Sll1783, a monooxygenase associated with polysaccharide processing in the unicellular cyanobacterium Synechocystis PCC 6803
Physiol Plant. 2017 Apr 21  [Epub ahead of print]
Miranda H, Immerzeel P, Gerber L, Hörnaeus K, Lind SB, Pattanaik B, Lindberg P, Mamedov F, Lindblad P

Abstract
Cyanobacteria play a pivotal role as the primary producer in many aquatic ecosystems. The knowledge on the interacting processes of cyanobacteria with its environment - abiotic and biotic factors - is still very limited. Many potential exocytoplasmic proteins in the model unicellular cyanobacterium Synechocystis PCC 6803 have unknown functions and their study is essential to improve our understanding of this photosynthetic organism and its potential for biotechnology use. Here we characterize a deletion mutant of Synechocystis PCC 6803, ∆sll1783, a strain that showed a remarkably high light resistance which is related with its lower thylakoid membrane formation. Our results also suggest that Sll1783 might be involved in a mechanism of polysaccharide degradation and uptake that we hypothesize it might function as a sensor for cell density in cyanobacterial cultures.

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