Mung bean nuclease cleavage of a dA + dT-rich sequence or an inverted repeat sequence in supercoiled PM2 DNA depends on ionic environment.

Content Provider	Semantic Scholar
Author	Kowalski, David
Copyright Year	1984
Abstract	We have determined the nucleotide sequences around two alternative sites cleaved in supercoiled PM2 DNA by single-strand-specific mung bean nuclease in different ionic environments. In 10 mM Tris-HC1 (pH 7.0, 37 degrees C), the major site is a dA+dT-rich sequence which maps with a known early denaturation region at 0.75 map units. About 30 cleavages occurred in a 135 bp region. Cleavages were largely excluded at (dA)n . (dT)n (n = 3-7) sequences. Cleavage patterns of this type have not been previously observed in dA+dT-rich sequences. With the addition of 0.1 M NaC1 the major alternative site occurred in a hyphenated inverted repeat sequence 500 bp away (0.70 map units) and did not map to an early denaturation region. One major and 4 minor cleavages occurred in the region between the repeats, suggesting that a hairpin containing at most a 12 bp stem and 10 base loop is recognized. The basis for nuclease recognition of the dA+dT-rich sequence is not clear. The differences in the sequences and cleavage patterns at the alternative sites indicate that their secondary structures differ.
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PubMed reference number	6091054v1
Volume Number	12
Issue Number	18
Journal	Nucleic acids research
Language	English
Access Restriction	Open
Subject Keyword	Cleaved cell Exclusion Inverted Repeat Sequences Microtubule-Associated Proteins Nucleotides SCN1A gene Tromethamine nuclease
Content Type	Text
Resource Type	Article