An X-ray absorption study of chemically modified bacterial photosynthetic reaction centers

Lin X. Chen*, Zhiyu Wang, Gerhard Hartwich, Ingrid Katheder, Hugo Scheer, Avigdor Scherz, Pedro A. Montano, James R. Norris

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Local structures around metal atoms in Ni and Zn substituted 132-hydroxy-bacteriochlorophyll a (Ni-HOB, and Zn-HOB) with and without insertion into the accessory bacteriochlorophyll a (BChla) sites in Rhodobacter sphaeroides photosynthetic reaction centers (RC) are studied using X-ray absorption spectroscopy. The penta-coordination of Ni-HOB and Zn-HOB in the RC is similar to that of BChl a in native RC, where the fifth ligand is from a nearby histidine residue. Average NiN and ZnN distances increase by 0.08 Å in Ni-HOB and decrease by 0.04 Å in Zn-HOB-Et2O as the modified chlorophylls bind with the RC due to the interaction between the protein and the macrocycle.

Original languageEnglish (US)
Pages (from-to)437-444
Number of pages8
JournalChemical Physics Letters
Volume234
Issue number4-6
DOIs
StatePublished - Mar 10 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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