| Spk1 kinase | <enzyme> From saccharomyces cerevisiae; phosphorylates proteins on serine, threonine and less on tyrosine; amino acid sequence given in first source Registry number: EC 2.7.1.- Synonym: rad53 gene product, sad1 gene product, mec2 gene product (26 Jun 1999) |
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| SPKK protease | <enzyme> Found in egg extract of sea urchins; specific for spermatogeneous histones, specificity for ser-pro-lys-lys (spkk) and cleaves basic residues Registry number: EC 3.4.99.- (26 Jun 1999) |