Crystal structure at 1.5 Å resolution of the PsbV2 cytochrome from the cyanobacterium Thermosynechococcus elongatus

Michihiro Suga, Thanh Lan Lai, Miwa Sugiura, Jian Ren Shen, Alain Boussac

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

PsbV2 is a c-type cytochrome present in a very low abundance in the thermophilic cyanobacterium Thermosynechococcus elongatus. We purified this cytochrome and solved its crystal structure at a resolution of 1.5 Å. The protein existed as a dimer in the crystal, and has an overall structure similar to other c-type cytochromes like Cytc6 and Cytc550, for example. However, the 5th and 6th heme iron axial ligands were found to be His51 and Cys101, respectively, in contrast to the more common bis-His or His/Met ligands found in most cytochromes. Although a few other c-type cytochromes were suggested to have this axial coordination, this is the first crystal structure reported for a c-type heme with this unusual His/Cys axial coordination. Previous spectroscopic characterizations of PsbV2 are discussed in relation to its structural properties.

Original languageEnglish
Pages (from-to)3267-3272
Number of pages6
JournalFEBS Letters
Volume587
Issue number19
DOIs
Publication statusPublished - Oct 1 2013

Keywords

  • Crystal structure
  • Cyanobacteria
  • Cytochrome c
  • His/Cys coordination
  • PsbV2

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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