Zn, Cu and Co in cyanobacteria: selective control of metal availability

Jennifer S Cavet¹, Gilles P M Borrelly, Nigel J Robinson

¹Biosciences, Medical School, University of Newcastle, Newcastle NE2 4HH, UK.

|June 28, 2003

Abstract:

Homeostatic systems for essential and non-essential metals create the cellular environments in which the correct metals are acquired by metalloproteins while the incorrect ones are somehow avoided. Cyanobacteria have metal requirements often absent from other bacteria; copper in thylakoidal plastocyanin, zinc in carboxysomal carbonic anhydrase, cobalt in cobalamin but magnesium in chlorophyll, molybdenum in heterocystous nitrogenase, manganese in thylakoidal water-splitting oxygen-evolving complex. This article reviews: an intracellular trafficking pathway for inward copper supply, the sequestration of surplus zinc by metallothionein (also present in other bacteria) and the detection and export of excess cobalt. We consider the influence of homeostatic proteins on selective metal availability.

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Abstract:

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