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An x-ray diffraction study of poly-L-arginine hydrochloride

✍ Scribed by M. Suwalsky; W. Traub

Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Volume
11
Category
Article
ISSN
0006-3525

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✦ Synopsis

An x-ray study has been made of polyarginine hydrochloride to investigate whether, like polylysine hydrochloride, it can undergo conformational changes merely from variations in the degree of hydration. X-ray powder and fiber photographs of specimens containing up to about five molecules of water peroargiriine residue show features characterist.ic of a-helical structures including a 5.4-A layer line and a meridional 1.5-A reflection. Increasing the water content from '/z to 6'/z m:lecules p,er residue causes the a axis of the hexagon$ unit cell to increase from 14.4 A to 15.8 A, with no appreciable change in the 27.0 A c axis. Removal of the last half molecule of water results in a very diffuse pattern, but on rehydration the sharp pattern reappears.

Specimens containing five to t,wenty water molecules per residue show quite a different pattern, the spacings of Thich do not vary apprzciably with hydration. This pattern includes a meridional 3.4-A reflection, a feature commonly shown by p structures, and indeed all the re!ection.; can b t satisfactoriloy indexed in terms of a monoclinic unit cell with a = 9.26 A, b = 22.05 A, c = 6.76 A, and y = 108.9'. These dimensions are shown by models to be compatible with a B pleated-sheet structure.

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