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Characterization of eight restriction endonucleases isolated from five strains of Herpetosiphon giganteus is described. HgiCI from strain Hpg9 recognizes and cleaves the degenerate sequence: GGPyPuCC, producing 5'-hexanucleotide protruding ends. Endonucleases HgiBI, HgiCII and HgiEI are isoschizomers of AvaII; HgiCIII and HgiDII are isoschizomers of SalI; and HgiDI and HgiGI are isoschizomers of AcyI. Based upon their closely related and in part overlapping recognition specificities a close evolutionary relationship is proposed for all known Hgi restriction endonucleases.

Eight new restriction endonucleases fromHerpetosiphon giganteus– divergent evolution in a family of enzymes