Dear ccp4 users,
I have found contadictory classifications in side-chain dihedral chi1,
namely for gauche(+) and gauche(-), and I would like to know the actual
convention.
It seems that in general for polymers G- (gauche(-) ?) and G+ (gauche(+)
?) correspond to dihedral angles -60 and +60 degrees, according to
http://goldbook.iupac.org/C01088.html, but I also find exanples where
chi1 is defined by dihedral N-CA-CB-CG with gauche(-) and gauche(+)
corresponding to dihedral angles +60 and -60 degrees (reversing the
IUPAC naming above).
Does anyone knows what is the accepted convention ? A reference?
Thanks.
Carlos
--
**************************************
Dr. Carlos Frazao
Structural Biology Laboratory -
Macromolecular Crystallography Unit
ITQB-UNL, Av Republica, Apartado 127
2781-901 Oeiras, Portugal
Phone: (351)-214469666
FAX: (351)-214433644
e-mail: fra...@itqb.unl.pt
www.itqb.unl.pt
