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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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) |
| Item ID: | 37565 |
| Date Deposited: | 23 May 2006 |
| Last Modified: | 02 Mar 2012 13:50 |
| Contributors: | Bibby, T.S. (Author) Nield, J. (Author) Barber, J. (Author) |
| Date: | 16 August 2001 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/37565 |
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