RGD Reference Report - Molecular cloning and expression of rat liver N-heparan sulfate sulfotransferase. - Rat Genome Database

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Molecular cloning and expression of rat liver N-heparan sulfate sulfotransferase.

Authors: Hashimoto, Y  Orellana, A  Gil, G  Hirschberg, CB 
Citation: Hashimoto Y, etal., J Biol Chem 1992 Aug 5;267(22):15744-50.
RGD ID: 68801
Pubmed: PMID:1379236   (View Abstract at PubMed)

N-Heparan sulfate sulfotransferase catalyzes the transfer of sulfate from 3'-phosphoadenosine 5'-phosphosulfate to the nitrogen of glucosamine in heparan sulfate. The enzyme has been previously purified to apparent homogeneity from rat liver (Brandan, E., and Hirschberg, C. B. (1988) J. Biol. Chem. 263, 2417-2422). We have now cloned the rat liver enzyme using the following strategy: (a) the amino acid sequence was obtained from tryptic peptides of the purified protein, (b) mixed oligonucleotides were generated based on the sequence of the tryptic peptides, (c) a polymerase chain reaction fragment was obtained using mixed oligonucleotide interprimer amplification of cDNA, and (d) this fragment was used to screen rat liver lambda gt 10 and lambda ZAP libraries. Three clones were obtained, one of which seems to contain the complete coding sequence of the N-heparan sulfate sulfotransferase (N-HSST). Evidence that the cDNA clone corresponds to the previously purified and characterized N-HSST was the following: (a) the predicted sequence of the N-HSST contains all of the 11 tryptic peptides obtained from the purified protein, (b) when a cDNA containing the sequence coding for the N-HSST was introduced in a eukaryotic expression vector and transfected in COS-1 cells, the enzyme activity was expressed 9-fold over controls, and (c) the characteristic of the predicted protein fits with the purified protein in terms of molecular weight, membrane localization, and its being an N-linked glycoprotein. The size of the longest cDNA isolated is 4.1 kilobases, which is in close agreement with the 4.2-kilobase size of one of the mRNA observed in Northern analyses. In addition, messages of 7.0 and 8.5 kilobases were also observed, suggesting that a large portion is untranslated. The latter messages were the major mRNA species detected.



Gene Ontology Annotations    

Biological Process

Molecular Function

Objects Annotated

Genes (Rattus norvegicus)
Ndst1  (N-deacetylase and N-sulfotransferase 1)


Additional Information