Isolation and structure determination of nostocyclopeptides A1 and A2 from the terrestrial cyanobacterium Nostoc sp ATCC53789

被引：65

作者：

Golakoti, T ^{[1
]}

Yoshida, WY ^{[1
]}

Chaganty, S ^{[1
]}

Moore, RE ^{[1
]}

机构：

[1] Univ Hawaii Manoa, Dept Chem, Honolulu, HI 96822 USA

来源：

JOURNAL OF NATURAL PRODUCTS | 2001年 / 64卷 / 01期

关键词：

D O I：

10.1021/np000316k

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The isolation and total structure determination of nostocyclopeptides A1 (1) and A2 (2) are described. These cyclic heptapeptides, which possess a unique imino linkage in the macrocyclic ring, are characteristic constituents of the cryptophycin-producing cyanobacterium Nostoc sp. ATCC53789. 1D TOCSY experiments proved to be very useful in identifying the seven amino acid residues in each compound, and HMBC and NOESY correlations made it possible to sequence the seven units into a total gross structure. The absolute stereochemistry was determined by directly comparing the amino acids in the acid hydrolyzate of each natural product and its peroxide oxidation and borohydride reduction products with authentic standards. Studies were carried out on the biosynthesis and initiated on the biological activity of these cyclic peptides.

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页码：54 / 59

页数：6

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