Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
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Target Concepts:
Gene/Protein
Disease
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Query: UMLS:C1832526 (
PCC
)
5,967
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Many cyanobacteria, which use light as an energy source via photosynthesis, have evolved the ability to guide their movement toward or away from a light source. This process, termed "phototaxis," enables organisms to localize in optimal light environments for improved growth and fitness. Mechanisms of phototaxis have been studied in the coccoid cyanobacterium
Synechocystis
sp. strain
PCC
6803, but the rod-shaped
Synechococcus elongatus
PCC
7942, studied for circadian rhythms and metabolic engineering, has no phototactic motility. In this study we report a recent environmental isolate of
S. elongatus
, the strain UTEX 3055, whose genome is 98.5% identical to that of
PCC
7942 but which is motile and phototactic. A six-gene operon encoding chemotaxis-like proteins was confirmed to be involved in phototaxis. Environmental light signals are perceived by a cyanobacteriochrome, PixJ
Se
(Synpcc7942_0858), which carries five
GAF
domains that are responsive to blue/green light and resemble those of PixJ from
Synechocystis
Plate-based phototaxis assays indicate that UTEX 3055 uses PixJ
Se
to sense blue and green light. Mutation of conserved functional cysteine residues in different
GAF
domains indicates that PixJ
Se
controls both positive and negative phototaxis, in contrast to the multiple proteins that are employed for implementing bidirectional phototaxis in
Synechocystis
.
...
PMID:Phototaxis in a wild isolate of the cyanobacterium
Synechococcus elongatus
. 3055 39
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