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An X‐ray diffraction investigation of poly‐ε‐carbobenzoxy‐l‐lysine and a complex form of poly‐γ‐methyl‐l‐glutamate
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yakel, Harry L. |
| Copyright Year | 1953 |
| Abstract | X-ray diagrams from oriented fibers of poly-s-carbobenzoxy-T,-lysine and a n e w form of poly7-methyl-T,-glutamate have been obtained. Spacing calculations and rough equatorial intensity measurements from the poly-s-carbobenzoxy-L-lysine photographs indicate tha t the molecules of this substance have the 3.60-residue a-helix configuration with one molecule in a simple hexagonal unit cell, a 0 ----16.69 and c o = 26.90 ~. The interpretation of the poly-y-methyl-L-glutamate photographs is more difficult, but seems to show that a monoclinic unit cell, a = 29.22, b = 8-39, c ---26.84 A, and fl = 110.0 °, is the only one that satisfactorily explains both the X-ray data and the observed density of the fibers. The structure of the molecules in this form is probably based on the 3.60-residue c~-helix, but there is some evidence which indicates that the helical configuration may be distorted slightly. |
| Starting Page | 724 |
| Ending Page | 727 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| DOI | 10.1107/S0365110X53002027 |
| Volume Number | 6 |
| Alternate Webpage(s) | http://journals.iucr.org/q/issues/1953/08-09/00/a00988/a00988.pdf |
| Alternate Webpage(s) | https://doi.org/10.1107/S0365110X53002027 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
