Hi,
I use I-Tasser online software to do Ab-initio modeling of small peptide or protiens. It is free only for academics, if you use institutional mail ID.
Here is the link and refrence. good luck.
http://zhanglab.ccmb.med.umich.edu/I-TASSER/
BMC Biol. 2007 May 8;5:17.
Ab initio modeling of small proteins by iterative TASSER simulations.
Wu S, Skolnick J, Zhang Y.
Center for Bioinformatics and Department of Molecular Bioscience, University of Kansas, Lawrence, KS 66047, USA. st...@ku.edu
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Yours Sincerely,
Naveen Vankadari ( 那維)
Institute of Molecular Biology,
ACADEMIA SINICA,