Loss of the SPHF homologue Slr1768 leads to a catastrophic failure in the maintenance of thylakoid membranes in synechocystis sp. PCC 6803
Bryan, Samantha J., Burroughs, Nigel John, Evered, Carol, Sacharz, Joanna, Nenninger, Anja, Mullineaux, Conrad W. and Spence, Edward M.. (2011) Loss of the SPHF homologue Slr1768 leads to a catastrophic failure in the maintenance of thylakoid membranes in synechocystis sp. PCC 6803. PLoS One, Vol.6 (No.5). e19625. ISSN 1932-6203
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Official URL: http://dx.doi.org/10.1371/journal.pone.0019625
Background: In cyanobacteria the photosystems are localised to, and maintained in, specialist membranes called the thylakoids. The mechanism driving the biogenesis of the thylakoid membranes is still an open question, with only two potential biogenesis factors, Vipp1 and Alb3 currently identified.
Methodology/Principal Findings: We generated a slr1768 knockout using the pGEM T-easy vector and REDIRECT. By comparing growth and pigment content (chlorophyll a fluoresence) of the Delta slr1768 mutant with the wild-type, we found that Dslr1768 has a conditional phenotype; specifically under high light conditions (130 mu mol m(-2) s(-1)) thylakoid biogenesis is disrupted leading to cell death on a scale of days. The thylakoids show considerable disruption, with loss of both structure and density, while chlorophyll a density decreases with the loss of thylakoids, although photosynthetic efficiency is unaffected. Under low light (30 mu mol m(-2) s(-1)) the phenotype is significantly reduced, with a growth rate similar to the wildtype and only a low frequency of cells with evident thylakoid disruption.
Conclusions/Significance: This is the first example of a gene that affects the maintenance of the thylakoid membranes specifically under high light, and which displays a phenotype dependent on light intensity. Our results demonstrate that Slr1768 has a leading role in acclimatisation, linking light damage with maintenance of the thylakoids.
|Item Type:||Journal Article|
|Subjects:||Q Science > QR Microbiology|
|Divisions:||Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)
Faculty of Science > Life Sciences (2010- )
Faculty of Science > Centre for Systems Biology
Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
|Library of Congress Subject Headings (LCSH):||Cyanobacteria -- Physiology, Thylakoids, Chloroplasts -- Formation, Cyanobacteria -- Genetics, Bacterial cell walls|
|Journal or Publication Title:||PLoS One|
|Publisher:||Public Library of Science|
|Official Date:||23 May 2011|
|Access rights to Published version:||Open Access|
|Funder:||University of Warwick, Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC)|
|Grant number:||BB/G021856/1 (BBSRC)|
1. Stanier RY, Cohen-Bazire G (1977) Phototrophic prokaryotes: the cyanobacteria.
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