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Literature DB >> 6977382

An x-ray absorption study of the iron site in bacterial photosynthetic reaction centers.

G Bunker, E A Stern, R E Blankenship, W W Parson.

Abstract

Measurements were made of the extended x-ray absorption fine structure (EXAFS) of the iron site in photosynthetic reaction centers from the bacterium Rhodopseudomonas sphaeroides. Forms with two quinones, two quinones with added o-phenanthroline, and one quinone were studied. Only the two forms containing two quinones maintained their integrity and were analyzed. The spectra show directly that the added o-phenanthroline does not chelate the iron atom. Further analysis indicates that the iron is octahedrally coordinated by nitrogen and/or oxygen atoms located at various distances, with the average value of about 2.14 A. The analysis suggests that most of the ligands are nitrogens and that three of the nitrogen ligands belong to histidine rings. This interpretation accounts for several unusual features of the EXAFS spectrum. We speculate that the quinones are bound to the histidine rings in some manner. Qualitative features of the absorption edge spectra also are discussed and are related to the Fe-ligand distance.

Entities: Chemical Species

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Year: 1982 PMID： 6977382 PMCID： PMC1328835 DOI： 10.1016/S0006-3495(82)84699-7

Source DB: PubMed Journal: Biophys J ISSN： 0006-3495 Impact factor: 4.033

13 in total

1. The analysis of materials by x-ray absorption.

Authors: E A Stern
Journal: Sci Am Date: 1976-04 Impact factor: 2.142

Review 2. The photochemical electron transfer reactions of photosynthetic bacteria and plants.

Authors: R E Blankenship; W W Parson
Journal: Annu Rev Biochem Date: 1978 Impact factor: 23.643

3. Kinetics of electron transfer between the primary and the secondary electron acceptor in reaction centers from Rhodopseudomonas sphaeroides.

Authors: A Vermeglio; R K Clayton
Journal: Biochim Biophys Acta Date: 1977-07-07

4. Observations and interpretation of x-ray absorption edges in iron compounds and proteins.

Authors: G R Shulman; Y Yafet; P Eisenberger; W E Blumberg
Journal: Proc Natl Acad Sci U S A Date: 1976-05 Impact factor: 11.205

5. Identification of ubiquinone as the secondary electron acceptor in the photosynthetic apparatus of Chromatium vinosum.

Authors: Y D Halsey; W W Parson
Journal: Biochim Biophys Acta Date: 1974-06-28

6. In Chromatium, a single photochemical reaction center oxidizes both cytochrome C552 and cytochrome C555.

Authors: W W Parson; G D Case
Journal: Biochim Biophys Acta Date: 1970

7. Preparation and properties of iron (III)-amino acid complexes. 2. The crystal and molecular structure of monoclinic. Tri-mu3-oxo-triaquohexakis(glycine)triiron(III) perchlorate.

Authors: R V Thundathil; E M Holt; S L Holt; K J Watson
Journal: J Am Chem Soc Date: 1977-03-16 Impact factor: 15.419

8. Primary acceptor in bacterial photosynthesis: obligatory role of ubiquinone in photoactive reaction centers of Rhodopseudomonas spheroides.

Authors: M Y Okamura; R A Isaacson; G Feher
Journal: Proc Natl Acad Sci U S A Date: 1975-09 Impact factor: 11.205

9. Preparation and properties of Fe 3+-amino acid complexes; Crystalline complexes with aliphatic amino acids.

Authors: W F Tucker; R O Asplund; S L Holt
Journal: Arch Biochem Biophys Date: 1975-02 Impact factor: 4.013

10. Photochemical electron transport oin photosynthetic reaction centers from Rhodopseudomonas spheroides. 3. Effects of orthophenanthroline and other chemicals.

Authors: R K Clayton; E Z Szuts; H Fleming
Journal: Biophys J Date: 1972-01 Impact factor: 4.033

15 in total

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2. Multiple scattering x-ray absorption studies of Zn2+ binding sites in bacterial photosynthetic reaction centers.

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Journal: Biophys J Date: 2004-12-21 Impact factor: 4.033

3. The active site structure of tetanus neurotoxin resolved by multiple scattering analysis in X-Ray absorption spectroscopy.

Authors: C Meneghini; S Morante
Journal: Biophys J Date: 1998-10 Impact factor: 4.033

4. Structure of the reaction center from Rhodobacter sphaeroides R-26: protein-cofactor (quinones and Fe2+) interactions.

Authors: J P Allen; G Feher; T O Yeates; H Komiya; D C Rees
Journal: Proc Natl Acad Sci U S A Date: 1988-11 Impact factor: 11.205

9. The fe2+ site of photosynthetic reaction centers probed by multiple scattering x-ray absorption fine structure spectroscopy: improving structure resolution in dry matrices.

Authors: Giulia Veronesi; Lisa Giachini; Francesco Francia; Antonia Mallardi; Gerardo Palazzo; Federico Boscherini; Giovanni Venturoli
Journal: Biophys J Date: 2008-05-02 Impact factor: 4.033

10. The electronic structure of Fe2+ in reaction centers from Rhodopseudomonas sphaeroides. II. Extended x-ray fine structure studies.

Authors: P Eisenberger; M Y Okamura; G Feher
Journal: Biophys J Date: 1982-02 Impact factor: 4.033