ArticleExtremophiles : life under extreme conditions2017
TfoI produced by Tepidimonas fonticaldi PL17, a moderate thermophilic bacterium, is an isoschizomer of MseI.
Article in Extremophiles : life under extreme conditions, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
A moderately thermophilic Gram-negative bacterium isolated from the Polok hot spring, Sikkim, India, was identified as a strain (PL17) of Tepidimonas fonticaldi by 16S rDNA sequencing. T. fonticaldi PL17 produces a Type IIP restriction endonuclease; named TfoI. Restriction mapping, run-off sequencing of TfoI-digests of dsDNA fragments, and end compatibility of TfoI with NdeI confirmed that the enzyme recognizes and cleaves the sequence 5'-T^TAA-3', and is thus an isoschizomer of MseI. The TfoI restriction-modification genes in the T. fonticaldi PL17 genome were identified, and the annotated TfoI protein encodes a protein of 181 amino acid residues that shares 47.2% sequence identity with MseI. The native enzyme was purified using a four-column chromatography protocol, and its functional homogeneity was confirmed by standard quality control tests. The ESI-MS measured molecular weight of purified TfoI (20.696 kDa) is in agreement with that of the calculated monomeric molecular weight of the predicted TfoI protein sequence (20.694 kDa). TfoI exhibits optimal activity in the temperature range of 55-70 °C with Mg
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