Int J Biochem. 1992 Apr;24(4):663-7.

Tyrosylprotein sulfotransferase in rat submandibular salivary glands.

Sundaram P, Slomiany A, Slomiany BL, Kasinathan C.

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Research Center, University of Medicine and Dentistry of New Jersey, Newark 07103-2400.

Abstract

1. The transfer of sulfate ester group from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to poly-(Glu6, Ala3, Tyr1) (EAY; Mr 47 kDa) in rat submandibular salivary gland has been investigated. The highest tyrosylprotein sulfotransferase activity was obtained in the Golgi-enriched fraction in the presence of 2 mM 5'AMP, 20 mM MnCl2 and 50 mM NaF at pH 6.2. 2. The apparent Km values for EAY and PAPS were 1.6 x 10(-6) and 1.9 x 10(-6) M, respectively. 3. Inclusion of NaCl, EDTA, NEM and DTT was inhibitory for the enzyme activity. The enzyme was 28 times less susceptible to 2,6-dichloro-4-nitrophenol inhibition than to phenol sulfotransferase inhibition. 4. This study is the first report characterizing a sulfotransferase activity specific for tyrosylprotein in rat submandibular salivary glands.

PMID:: 1516737; [PubMed - indexed for MEDLINE]

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