Send to

Choose Destination
See comment in PubMed Commons below
Proc Natl Acad Sci U S A. 1975 Dec;72(12):4933-5.

Transition dipole coupling in Amide I modes of betapolypeptides.

Author information

  • 1Harrison M. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Mich. 48104.


Our previous introduction of transition dipole coupling helped to explain the splittings in the Amide I modes of antiparallel chain pleated sheet polyglycine I. This mechanism has now been applied to the more likely rippled sheet structure of this polypeptide as well as to the pleated sheet structure of poly(L-alanine). A satisfactorily consistent explanation of the splittings in both polypeptides is obtained. Since a previously incorporated interaction constant has not been used in the present treatment, these results show that transition dipole coupling alone can provide the physical basis for understanding these splittings. It is therefore now possible to predict with confidence the hitherto unidentified v(pi,pi) frequency of the antiparallel chain pleated sheet as well as the characteristic frequencies of the parallel chain pleated sheet.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for PubMed Central
    Loading ...
    Support Center