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Role of aromatic residues in stabilizing the secondary and tertiary structure of avian pancreatic polypeptide
Author(s) -
Palermo Nicholas Y.,
Csontos József,
Murphy Richard F.,
Lovas Sándor
Publication year - 2007
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.21521
Subject(s) - chemistry , protein tertiary structure , hydrogen bond , polar , protein secondary structure , aromaticity , side chain , residue (chemistry) , molecular dynamics , crystallography , stereochemistry , computational chemistry , molecule , organic chemistry , biochemistry , physics , astronomy , polymer
Avian pancreatic polypeptide (aPP) is a 36 residue protein that exhibits a tertiary fold. Results of previous experimental and computational studies indicate that the structure of aPP is stabilized more by nonbonded interactions than by the hydrophobic effect. Aromatic residues are known to participate in a variety of long‐range nonbonded interactions, with both backbone atoms and the atoms of other side‐chains, which could be responsible, in part, for the stability of both the local secondary structure and the tertiary fold. The effect of these aromatic interactions on the stability of aPP was calculated using BHandHLYP/cc‐pVTZ. Aromatic residues were shown to participate in multiple hydrogen bonded and weakly polar interactions in the secondary structure. The energies of the weakly polar interactions are comparable with those of hydrogen bonds. Aromatic residues were also shown to participate in multiple weakly polar interactions across the tertiary fold, again with energies similar to those of hydrogen bonds. © 2007 Wiley Periodicals, Inc. Int J Quantum Chem, 2008