Cloning, expression, and isolation of the mannitol transport protein from the thermophilic bacterium Bacillus stearothermophilus
Tóm tắt
A mannitol phosphotransferase system (PTS) was identified in Bacillus stearothermophilus by in vitro complementation with Escherichia coli EI, HPr, and IIA(Mtl). Degenerate primers based on regions of high amino acid similarity in the E. coli and Staphylococcus carnosus EII(Mt1) were used to develop a digoxigenin-labeled probe by PCR. Using this probe, we isolated three overlapping DNA fragments totaling 7.2 kb which contain the genes mtlA, mtlR, mtlF, and mtlD, encoding the mannitol IICB,a regulator, IIA, and a mannitol-1-phosphate dehydrogenase, respectively. The mtl4 gene consists of 1,413 bp coding for a 471-amino-acid protein with a calculated mass of 50.1 kDa. The amino acid sequence shows high similarity with the sequence of IICB(Mtl) of S. carnosus and the IICB part of the IICBA(Mtl)s of E. coli and B. subtilis. The enzyme could be functionally expressed in E. coli by placing it behind the strong tac promoter. The rate of thermal inactivation at 60 degrees C of B. stearothermophilus HCB(Mt1) expressed in E. coli was two times lower than that of E. coli IICB(Mtl). IICB(Mtl) in B. stearothermophilus is maximally active at 85 degrees C and thus very thermostable. The enzyme was purified on Ni-nitrilotriacetic acid resin to greater than 95% purity after six histidines were fused to the C-terminal part of the transporter.
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