W:glycine template isosters



Greetings CCLers,
 A question to all of you.
 I am trying to list possible isosters of the aminoacid motif H2N-C(R)-COOH or of
 glycine if you wish that formulation. I am not interested in this from a polymer
 point of view, I am just trying to list species that would have similar
 properties (in a QM sense) as glycine or as the aminoacid backbone.
 I am looking at a receptor that binds a single aminoacid, and the main
 interactions are with the "backbone" H2N- and -COOH groups. So I am
 thinking about which other small functional groups may serve this purpose...
 Does any of you have any pointers to reviews on this subject or a list of
 possible isosters please join in the discussion.
 Thanks -- Jan