Reconstitution of the peridinin-chlorophyll a protein (PCP): evidence for functional flexibility in chlorophyll binding

David J. Miller, Julian Catmull, Robert Puskeiler, Helen Tweedale, Frank P. Sharples, Roger G. Hiller

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

The coding regions for the N-domain, and full length peridinin-chlorophyll a apoprotein (full length PCP), were expressed in Escherichia coli. The apoproteins formed inclusion bodies from which the peptides could be released by hot buffer. Both the above constructs were reconstituted by addition of a total pigment extract from native PCP. After purification by ion exchange chromatography, the absorbance, fluorescence excitation and CD spectra resembled those of the native PCP. Energy transfer from peridinin to Chl a was restored and a specific fluorescence activity calculated which was ∼86% of that of native PCP. Size exclusion analysis and CD spectra showed that the N-domain PCP dimerized on reconstitution. Chl a could be replaced by Chl b, 3-acetyl Chl a, Chl d and Bchl using the N-domain apo protein. The specific fluorescence activity was the same for constructs with Chl a, 3-acetyl Chl a, and Chl d but significantly reduced for those made with Chl b. Reconstitutions with mixtures of chlorophylls were also made with eg Chl b and Chl d and energy transfer from the higher energy Qy band to the lower was demonstrated.

Original languageEnglish
Pages (from-to)229-240
Number of pages12
JournalPhotosynthesis Research
Volume86
Issue number1-2
DOIs
Publication statusPublished - Nov 2005

Keywords

  • chlorophylls
  • circular dichroism
  • energy transfer
  • fluorescence excitation
  • peridinin
  • protein reconstitution

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