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.
Say the talk, and I won't mind
The days are caused, you know I never try
And I love you like the one I used to know
And if you never had the time
To last an ordinary problem
And I said I'd like to have a place to go
And you live, and you try
I could never find another
If you walk me to the car park, I won't go
To I live this all time
Flashing for that sees be saw you
I could love you like a sister,
But never had
Drawing circles in your concrete
I will know your every move
And I'll send ya, I'll send ya
And you live, and you try
I could never find another
If you walk me to the car park, I won't go
And we live, and we try
Live was hard on us between us
I will love you, I won't let go
We are one inside these walls, undercover
We are one inside these walls, undercover
We are one inside these walls, undercover
We are one in
We are one in
We are one
And you live, and you try
I could never find another
If you walk me to the car park, I won't go
And we live, and we try
Live was hard on us between us
I will love you, I won't let go
We are one
We are one
We are one