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We used the restriction endonuclease HaeIII to differentiate Neisseria gonorrhoeae from other Neisseria species and Branhamella catarrhalis. A total of 16 clinical isolates and four American Type Culture Collection strains of N. gonorrhoeae were resistant to HaeIII digestion, whereas 17 isolates and four American Type Culture Collection strains from eight different bacterial species were susceptible. This resistance was not caused by an enzyme inhibitor. We propose that protection of the HaeIII recognition sequence by methylation is the mechanism of resistance since N. gonorrhoeae DNA became susceptible to digestion when passed in Escherichia coli as part of a plasmid clone.

Differentiation of Neisseria gonorrhoeae from other Neisseria species by use of the restriction endonuclease HaeIII