The effect of protein synthesis inhibitors on the glycosylation site occupancy of recombinant human prolactin

The effect of protein synthesis inhibitors on the glycosylation site occupancy of recombinant human prolactin
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蛋白质合成抑制剂对重组人催乳素糖基化位点占用的影响

DOI:
10.1007/bf00762394
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发表时间:
2004
期刊:
影响因子:
2.2
通讯作者:
G. Stephanopoulos
G. Stephanopoulos
中科院分区:
生物学4区
文献类型:
--
作者:
Marc Shelikoff;A. Sinskey;G. Stephanopoulos

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利用一系列蛋白质合成抑制剂研究了C127细胞重组人催乳素的合成与N-糖基化位点占有率之间的关系。非致死浓度的氟化钠、谷氏菌素、嘌呤霉素、茴香霉素和恩替卡韦没有改变位点占有率,但低浓度(<10μg ml−1)的放线菌酮使分泌的含催乳素寡糖的比例从20%增加到80%。环己酰亚胺是蛋白质合成延伸步骤的抑制剂。添加放线菌酮后观察到的糖基化位点占有率增加与目前的观点一致,即初始糖基化事件在有限的时间段内协同发生。环己酰亚胺可以通过降低伸长率来延长该时间段。然而,没有任何效果,从处理与其他抑制剂的延伸表明,放线菌酮是独特的,在这个系统中的行为。
The relationship between synthesis and N-liked glycosylation site occupancy of recombinant human prolactin produced from C127 cells was studied with the aid of a battery of protein synthesis inhibitors. Non-lethal concentrations of sodium fluoride, gougerotin, puromycin, anisomycin, and emetine did not alter site occupancy, but low concentrations (<10μg ml−1) of cycloheximide increased the fraction of secreted prolactin bearing oligosaccharide from 20% to 80% of the total. Cycloheximide is an inhibitor of the elongation step of protein synthesis. The observed increase in glycosylation site occupancy upon addition of cycloheximide is consistent with the current opinion that the initial glycosylation event occurs cotranslationally during a limited time period. Cycloheximide may extend this time period by reducing elongation rate. However, the absence of any effect from treatment with other inhibitors of elongation suggests that cycloheximide is unique in its behavior on this system.
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