Hello everyone: We are calculating the structure of a membrane peptide with two helices linked with a loop with PISEMA data (chemical shift, dipolar coupling) with dihedral angleļ¼ hydrogen bond restraints for the helical part, we also have some distance restraints for atoms from both helices. >From PISEMA experiment we expect to get models with the right tilt angle with >respect to the membrane normal (i.e., the z-axis), but we got models with a >variety of tilt angles. For example, we expect to have a tilt angle of 12 to >17 degrees, but some of the models have tilt angle that is 26, which is way >too large. I'm wondering what are the factors that determine the tilt angle of the peptide in XPLOR calculation. Thanks. Jian
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