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. 1988 Jul 25;16(14B):6935–6952. doi: 10.1093/nar/16.14.6935

Nuclease SP: a novel enzyme from spinach that incises damaged duplex DNA preferentially at sites of adenine.

P W Doetsch 1, W H McCray Jr 1, K Lee 1, D R Bettler 1, M R Valenzuela 1
PMCID: PMC338343  PMID: 2457204

Abstract

A novel endonuclease has been isolated from extracts of spinach leaves (Spinacia oleracea). The enzyme has been purified by a series of column chromatography steps and has a molecular size of approximately 43,000 daltons. The spinach endonuclease cleaved double stranded DNA damaged by ultraviolet light or cis-diamminedichloroplatinum (II) primarily at sites of adenine when end-labelled DNA fragments of defined sequence were employed as substrates. The nature of the structural distortion contained in damaged, duplex DNA appears to be an important determinant for endonuclease cleavage. DNA helical distortions produced by UV light-induced (6-4) pyrimidine-pyrimidone photoproducts, but not cyclobutane pyrimidine dimers are recognized by the enzyme. The DNA cleavage products generated by the enzyme contain 3'-hydroxyl and 5'-phosphoryl termini. Single stranded DNA and RNA are hydrolyzed by the spinach endonuclease. This enzyme, which we call nuclease SP, is similar in several respects to other single-strand-specific nucleases such as N. crassa and mung bean nucleases and may function in DNA repair and/or recombination events in spinach cells. Nuclease SP should be a useful tool for the analysis of (6-4) photoproducts occurring in duplex DNA.

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