Article: CD-n.m.r. study of the solution conformation of bradykinin analogs containing alpha-aminoisobutyric acid.
International journal of peptide and protein research
1987 Volume 29, Issue 4, Page(s) 486–496
Abstract: ... of bradykinin (BK) has been probed by complementary CD and 1H n.m.r. measurements. The conclusion reached is ... that substitution of AIB for Pro2 and/or Pro3 in BK stabilizes a degree of beta-turn conformation in the N-terminal ... and cis' Pro and the propensity for a beta-turn at the N-terminus of the peptide. ...
Abstract | The conformation in aqueous solution of several alpha-aminoisobutyric acid (AIB)-containing analogs of bradykinin (BK) has been probed by complementary CD and 1H n.m.r. measurements. The conclusion reached is that substitution of AIB for Pro2 and/or Pro3 in BK stabilizes a degree of beta-turn conformation in the N-terminal tetrapeptide moiety of the resulting analogs. Changing the solvent from water to DMSO or TFE further enhances the contribution of particular hydrogen bonded structures to the time-averaged conformation of these peptides. Bradykinin and [AIB7]-BK adopt similar hydrogen bonded conformations in TFE, apparently with a contribution from a beta-turn involving their common Arg1-Pro2-Pro3-Gly4 moiety. The contrasting biological activities of BK and its AIB-analogs are considered in terms of the conformational analogy between the AIB-residue and cis' Pro and the propensity for a beta-turn at the N-terminus of the peptide. |
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MeSH term(s) | Amino Acid Sequence ; Aminoisobutyric Acids ; Bradykinin/analogs & derivatives ; Bradykinin/chemical synthesis ; Circular Dichroism ; Magnetic Resonance Spectroscopy/methods ; Protein Conformation ; Solutions ; Spectrophotometry, Ultraviolet/methods ; Structure-Activity Relationship |
Chemical Substances | Aminoisobutyric Acids ; Solutions ; 2-aminoisobutyric acid (1E7ZW41IQU) ; Bradykinin (S8TIM42R2W) |
Language | English |
Publishing date | 1987-04 |
Publishing country | Denmark |
Document type | Comparative Study ; Journal Article ; Research Support, U.S. Gov't, P.H.S. |
ZDB-ID | 121895-5 |
ISSN | 0367-8377 ; 0300-9769 |
ISSN | 0367-8377 ; 0300-9769 |
DOI | 10.1111/j.1399-3011.1987.tb02275.x |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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