Site-specific endonuclease from thermophilic Bacillus species MK strain is isoschizomer of SalI |
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Authors: | MA Kerzhner SA Shiryaev LA Zheleznaya NI Matvienko |
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Affiliation: | Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, Russia. protres@sovam.com |
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Abstract: | Screening of thermophilic bacterial strains revealed a strain containing site-specific endonuclease BspMKI. This endonuclease was purified to functional homogeneity during sequential chromatographic steps. The enzyme recognizes sequence 5'-G decreases TCGAC-3' on DNA molecule and is isoschizomer of endonuclease SalI. The molecular mass of BspMKI is about 45 kD. The enzyme is maximally active at 55 degrees C and MRB (50 mM NaCl, 10 mM Tris-HCl, pH 7.4, 10 mM MgCl2, 1 mM dithiothreitol) is the optimal buffer. The enzyme is highly stable and retains its activity during two weeks at room temperature. |
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