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Singular value decomposition of torsional angles of analogs of the dopamine reuptake inhibitor GBR 12909
Author(s) -
Fiorentino Anna,
Pandit Deepangi,
Gilbert Kathleen M.,
Misra Milind,
Dios Rose,
Venanzi Carol A.
Publication year - 2006
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.20371
Subject(s) - conformational isomerism , chemistry , molecule , computational chemistry , singular value decomposition , stereochemistry , crystallography , mathematics , organic chemistry , algorithm
Analysis of large, flexible molecules, such as the dopamine reuptake inhibitor GBR 12909 ( 1 ), is complicated by the fact that they can take on a wide range of closely related conformations. The first step in the analysis is to classify the conformers into groups. Here, Singular Value Decomposition (SVD) was used to group conformations of GBR 12909 analogs by the similarity of their nonring torsional angles. The significance of the present work, the first application of SVD to the analysis of very flexible molecules, lies in the development of a novel scaling technique for circular data and in the grouping of molecular conformations using a technique that is independent of molecular alignment. Over 700 conformers each of a piperazine ( 2 ) and piperidine ( 3 ) analog of 1 were studied. Analysis of the score and loading plots showed that the conformers of 2 separate into three large groups due to torsional angles on the naphthalene side of the molecule, whereas those of 3 separate into nine groups due to torsional angles on the bisphenyl side of the molecule. These differences are due to nitrogen inversion at the unprotonated piperazinyl nitrogen of 2 , which results in a different ensemble of conformers than those of 3 , where no inversion is possible at the corresponding piperidinyl carbon. © 2006 Wiley Periodicals, Inc. J Comput Chem 27: 609–620, 2006