Inhibitory analysis of the energy metabolism of the extremely haloalkaliphilic homoacetic bacterium Natroniella acetigenaстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Местоположение издательства:Road Town, United Kingdom
Первая страница:565
Последняя страница:567
Аннотация:The effect of ionophores and dicyclohexylcarbodiimide (DCCD) on growing cultures of the extremely haloalkaliphilic homoacetic bacterium Natroniella acetigena was studied. Growth and acetogenesis in media with lactate or ethanol at optimal pH value 9.7 and a salinity of 1.57% were completely inhibited by DCCD, a potent inhibitor of F1F0-ATPase. The protonophore tetrachlorosalicylanilide and the Na+/H+ antiporter monensin produced a similar effect: growth and acetogenesis stopped instantly after the addition of these compounds to an 18-h culture. N. acetigena was less sensitive to amiloride, which is an inhibitor of Na+ transport. Inhibitory analysis showed that the energy metabolism of N. acetigena depends on the generation of a transmembrane electrochemical gradient of Na+ via Na+/H+ antiport. Proton cycling via oxidative phosphorylation and F1F0-ATPase are necessary for maintaining pH-homeostasis.