Studies on the biosynthesis of rabbit haptoglobin

V. Chow, A. Kurosky, R. K. Murray

Research output: Contribution to journalArticle

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Abstract

Rabbit haptoglobin is a tetrameric protein consisting of two nonglycosylated α and two glycosylated β chains, the latter being joined to the former and the former to each other by disulfide linkages. We describe here the results of studies that analyzed the biosynthetic pathway of rabbit haptoglobin by using cultured hepatocytes incubated with L-[35S]cysteine. The initial form of haptoglobin detected in hepatocytes exhibited M(r) = 46,000, was glycosylated, and corresponded in migration to the initial species formed when the mRNA for rabbit haptoglobin was translated using the reticulocyte lysate system coupled with dog pancreatic microsomes. This one-chain intermediate was rapidly cleaved into a glycosylated form of the β chain and into the mature α chain, these chains being joined by disulfide linkages. Dimerization also occurred rapidly, forming a tetrameric precursor of haptoglobin. Several other intracellular glycosylated forms of the β chain were detected subsequently, representing intermediates formed during oligosaccharide processing prior to secretion of mature haptoglobin. Addition of tunicamycin (5 μg/ml) inhibited glycosylation of the initial form of haptoglobin detected, but subsequent proteolytic processing into α and β chains occurred. Our results show that the pathway of biosynthesis of rabbit haptoglobin closely resembles that reported for rat haptoglobin (Hanley, J.M., Haugen, T.H. and Heath, E.C. (1983) J. Biol. Chem. 258, 7858-7869).

Original languageEnglish (US)
Pages (from-to)6622-6629
Number of pages8
JournalJournal of Biological Chemistry
Volume259
Issue number10
StatePublished - 1984
Externally publishedYes

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Haptoglobins
Biosynthesis
Rabbits
Disulfides
Hepatocytes
Glycosylation
Tunicamycin
Dimerization
Reticulocytes
Biosynthetic Pathways
Processing
Microsomes
Oligosaccharides
Cysteine
Rats
Dogs
Messenger RNA

ASJC Scopus subject areas

  • Biochemistry

Cite this

Chow, V., Kurosky, A., & Murray, R. K. (1984). Studies on the biosynthesis of rabbit haptoglobin. Journal of Biological Chemistry, 259(10), 6622-6629.

Studies on the biosynthesis of rabbit haptoglobin. / Chow, V.; Kurosky, A.; Murray, R. K.

In: Journal of Biological Chemistry, Vol. 259, No. 10, 1984, p. 6622-6629.

Research output: Contribution to journalArticle

Chow, V, Kurosky, A & Murray, RK 1984, 'Studies on the biosynthesis of rabbit haptoglobin', Journal of Biological Chemistry, vol. 259, no. 10, pp. 6622-6629.
Chow V, Kurosky A, Murray RK. Studies on the biosynthesis of rabbit haptoglobin. Journal of Biological Chemistry. 1984;259(10):6622-6629.
Chow, V. ; Kurosky, A. ; Murray, R. K. / Studies on the biosynthesis of rabbit haptoglobin. In: Journal of Biological Chemistry. 1984 ; Vol. 259, No. 10. pp. 6622-6629.
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