ISSN:
0006-3525
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Conformational changes of poly(L-ornithine) [(Orn)n] were studied in a sodium dodecyl sulfate (NaDodSO4) solution by CD. (Orn)n adopted an unstable and a stable helical structure below and above the NaDodSO4 concentration range where β-structure was favored, respectively. CD stopped-flow was used to monitor the transitions from coil to the unstable helix, from the helix to β-structure, and from coil to β-structure. Only the rate of the helix to β-structure transition was accelerated by an increase in NaDodSO4 concentration, whereas the rates of the others were independent of NaDodSO4 concentration. The fractions of coil, α-helix, and β-structure in each conformation of (Orn)n caused by NaDodSO4 were computed by simulating a mixed spectrum of typical CD spectra for these structures to the experimentally obtained spectrum. The contents of the unstable and stable helical structures were less than 50 and 73%, respectively.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/bip.360240408
