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
J. Baenziger
中科院分区:
生物学2区
文献类型:
--
作者:
L. Hooper;O. Hindsgaul;J. Baenziger

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垂体糖蛋白激素促黄体激素的特征在于其在血流中的脉动外观,这对于其在卵巢中的生物活性的表达是重要的。我们之前已经证明,促黄体素具有独特的Asn连接的寡糖,以GalNAc-4-SO 4终止,使激素通过肝脏中的特异性受体从血流中快速清除,从而有助于其在循环中的脉动外观。此外,我们还发现,由颌下腺合成并分泌到唾液中的碳酸酐酶VI也带有以GalNAc-4-SO 4终止的Asn连接的寡糖,这表明这种独特的硫酸化结构除了从循环中快速清除外还介导其他生物学功能。本文报道了一种GalNAc-4-磺基转移酶的纯化,该转移酶可将硫酸根转移到Asn连接的寡糖上的末端β 1,4-连接的GalNAc。我们发现,纯化的颌下腺酶的动力学参数相同的垂体酶,表明相同的磺基转移酶是负责在垂体和碳酸酐酶VI低聚糖在颌下腺的促黄体生成素寡糖的硫酸化。这种GalNAc-4-磺基转移酶的表观分子量为128 kDa,可以用3′,5 ′-ADP(磺基转移酶活性的竞争性抑制剂)进行特异性光亲和放射性标记。这种GalNAc-4-磺基转移酶的受体特异性表明,它能够将硫酸根转移到N-和O-糖苷连接寡糖上的末端GalNAcβ1,4GlcNAc,表明这种酶也负责阿黑皮素原上O-连接聚糖的硫酸化。
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.
促黄体激素/绒毛膜促性腺激素通过受体介导的内吞作用和受体 mRNA 的 cAMP 依赖性减少来下调其受体。
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
ProXaaArg/Lys 特异性 GalNAc 转移酶和 GalNAc β 1,4GlcNAc β 1,2Man α-4-磺基转移酶的协调和限制表达。
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