The evolution of far-red light perception in Acaryochloris Marina, a chlorophyll d-containing cyanobacterium

Zane Duxbury, Robert D. Willows, Penelope M. Smith, Min Chen*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)

Abstract

Phytochromes are photoreceptors that were first discovered in plants, but homologues have since been identified in bacteria, cyanobacteria and fungi. Phytochromes reversibly isomerise upon illumination in red or far-red light, making them uniquely adapted to regulating antenna pigments and photosystems in photosynthetic organisms. Acaryochloris marina, a unicellular oxygenic photosynthetic cyanobacterium, lives in infrared light enriched environments. It has adapted to these light conditions by evolving a red-shifted chlorophyll, chlorophyll d. Since A. marina has adapted to infrared light enriched light conditions, phytochrome may be an important photoreceptor for this organism. To understand red light perception in A. marina, the newly sequenced genome of this cyanobacterium was searched for phytochrome homologues. Interestingly, A. marina contains a gene for a putative red-shifted phytochrome, denoted AmrBphP. AmrBphP was included in a phylogenetic analysis of the phytochrome superfamily and found to be more closely related to bacteriophytochromes than typical cyanobacterial phytochromes. The red-shifted absorption spectrum of a bacteriophytochrome would better overlap the spectrum of Chl d then the spectrum of a cyanobacterial phytochrome. A. marina may have evolved or retained a bacteriophytochrome to adapt to the infra red light-enriched environment it inhabits.

Original languageEnglish
Title of host publicationPhotosynthesis research for food, fuel and the future
Subtitle of host publication15th International Conference on Photosynthesis
EditorsTingyun Kuang, Congming Lu, Lixin Zhang
Place of PublicationBerlin, Heidelberg
PublisherSpringer
Pages638-641
Number of pages4
ISBN (Electronic)9783642320347
ISBN (Print)9783642320330, 9787308096942
DOIs
Publication statusPublished - Jan 2013
EventInternational Conference on Photosynthesis (15th : 2010) - Beijing, China
Duration: 22 Aug 201027 Aug 2010

Publication series

NameAdvanced Topics in Science and Technology in China
PublisherSpringer
ISSN (Print)1995-6819
ISSN (Electronic)1995-6827

Conference

ConferenceInternational Conference on Photosynthesis (15th : 2010)
CountryChina
CityBeijing
Period22/08/1027/08/10

Keywords

  • bacteriophytochrome
  • chromophore
  • cyanobacteria
  • photoreceptor
  • chlorophyll d

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