@article { ISI:000263320900032,
	title = {Sequence-specific unusual (1 -> 2)-type helical turns in alpha/beta-hybrid peptides},
	journal = {Journal of the American Chemical Society},
	volume = {130},
	number = {52},
	year = {2008},
	month = {DEC},
	pages = {17743-17754},
	publisher = {AMER CHEMICAL SOC},
	address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA},
	abstract = {<p>This article describes novel conformationally ordered (alpha/beta-hybrid peptides consisting of repeating L-proline-anthranilic acid building blocks. These oligomers adopt a compact, right-handed helical architecture determined by the intrinsic conformational preferences of the individual amino acid residues. The striking feature of these oligomers is their ability to display an unusual periodic pseudo beta-turn network of nine-membered hydrogen-bonded rings formed in the forward direction of the sequence by 1{\textendash}\&gt;2 amino acid interactions both in solid-state and in solution. Conformational investigations of several of these oligomers by single-crystal X-ray diffraction, solution-state NMR, and ab initio MO theory suggest that the characteristic steric and dihedral angle restraints exerted by proline are essential for stabilizing the unusual pseudo beta-turn network found in these oligomers. Replacing proline by the conformationally flexible analogue alanine (Ala) or by the conformationally more constrained alpha-amino isobutyric acid (Aib) had an adverse effect on the stabilization of this structural architecture. These findings increase the potential to design novel secondary structure elements profiting from the steric and dihedral angle constraints of the amino acid constituents and help to augment the conformational space available for synthetic oligomer design with diverse backbone structures.</p>},
	issn = {0002-7863},
	doi = {10.1021/ja804297f},
	author = {Prabhakaran, Panchami and Kale, Sangram S. and Puranik, Vedavati G. and Rajamohanan, P. R. and Chetina, Olga and Howard, Judith A. K. and Hofmann, Hans-Joerg and Sanjayan, Gangadhar J.}
}
@article { ISI:000266269600030,
	title = {Sterically controlled naphthalene homo-oligoamides with novel structural architectures},
	journal = {Organic \& Biomolecular Chemistry},
	volume = {7},
	number = {11},
	year = {2009},
	month = {MAR},
	pages = {2458-2465},
	publisher = {ROYAL SOC CHEMISTRY},
	address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND},
	abstract = {<p>Herein we report novel naphthalene homo-oligoamides, derived from 4-amino-3-methoxy-naphthalene-2-carboxylic acid and 4-amino-1-methoxy-naphthalene-2-carboxylic acid as monomer building blocks, that display an anti-periplanar arrangement of the naphthyl rings, primarily induced by steric interactions between adjacent groups and functionalities.</p>},
	issn = {1477-0520},
	doi = {10.1039/b822076j},
	author = {Prabhakaran, Panchami and Puranik, Vedavati G. and Chandran, Jima N. and Rajamohanan, P. R. and Hofmann, Hans-Joerg and Sanjayan, Gangadhar J.}
}
