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Science 20 June 1969:
Vol. 164. no. 3886, pp. 1401 - 1402
DOI: 10.1126/science.164.3886.1401
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Articles

2, 3-cis-3, 4-trans-3, 4-Dihydroxy-L-proline: Mass Spectrometry and X-ray Analysis

Isabella L. Karle 1, John W. Daly 2, and Bernhard Witkop 2

1 U. S. Naval Research Laboratory, Washington, D.C. 20390
2 National Institute of Arthritis and Metabolic Diseases, Bethesda, Maryland 20014

Mass spectrometry showed the new amino acid from diatomn cell walls to be a dihydroxyproline. X-ray analysis of the unmarked free amino acid by the use of the symbolic addition procedure revealed the comnplete three-dimtensional structure as 2, 3-cis-3, 4-trans-3, 4-dihydroxy-L-proline with carbon number 3 being 0.06 angstrom above the plane of the pyrrolidine ring.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)