A new site-specific endonuclease, ScaI, from Streptomyces caespitosus.

Interaction of the restriction endonuclease ScaI with its substrates.

The kinetic constants of the site-specific endonuclease, ScaI, for various substrates were determined. We estimated Vmax and Km for octa-, deca-, dodeca-, and hexadecanucleotides and for plasmid pBR322 DNA. Vmax for these substrates were close, but Km were quite different (in decreasing order, octa- greater than deca-, dodeca-, hexadeca- greater than pBR322). The results were discussed with res...

A type II restriction endonuclease with an eight nucleotide specificity from Streptomyces fimbriatus.

A new site-specific endonuclease, Sfi I, has been isolated from Streptomyces fimbriatus . This is the first report of a type II restriction endonuclease whose recognition specificity requires eight nucleotides. Sfi I cleaves the sequence, GGCCNNNN / NGGCC , symmetrically to produce a three base, 3' extension.

Characterization of a site-specific restriction endonuclease from Streptomyces aureofaciens.

A new type II sequence-specific restriction endonuclease, SauI, was isolated from Streptomyces aureofaciens IKA18/4. The purified enzyme was free of contaminating exonuclease and phosphatase activities. SauI cleaved lambda DNA at two sites, but did not cleave pBR322, simian virus 40, or phi X174 DNA. SauI recognized the septanucleotide sequence 5'-CCTNAGG-3' and cleaved at the position indicate...

New mitomycin, 10-decarbamoyloxy-9-dehydromitomycin B from Streptomyces caespitosus.

Purification and characterization of the DNA cleavage and recognition site of I-ScaI mitochondrial group I intron encoded endonuclease produced in Escherichia coli.

The second intron in the mitochondrial cytb gene of Saccharomyces capensis, belonging to group I, encodes a 280 amino acid protein containing two LAGLIDADG motifs. Genetic and molecular studies have previously shown that this protein has a dual function in the wild-type strain. It acts as a specific homing endonuclease I- Sca I promoting intron mobility and as a maturase promoting intron splici...