Inhibition of CMP-sialic acid transport by endogenous 5-methyl CMP.

Inhibition of CMP-sialic acid transport by endogenous 5-methyl CMP.
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DOI:
10.1371/journal.pone.0249905
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Whorton MR
Whorton MR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ahuja S;Cahill J;Hartfield K;Whorton MR

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核苷酸-糖转运体(NST)将核苷酸-糖结合物运输到高尔基体腔,在那里它们被用于合成多糖。我们之前报道了哺乳动物的一种NST,CMP-唾液酸转运体(CST)的晶体结构(Ahuja和Whorton 2019)。这些结构阐明了底物识别、选择性和运输的许多方面;然而,一个基本未解决的问题是,NSTs的运输活动如何受到生理调节,作为一种产生大量观察到的多糖结构的手段。在这里,我们描述了一种内源性甲基化形式的胞苷一磷酸(M5cMP)结合并抑制CST的发现。细胞中m5cMP的存在是RNA降解的结果,RNA的胞嘧啶碱基通过表观遗传过程转录后甲基化。因此,这项工作不仅证明了m5cMP是CST的一种新的生理调节因子,而且还在表观遗传调控基因表达和糖基化调节之间建立了联系。
Nucleotide-sugar transporters (NSTs) transport nucleotide-sugar conjugates into the Golgi lumen where they are then used in the synthesis of glycans. We previously reported crystal structures of a mammalian NST, the CMP-sialic acid transporter (CST) (Ahuja and Whorton 2019). These structures elucidated many aspects of substrate recognition, selectivity, and transport; however, one fundamental unaddressed question is how the transport activity of NSTs might be physiologically regulated as a means to produce the vast diversity of observed glycan structures. Here, we describe the discovery that an endogenous methylated form of cytidine monophosphate (m5CMP) binds and inhibits CST. The presence of m5CMP in cells results from the degradation of RNA that has had its cytosine bases post-transcriptionally methylated through epigenetic processes. Therefore, this work not only demonstrates that m5CMP represents a novel physiological regulator of CST, but it also establishes a link between epigenetic control of gene expression and regulation of glycosylation.
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