Structural Chemistry

, Volume 7, Issue 2, pp 139–151 | Cite as

The solution conformation of cyclic β-casomorphin-5 analogues

  • E. Kleinpeter
  • D. Ströhl
  • S. Peinze
  • W. Brandt
  • R. Schmidt
  • K. Neubert


The solution conformation of two cyclicβ-casomorphin-5 analogues H-Tyr-c(-d-Orn-Phe-Pro-Gly-)1 and H-Tyr-c(-Orn-Phe-Pro-Gly-)2 in DMSO-d6 was studied by NMR spectroscopy and accompanying force field calculations. By especially employing1H,13C, and15N chemical shifts, respectively, the temperature coefficient of the amide proton chemical shifts,3JNH,CαH andJCαH.CβH coupling constants, respectively, and nuclear Overhauser effects in the rotating frame (ROEs), in the case of1, only one preferred conformer could be identified. In the case of2, two or even more preferred conformers were found, readily interconverting on the NMR time scale. Empirical force field calculations using the SYBYL 6.0 software (TRIPOS) corroborate the experimental NMR results obtained. The conformational behavior of the compounds studied is discussed with respect to the receptor specificity of theβ-casomorphins studied.

Key words

Cyclicβ-casomorphins conformational analysis NMR spectroscopy cyclic pentapeptides force field calculations 


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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • E. Kleinpeter
    • 1
  • D. Ströhl
    • 2
  • S. Peinze
    • 2
  • W. Brandt
    • 2
  • R. Schmidt
    • 2
  • K. Neubert
    • 2
  1. 1.Institut für Organische Chemie und StrukturanalytikUniversität PotsdamPotsdamGermany
  2. 2.Fachbereich Biochemie/BiotechnologieMartin-Luther-Universität Halle-WittenbergHalleGermany

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