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Life 2014, 4(4), 903-914; doi:10.3390/life4040903

Consequences of Decreased Light Harvesting Capability on Photosystem II Function in Synechocystis sp. PCC 6803

1
Department of Biology, Washington University, St. Louis, MO 63130, USA
2
Terra Biologics, St. Louis, MO 63132, USA
*
Author to whom correspondence should be addressed.
Received: 21 October 2014 / Revised: 24 November 2014 / Accepted: 4 December 2014 / Published: 11 December 2014
(This article belongs to the Special Issue Cyanobacteria: Ecology, Physiology and Genetics)
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Abstract

Cyanobacteria use large pigment-protein complexes called phycobilisomes to harvest light energy primarily for photosystem II (PSII). We used a series of mutants with partial to complete reduction of phycobilisomes to examine the effects of antenna truncation on photosystem function in Synechocystis sp. PCC 6803. The antenna mutants CB, CK, and PAL expressed increasing levels of functional PSII centers to compensate for the loss of phycobilisomes, with a concomitant decrease in photosystem I (PSI). This increased PSII titer led to progressively higher oxygen evolution rates on a per chlorophyll basis. The mutants also exhibited impaired S-state transition profiles for oxygen evolution. Additionally, P700+ re-reduction rates were impacted by antenna reduction. Thus, a decrease in antenna size resulted in overall physiological changes in light harvesting and delivery to PSII as well as changes in downstream electron transfer to PSI. View Full-Text
Keywords: phycobilisome; antenna; photosynthesis; photosystem I; photosystem II; oxygen evolution phycobilisome; antenna; photosynthesis; photosystem I; photosystem II; oxygen evolution
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nagarajan, A.; Page, L.E.; Liberton, M.; Pakrasi, H.B. Consequences of Decreased Light Harvesting Capability on Photosystem II Function in Synechocystis sp. PCC 6803. Life 2014, 4, 903-914.

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