| Abstrakt: |
When cells of Synechococcus PCC7942 were subjected to either iron or magnesium limitation, there was an appearance of specific proteins in the outer membrane (isolated as the cell wall fraction). Under iron limitation outer membrane polypeptides of Mr 92000, 48000–50000 and 35000 appeared. Specific iron-limited outer membrane proteins (IRMPs) of Mr 52000 and 36000 were also induced in iron-limited cultures of Synechocystis PCC6308. Under magnesium limitation polypeptides of Mr 80000, 67000, 62000, 50000, 28000 and 25000 appeared in the outer membrane. phosphate limitation caused minor changes in the outer membrane protein pattern, with polypeptides of Mr 32000 and one of over 100000 being induced, whereas calcium limitation had no apparent affect. |
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