TY - JOUR N1 - Copyright of this article belongs to Elsevier Science. ID - open863 UR - http://dx.doi.org/10.1016/S0040-4039(01)00788-2 IS - 28 A1 - Thakur, A K A1 - Kishore, Raghuvansh Y1 - 2001/// N2 - X-Ray diffraction analysis of the model peptide Boc-Thr-Thr-OCH3 reveals the existence of distinctive conformational characteristics: semi-extended (?=?62.1°; ?=137.1°) and semi-folded (?=?130.3°; ?T=5.7°) of the N- and C-terminus Thr residues, respectively. Surprisingly, an overall significantly ?flat? conformation is stabilised by a number of novel main-chain to side-chain intramolecular hydrogen bonds, i.e. two non-conventional: C?i+1?H?O?Ci?1 and C?i?H?Oi+1 types and two conventional: Ni?H?O?i and O?i?H?Ni types of interactions PB - Elsevier Science JF - Tetrahedron Letters VL - 42 SN - 00404039 TI - Crystallographic characterisation of novel ?-turn like folds in a model peptide: stabilisation by main-chain to side-chain interactions SP - 4691 AV - restricted EP - 4694 ER -