Abstract
Bacteria are true artists of survival, which rapidly adapt to environmental changes like pH shifts, temperature changes and different salinities. Upon osmotic shock, bacteria are able to counteract the loss of water by the uptake of potassium ions. In many bacteria, this is accomplished by the major K+ uptake system KtrAB. The system consists of the K+-translocating channel subunit KtrB, which forms a dimer in the membrane, and the cytoplasmic regulatory RCK subunit KtrA, which binds non-covalently to KtrB as an octameric ring.
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