What is "pterin"

n. (context organic compound English) A ketonic amide derivative of pteridine responsible for some of the colouring in nature. It is also a component of folic acid.

Pterin is a heterocyclic compound composed of a pteridine ring system, with a keto group and an amino group on positions 4 and 2 respectively. Several tautomers of pterin exist and are shown below. Derivatives of pterin include pterins and folates.

Pterins, as a group, are compounds that are derivatives of the basic pterin structure, described in the beginning, with additional functional groups attached to the pyrazine subring. Pterins were first discovered in the pigments of butterfly wings (hence the origin of their name, from the Greek pteron (πτερόν), wing) and perform many roles in coloration in the biological world. Pterins also function as cofactors in enzyme catalysis.

Folates are “conjugated” pterins that contain p-aminobenzoic acid (known as pteroic acid) and L- glutamates connected to the methyl group at position 6 of the pteridine ring system. They are critical compounds in a large number of biological group transfer reactions. These folate-dependent biosynthetic reactions include the transfer of methyl groups from 5-methyltetrahydrofolate to homocysteine to form L-methionine, and the transfer of formyl groups from 10-formyltetrahydrofolate to L-methionine to form N-formylmethionine in initiator tRNAs.