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Volume 270, Number 15, Issue of April 14, pp. 8691-8695, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.

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Donald E. Champagne , Roberto H. Nussenzveig , José M. C. Ribeiro

Four nitric oxide (NO)-carrying proteins have been isolated from salivary glands of the blood-sucking insect Rhodnius prolixus. These have been given the collective name ``nitrophorins,'' and individual proteins are designated NP1-NP4 in order of their relative abundance in the glands. All four reversibly bind NO; spectral shifts associated with NO binding indicate the interaction of NO with an Fe(III) heme. Physical properties, amino acid composition, and amino-terminal sequences of the nitrophorins are reported. The most abundant nitrophorin was cloned, and its sequence was determined.

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