Heme ci or cn of the Cytochrome b6f Complex, A Short Retrospective

Chapter
Part of the Advances in Photosynthesis and Respiration book series (AIPH, volume 41)

Summary

The unexpected existence of heme ci (or cn) of cytochrome b6f complex was revealed to the scientific community in Spring 2003 at the Gordon Bioenergetics conference, taking place at Kimball Union Academy, NH, USA. The three-dimensional structures of the complex were published back-to-back by two independent groups in Fall 2003 (Kurisu et al. Science 302:1009–1014, 2003; Stroebel et al. Nature 426:413–418, 2003). Further information about the physico-chemical properties of this unusual heme was gathered in the following years. Here we shall re-examine early evidence for the presence of this unusual cytochrome, originally called G (Lavergne. Biochim Biophys Acta 725:25–33, 1983; Joliot and Joliot. Biochim Biophys Acta 933:319–333, 1988), which show the role that heme ci plays in electron transfer in the cytochrome b6f complex.

Abbreviation

bH

High-potential heme b

bL

Low-potential heme b

Cyt b6f

Cytochrome b6f complex

ECS

Electrochromic shift

Em

Midpoint redox potential

FNR

Ferredoxin-NADP+ reductase

LHC2

Light Harvesting Complex 2

NADP+

Nicotinamide adenine dinucleotide phosphate

NQNO

2-n-nonyl-4-hydroxyquinoline N-oxide

PSI

Photosystem I

PSII

Photosystem II

TMBZ

3,3′,5,5′-tetramethylbenzidine

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Institut Biologie Physico-Chimique, UMR7099, CNRS/Université Paris DiderotParisFrance
  2. 2.IBEB/SBVME/LB3M Bât 161 CEA de CadaracheCedexFrance

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