A visualizable chain-terminating inhibitor of glycosaminoglycan biosynthesis in developing zebrafish.

A visualizable chain-terminating inhibitor of glycosaminoglycan biosynthesis in developing zebrafish.
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DOI:
10.1002/anie.201310569
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发表时间:
2014-03-24
影响因子:
16.6
通讯作者:
Bertozzi, Carolyn R.
Bertozzi, Carolyn R.
中科院分区:
化学1区
文献类型:
--
作者:
Beahm, Brendan J.;Dehnert, Karen W.;Derr, Nicolas L.;Kuhn, Joachim;Eberhart, Johann K.;Spillmann, Dorothe;Amacher, Sharon L.;Bertozzi, Carolyn R.

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硫酸乙酰肝素(HS)和硫酸软骨素(CS)糖胺聚糖(GAG)是与蛋白聚糖相关的多糖,在动物体内具有重要功能。通过对生物合成酶的基因操作,人们对它们进行了广泛研究,但用于探究糖胺聚糖功能的化学工具却很有限。HS和CS都有一个保守的木糖残基,它将多糖链与蛋白质主链相连。在此我们报道,在斑马鱼胚胎中,通过给予尿苷二磷酸 - 4 - 叠氮 - 4 - 脱氧木糖(UDP - 4 - XylAz),可以将紧邻肽段的木糖残基代谢性地替换为链终止的4 - 叠氮 - 4 - 脱氧木糖(4 - XylAz)残基。UDP - 4 - XylAz干扰了HS和CS的生物合成,并导致发育异常,这让人联想到糖胺聚糖生物合成和层粘连蛋白突变体的情况。与蛋白质结合的4 - XylAz的叠氮取代基能够通过与荧光环辛炔探针的生物正交反应,在体内快速显示链终止的生物位点。因此,UDP - 4 - XylAz是对研究斑马鱼胚胎发生过程中糖胺聚糖功能的基因工具的补充。
Heparan sulfate (HS) and chondroitin sulfate (CS) glycosaminoglycans (GAG) are proteoglycan-associated polysaccharides with essential functions in animals. They have been studied extensively by genetic manipulation of biosynthetic enzymes, but chemical tools for probing GAG function are limited. HS and CS possess a conserved xylose residue that links the polysaccharide chain to a protein backbone. Here we report that, in zebrafish embryos, the peptide-proximal xylose residue can be metabolically replaced with a chain-terminating 4-azido-4-deoxyxylose (4-XylAz) residue by administration of UDP-4-azido-4-deoxyxylose (UDP-4-XylAz). UDP-4-XylAz disrupted both HS and CS biosynthesis and caused developmental abnormalities reminiscent of GAG biosynthesis and laminin mutants. The azide substituent of protein-bound 4-XylAz allowed for rapid visualization of the organismal sites of chain termination in vivo through bioorthogonal reaction with fluorescent cyclooctyne probes. UDP-4-XylAz therefore complements genetic tools for studies of GAG function in zebrafish embryogenesis.
DOI: 10.1021/cb100284d
发表时间: 2011-06-17
影响因子: 4
作者:
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