The marine picoplankter Synechococcus sp. WH 7803 exhibits an adaptive response to restricted iron availability |
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| Authors: | Helen E. Chadd Ian R. Joint Nicholas H. Mann Noel G. Carr |
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| Affiliation: | Department of Biological Sciences, The University of Warwick, Coventry CV4 7AL, UK;Natural Environmental Research Council, Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK |
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| Abstract: | Abstract: Laboratory cultures of marine Synechococcus sp. WH 7803 were grown under conditions of restricted iron availability. The culture medium was adjusted to restrict iron availability: (i) by adding the iron chelator EDDA; (ii) by omitting iron; and (iii) by omitting both iron and EDTA. An adaptive response was observed to these iron-restricted conditions, including a decrease in cellular phycoerythrin and synthesis of a 36 kDa polypeptide in [35S]methionine radiolabelled whole cell lysates separated by SDS-PAGE. The polypeptide was synthesized within 48 h of transferring exponential phase cells to the iron-restricted medium. The protein was localized to the cell membranes and not the cytoplasmic fraction. |
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| Keywords: | Cyanobacterium Synechococcus Iron Marine Picoplankton Phycoerythrin |
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