| | This class is meant to represent the non-rotameric chi observed in several amino acids (asn, asp, gln, glu, his, phe, trp, tyr ) which are rotameric for the chi closest to the backbone and non rotameric for exactly one chi angle. This non-rotameric chi (abv. nrchi) is the last chi for each of these 8 amino acids except tyrosine, where this chi is the last heavy-atom chi. The last chi on tyrosine governs a hydroxyl. Unlike in the fully rotameric residues, the last heavyatom chi in semi-rotameric residues do not "communicate" to the rotameric chi. That is, in the rotameric chi, the mean chi1 value is sensitive to the chi3 value. If the third diherdal switches from trans to g+, then chi1 would shift in response. Changes to the non-rotameric chi do not effect the rotameric chi. The data structure here is good for this model but no other. More...
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1.8.7