRARR] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. | |||
== 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/ct/1ctm_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1ctm ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
BACKGROUND: Cytochrome f is the high potential electron acceptor of the chloroplast cytochrome b6f complex, and is the electron donor to plastocyanin. The 285-residue cytochrome f subunit is anchored in the thylakoid membrane of the chloroplast by a single membrane-spanning segment near the carboxyl terminus. A soluble redox-active 252-residue lumen-side polypeptide with native spectroscopic and redox properties, missing the membrane anchor and carboxyl terminus, was purified from turnip chloroplasts for structural studies. RESULTS: The crystal structure of cytochrome f, determined to 2.3 A resolution, has several unexpected features. The 252-residue polypeptide is organized into one large and one small domain. The larger heme-binding domain is strikingly different from known structures of other c-type cytochromes and has the same fold as the type III domain of the animal protein, fibronectin. Cytochrome f binds heme with an unprecedented axial heme iron ligand: the amino terminus of the polypeptide. CONCLUSION: The first atomic structure of a subunit of either the cytochrome b6f complex or of the related cytochrome bc1 complex has been obtained. The structure of cytochrome f allows prediction of the approximate docking site of plastocyanin and should allow systematic studies of the mechanism of intra- and inter-protein electron transfer between the cytochrome heme and plastocyanin copper, which are approximately isopotential. The unprecedented axial heme iron ligand also provides information on the sequence of events (i.e. cleavage of signal peptide and ligation of heme) associated with translocation of the cytochrome across the membrane and its subsequent folding. | |||
Crystal structure of chloroplast cytochrome f reveals a novel cytochrome fold and unexpected heme ligation.,Martinez SE, Huang D, Szczepaniak A, Cramer WA, Smith JL Structure. 1994 Feb 15;2(2):95-105. PMID:8081747<ref>PMID:8081747</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1ctm" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Cytochrome f|Cytochrome f]] | |||
*[[Cytochrome f 3D structures|Cytochrome f 3D structures]] | |||
*[[Hemeproteins|Hemeproteins]] | |||
== References == | |||
<references/> | |||
== | __TOC__ | ||
</StructureSection> | |||
[[Category: Brassica rapa]] | |||
== | [[Category: Large Structures]] | ||
[[Category: Cramer WA]] | |||
[[Category: Brassica rapa | [[Category: Huang D]] | ||
[[Category: | [[Category: Martinez SE]] | ||
[[Category: Cramer | [[Category: Smith JL]] | ||
[[Category: Huang | [[Category: Szczepaniak A]] | ||
[[Category: Martinez | |||
[[Category: Smith | |||
[[Category: Szczepaniak | |||
Latest revision as of 07:26, 17 October 2024
CRYSTAL STRUCTURE OF CHLOROPLAST CYTOCHROME F REVEALS A NOVEL CYTOCHROME FOLD AND UNEXPECTED HEME LIGATIONCRYSTAL STRUCTURE OF CHLOROPLAST CYTOCHROME F REVEALS A NOVEL CYTOCHROME FOLD AND UNEXPECTED HEME LIGATION
Structural highlights
FunctionCYF_BRARR Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBACKGROUND: Cytochrome f is the high potential electron acceptor of the chloroplast cytochrome b6f complex, and is the electron donor to plastocyanin. The 285-residue cytochrome f subunit is anchored in the thylakoid membrane of the chloroplast by a single membrane-spanning segment near the carboxyl terminus. A soluble redox-active 252-residue lumen-side polypeptide with native spectroscopic and redox properties, missing the membrane anchor and carboxyl terminus, was purified from turnip chloroplasts for structural studies. RESULTS: The crystal structure of cytochrome f, determined to 2.3 A resolution, has several unexpected features. The 252-residue polypeptide is organized into one large and one small domain. The larger heme-binding domain is strikingly different from known structures of other c-type cytochromes and has the same fold as the type III domain of the animal protein, fibronectin. Cytochrome f binds heme with an unprecedented axial heme iron ligand: the amino terminus of the polypeptide. CONCLUSION: The first atomic structure of a subunit of either the cytochrome b6f complex or of the related cytochrome bc1 complex has been obtained. The structure of cytochrome f allows prediction of the approximate docking site of plastocyanin and should allow systematic studies of the mechanism of intra- and inter-protein electron transfer between the cytochrome heme and plastocyanin copper, which are approximately isopotential. The unprecedented axial heme iron ligand also provides information on the sequence of events (i.e. cleavage of signal peptide and ligation of heme) associated with translocation of the cytochrome across the membrane and its subsequent folding. Crystal structure of chloroplast cytochrome f reveals a novel cytochrome fold and unexpected heme ligation.,Martinez SE, Huang D, Szczepaniak A, Cramer WA, Smith JL Structure. 1994 Feb 15;2(2):95-105. PMID:8081747[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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