Explain with the help of a suitable example the naming of a restriction endonuclease.

The naming of a restriction endonuclease is done in the following way:

i)     I^st letter represents the genus of the organism from which the enzyme is derived.

ii)    II^nd and III^rd letters represent the species of the organism.

iii)  IV^th letter represents the name of the strain.

iv)  Roman number represents order in which the enzyme was isolated.

For example, In EcoRI is Derived from genus Escherichia and species coli of, strain R.
It is the 1^st to be discovered.