What is "nitrosylation"

n. 1 (context biochemistry English) The reaction of nitric oxide with a biological compound, especially with a sulfur containing part of a protein as a posttranslational modification 2 (context organic chemistry English) Any reaction with a nitrosyl compound

Nitrosylation is the covalent incorporation of a nitric oxide moiety into another (usually organic) molecule. This is often accomplished by exposure to nitrous acid or to an effective equivalent (a solution of sodium nitrite and hydrochloric acid).

This type of modification is not found for DNA molecules. Nitrosylation helps in DNA repair mechanism and regulation of cellular processes.