1cxy

<table><tr><td colspan='2'>[[1cxy]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"autotrophic_rhodopseudomonas_spec."_kondrat'eva_1956 "autotrophic rhodopseudomonas spec." kondrat'eva 1956]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CXY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CXY FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr>

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== Publication Abstract from PubMed ==

A soluble cytochrome b(558) from the purple phototropic bacterium Ectothiorhodospira vacuolata was completely sequenced by a combination of automated Edman degradation and mass spectrometry. The protein, with a measured mass of 10,094.7 Da, contains 90 residues and binds a single protoheme. Unexpectedly, the sequence shows homology to eukaryotic cytochromes b(5). As no prokaryotic homologue had been reported so far, we developed a protocol for the expression, purification, and crystallization of recombinant cytochrome b(558). The structure was solved by molecular replacement to a resolution of 1.65 A. It shows that cytochrome b(558) is indeed the first bacterial cytochrome b(5) to be characterized and differs from its eukaryotic counterparts by the presence of a disulfide bridge and a four-residue insertion in front of the sixth ligand (histidine). Eukaryotes contain a variety of b(5) homologues, including soluble and membrane-bound multifunctional proteins as well as multidomain enzymes such as sulfite oxidase, fatty-acid desaturase, nitrate reductase, and lactate dehydrogenase. A search of the Mycobacterium tuberculosis genome showed that a previously unidentified gene encodes a fatty-acid desaturase with an N-terminal b(5) domain. Thus, it may provide another example of a bacterial b(5) homologue.

Structure and characterization of Ectothiorhodospira vacuolata cytochrome b(558), a prokaryotic homologue of cytochrome b(5).,Kostanjevecki V, Leys D, Van Driessche G, Meyer TE, Cusanovich MA, Fischer U, Guisez Y, Van Beeumen J J Biol Chem. 1999 Dec 10;274(50):35614-20. PMID:10585439<ref>PMID:10585439</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Autotrophic rhodopseudomonas spec. kondrat'eva 1956]]

[[Category: Cusanovich, M A]]

[[Category: Driessche, G Van]]

[[Category: Fischer, U]]

[[Category: Guisez, Y]]

[[Category: Kostanjevecki, V]]

[[Category: Leys, D]]

[[Category: Meyer, T E]]

[[Category: Beta-strand]]

[[Category: Electron transport]]

[[Category: Helix]]