High-light stress and the one-helix LHC-like proteins of the cryptophyte Guillardia theta

Funk, Christiane (author): Umeå universitet,Kemiska institutionen,Botany Department, University of British Columbia, Vancouver, BC, Canada

Alami, Meriem (author): Botany Department, University of British Columbia, Vancouver, BC, Canada

Tibiletti, Tania, 1984- (author): Umeå universitet,Kemiska institutionen,Christiane Funk

Green, Beverley R (author): Botany Department, University of British Columbia, Vancouver, BC, Canada

(creator_code:org_t)

Elsevier BV, 2011
2011
English.
In: Biochimica et Biophysica Acta - Bioenergetics. - : Elsevier BV. - 0005-2728 .- 1879-2650. ; 1807:7, s. 841-846

Related links:: https://doi.org/10.1...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Cryptophytes like the cryptomonad Guillardia theta are part of the marine phytoplankton and therefore major players in global carbon and biogeochemical cycles. Despite the importance for the cell in being able to cope with large changes in illumination on a daily basis, very little is known about photoprotection mechanisms in cryptophytes. Here we show that G. theta is able to perform non-photochemical quenching, although none of the usual xanthophyll cycle pigments (e.g. zeaxanthin, diadinoxanthin, diatoxanthin) are present at detectable levels. Instead, acclimation to high light intensity seems to involve an increase of alloxanthin. G. theta has genes for two one-helix "light-harvesting-like" proteins, related to some cyanobacterial genes which are induced in response to high light stress. Both the plastid-encoded gene (hlipP) and the nucleomorph-encoded gene (HlipNm) are expressed, but transcript levels decrease rather than increase during high light exposure, suggesting they are not involved in a high light stress response. The HlipNm protein was detected with a specific antibody; expression was constant, independent of the light exposure.

By the author/editor: Funk, Christiane; Alami, Meriem; Tibiletti, Tania ...; Green, Beverley ...

About the subject

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