Letter to Nature. Iron deficiency induces the formation of an antenna ring around trimeric photosystem I in cyanobacteria.


Bibby, T.S., Nield, J. and Barber, J. (2001) Letter to Nature. Iron deficiency induces the formation of an antenna ring around trimeric photosystem I in cyanobacteria. Nature, 412, (6848), 743-745. (doi:10.1038/35089098).

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Original Publication URL: http://dx.doi.org/10.1038/35089098

Description/Abstract

Although iron is the fourth most abundant element in the Earth's crust, its concentration in the aquatic ecosystems-particularly the open oceans-is sufficiently low to limit photosynthetic activity and phytoplankton growth. Cyanobacteria, a major class of phytoplankton, respond to iron deficiency by expressing the 'iron-stress-induced' gene, isiA(ref. 3). The protein encoded by this gene has an amino-acid sequence that shows significant homology with one of the chlorophyll a-binding proteins (CP43) of photosystem II (PSII). The precise function of the CP43-like protein, here called CP43', has not been elucidated, although there have been many suggestions. Here we show that CP43' associates with photosystem I (PSI) to form a complex that consists of a ring of 18 CP43' molecules around a PSI trimer. This significantly increases the size of the light-harvesting system of PSI. The utilization of a PSII-like protein as an extra antenna for PSI emphasises the flexibility of cyanobacterial light-harvesting systems, and seems to be a strategy which compensates for the lowering of phycobilisome and PSI levels in response to iron deficiency

Item Type: Article
ISSNs: 0028-0836 (print)
Related URLs:
Subjects: Q Science > QR Microbiology
Divisions: University Structure - Pre August 2011 > National Oceanography Centre (NERC)
ePrint ID: 37565
Date Deposited: 23 May 2006
Last Modified: 27 Mar 2014 18:23
URI: http://eprints.soton.ac.uk/id/eprint/37565

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