Characterization of anN-Acetylglucosamine-6-O-sulfotransferase from Human Respiratory Mucosa Active on Mucin Carbohydrate Chains*

Characterization of anN-Acetylglucosamine-6-O-sulfotransferase from Human Respiratory Mucosa Active on Mucin Carbohydrate Chains*
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对粘蛋白碳水化合物链有活性的人呼吸道粘膜 N-乙酰葡糖胺-6-O-磺基转移酶的表征*

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
G. Lamblin
G. Lamblin
中科院分区:
生物学2区
文献类型:
--
作者:
S. Degroote;J. Lo;G. Strecker;M. Ducourouble;P. Roussel;G. Lamblin

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人支气管粘膜的微粒体glcnac -6- o -硫转移酶活性,能够将3 ' -磷酸5 ' -磷酸腺苷的硫酸盐基团转移到人呼吸黏液中碳水化合物链的甲基- n -乙酰氨基葡萄糖或末端n -乙酰氨基葡萄糖残基上。采用高效阴离子交换色谱法对含有末端HO3S-6GlcNAc的反应产物进行了鉴定。以甲基β- n -乙酰氨基葡萄糖为底物,以0.1% Triton X-100、30 mm NaF、20 mm Mn2+、5 mm AMP、30 mm MOPS (3-(N-morpholino)丙磺酸)缓冲液、pH 6.7为条件,获得最佳活性。3′-磷酸5′-硫酸腺苷和甲基-β- n -乙酰氨基葡萄糖的表观K m值分别为9.1 × 10−6 m和0.54 × 10−3 m。与甲基-β- n -乙酰氨基葡萄糖相比,该酶对末端有GlcNAc残基的碳水化合物链更有亲和力;它不能催化硫酸盐转移到末端Galβ1-4GlcNAc序列中GlcNAc残基的第6位。然而,具有非还原末端HO3S-6GlcNAc的低聚糖是人支气管粘膜β1-4半乳糖转移酶的底物。这些数据表明,在黏液型低聚糖生物合成过程中,glcnac -6- o -磺基转移酶必须在β1-4半乳糖基化之前起作用。
A microsomal GlcNAc-6-O-sulfotransferase activity from human bronchial mucosa, able to transfer a sulfate group from adenosine 3′-phosphate 5′-phosphosulfate onto methyl-N-acetylglucosaminides or terminal N-acetylglucosamine residues of carbohydrate chains from human respiratory mucins, has been characterized. The reaction products containing a terminal HO3S-6GlcNAc were identified by high performance anion-exchange chromatography. Using methyl-β-N-acetylglucosaminide as a substrate, the optimal activity was obtained with 0.1% Triton X-100, 30 mm NaF, 20 mm Mn2+, 5 mm AMP in a 30 mm MOPS (3-(N-morpholino) propanesulfonic acid) buffer at pH 6.7. The apparent K m values for adenosine 3′-phosphate 5′-phosphosulfate and methyl-β-N-acetylglucosaminide were observed at 9.1 × 10−6 m and 0.54 × 10−3 m, respectively. The enzyme had more affinity for carbohydrate chains with a terminal GlcNAc residue than for methyl-β-N-acetylglucosaminide; it was unable to catalyze the transfer of sulfate to position 6 of the GlcNAc residue contained in a terminal Galβ1–4GlcNAc sequence. However, oligosaccharides with a nonreducing terminal HO3S-6GlcNAc were substrates for a β1–4 galactosyltransferase from human bronchial mucosa. These data point out that GlcNAc-6-O-sulfotransferase must act before β1–4 galactosylation in mucin-type oligosaccharide biosynthesis.
DOI: 10.1126/science.2475911
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发表时间: 1988
影响因子: 3
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影响因子: --
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