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Home  >  Journal list  >  Polymer Journal  >  Vol.17  No.4 (1985)  >  pp.587-595

Polymer Journal
<<Previous article Vol.17  No.4 (1985)   pp.587 - 595 Next article>>

Intramolecular End-to-End Energy Transfer on Polypeptide Chains. Effects of Chain Length, Temperature, and Chain Stiffness

Masahiko Sisido1), Syun Egusa2), Kazufumi Yagyu2) and Yukio Imanishi2)
1) Research Center for Medical Polymers and Biomaterials, Kyoto University
2) Department of Polymer Chemistry, Kyoto University


ABSTRACT:  Static conformations of oligo- and polysarcosine chains were investigated by the energy transfer from an energy donating 2-naphthyl group attached to one end of the chain, to an energy accepting dimethylaminonaphthalenesulfonyl (dansyl) group on the other end of the chain [Dns-(Sar)n-2Nap]. The energy transfer efficiency X, was determined from fluorescence excitation spectra of the dansyl group as a function of chain length and temperature. An alternation in the transfer efficiency was observed with a step-by-step increase in the number of sarcosine units n, from 4 to 9, with higher efficiencies for odd n’s. The efficiency decreased with further increase in chain length but could still be detected at n=150 (X=0.11). The transfer efficiency increased considerably at low temperatures and it approached unity at about −60°C, even for such long chains as n=120. The energy transfer between the donor-acceptor pair attached to a rigid poly(β-benzyl L-aspartate) chain, Dns-[Asp(OBzl)]n-2Nap, showed no temperature dependence. The marked enhancement observed on the polysarcosine chain was ascribed to a conformational change at low temperatures into folded or compact conformations.


Keyword:
Energy Transfer/ Intramolecular Interaction/ Polysarcosine/ Poly(β-benzyl L-aspartate)/ Conformation

Published online: March 03, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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