Explain with the help of a suitable exmaple, the naming of a restriction endonuclease.

Explanation

The naming of a restriction endonuclease is done in the following way:
i) Ist letter represents the genus of the organism from which the enzyme is derived.
ii) Iind and IIIrd letters represent the species of the organism.
iii) Ivth letter represents the name of the strain.
iv) Roman number represents order of isolation. In Eco RI "Derived from E.coli, Strain R. It is the Ist to be discovered.