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Background  Serine/threonine protein kinases are highly conserved kinases with a wide distribution in microbes and with multiple functions.  Mesorhizobium alhagi  CCNWXJ12-2, a α-proteobacterium which could be able to form symbiosis with  Alhagi sparsifolia  in northwest of China, contains a putative PrkA-family serine protein kinase, PrkA. In our previous study, the expression of  prkA  was found to be downregulated in high-salt conditions. To elucidate the function of  M. alhagi  PrkA, a  prkA  deletion mutant was constructed and the phenotypes of the mutant were analyzed.    Results  The salt and alkaline tolerance and antioxidant capacity of the wild-type strain and the  prkA  deletion mutant was measured. Our results showed that the deletion mutant had higher salt and alkaline tolerance than the wild-type strain. The total cellular Na +  content was measured and showed no significant difference between the wild-type strain and the mutant. The  prkA  deletion mutant also showed a higher H 2 O 2  tolerance than the wild-type strain. Therefore the activities of antioxidant enzymes were measured. Catalase activity was similar in the wild-type and the deletion mutant, while the superoxide dismutase activity in the mutant was higher than that in the wild-type.    Conclusions  We firstly analyze the function of a serine protein kinase, PrkA, in  M. alhagi . Our data indicate that PrkA could reduce the survival of  M. alhagi  under environmental stress and deletion of  prkA  dramatically improved the salt and alkaline tolerance and antioxidant capacity of  M. alhagi .

Functional analysis of PrkA - a putative serine protein kinase from Mesorhizobium alhagi CCNWXJ12-2 - in stress resistance