Molecular Characterization of a Restriction Endonuclease PsaI from <i>Pseudomonas anguilliseptica</i> KM9 and Sequence Analysis of the PsaI R-M System.

ABSTRACT: A restriction enzyme PsaI, an isoschizomer of the type II restriction endonuclease HindIII, has been purified to homogeneity from Gram-negative bacilli Pseudomonas anguilliseptica KM9 found in a wastewater treatment plant in Poland. Experimental data revealed that R.PsaI is highly active in the presence of Co²⁺, Mg²⁺, and Zn²⁺ and reached a maximal level of activity between 2.5 and 10 mM while its activity was significantly decreased in the presence of Ca²⁺, Fe²⁺, Mn²⁺, and Ni²⁺. Moreover, we found that the purified R.PsaI did not require NaCl for enzyme activity. Restriction cleavage analysis followed by sequencing confirmed 5'-AAGCTT-3' as the recognition site. The genes for restriction-modification syste

SUBMITTER: Furmanek-Blaszk B 

PROVIDER: S-EPMC12294265 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature