Biology Reference
In-Depth Information
ackA/pgam was suggested as evidence for a substrate-level phosphorylation
under iron-limiting conditions via acetyl phosphate to acetate conversion,
but the experimental proof for such pathway is still missing.
A third iron-regulated gene, idiC, is positioned upstream of idiA and
idiB in
S. elongatus
PCC 7942 (
Pietsch, Staiger, Pistorius, & Michel, 2007
).
IdiC is a member of the thioredoxin-like ferredoxin family and was sug-
gested to function in protecting the photosynthetic activity in a man-
ner similar to NuoE, a peripheral subunit of the
E. coli
NDH-1 complex
(
Pietsch et al., 2007
). However, as seen for IsiB, the function of IdiC is not
restricted to iron starvation response as the gene is essential. The latter is
in agreement with the recent observation that
idiC
expression is enhanced
during stationary phase (
Pietsch et al., 2011
). Based on these results, it was
suggested that IdiC might function in the electron transport process from
NAD(P)H to plastoquinone (
Pietsch et al., 2011
). Thus, IdiC is most likely
a factor involved in the global regulation of photosynthesis.
ACKNOWLEDGEMENTS
We thank Oliver Mirus for help during figure preparation. Financial support from the
Deutsche Forschungsgemeinschaft (DFG) to E.S. and from the Israeli Science Foundation
(grant no. 806/11) to N.K. is acknowledged.
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