Purification and Characterization of the GalNAc-4-sulfotransferase Responsible for Sulfation of GalNAcβ1,4GlcNAc-bearing Oligosaccharides (*)
Purification and Characterization of the GalNAc-4-sulfotransferase Responsible for Sulfation of GalNAcβ1,4GlcNAc-bearing Oligosaccharides (*)
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负责 GalNAcβ1,4GlcNAc 低聚糖硫酸化的 GalNAc-4-磺基转移酶的纯化和表征 (*)
DOI:
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发表时间:
1995
影响因子:
4.8
通讯作者:
J. Baenziger
中科院分区:
文献类型:
--
作者:
L. Hooper;O. Hindsgaul;J. Baenziger
The pituitary glycoprotein hormone lutropin is characterized by its pulsatile appearance in the bloodstream which is important for the expression of its biological activity in the ovary. We have previously shown that lutropin bears unique Asn-linked oligosaccharides terminating with GalNAc-4-SO4 which allow the hormone to be rapidly cleared from the bloodstream via a specific receptor in the liver, thus contributing to its pulsatile appearance in the circulation. Furthermore, we have found that carbonic anhydrase VI, synthesized by the submaxillary gland and secreted into the saliva, also bears Asn-linked oligosaccharides terminating with GalNAc-4-SO4, suggesting that this unique sulfated structure mediates other biological functions in addition to rapid clearance from the circulation. We report here the purification of a GalNAc-4-sulfotransferase which transfers sulfate to terminal β1,4-linked GalNAc on Asn-linked oligosaccharides. We show that the purified submaxillary gland enzyme has kinetic parameters identical to the pituitary enzyme, indicating that the same sulfotransferase is responsible for the sulfation of lutropin oligosaccharides in pituitary and carbonic anhydrase VI oligosaccharides in submaxillary gland. This GalNAc-4-sulfotransferase has an apparent molecular mass of 128 kDa and can be specifically photoaffinity radiolabeled with 3′,5′-ADP, a competitive inhibitor of sulfotransferase activity. The acceptor specificity of this GalNAc-4-sulfotransferase indicates that it is able to transfer sulfate to terminal GalNAcβ1,4GlcNAc on both N- and O-glycosidically linked oligosaccharides, suggesting that this enzyme is also responsible for the sulfation of O-linked glycans on proopiomelanocortin.
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DOI:
--
发表时间:
1991
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Wang,H;Segaloff,DL;Ascoli,M
通讯作者:
Ascoli,M
DOI:
10.1016/s0021-9258(19)75797-4
发表时间:
1987-01
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
H. Murakami;W. Sly
通讯作者:
H. Murakami;W. Sly
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Feldstein,JB;Silverman,DN
通讯作者:
Silverman,DN
DOI:
--
发表时间:
1988
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Spiro,RG;Bhoyroo,VD
通讯作者:
Bhoyroo,VD
DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Dharmesh,SM;Skelton,TP;Baenziger,JU
通讯作者:
Baenziger,JU