Identification of novel chondroitin proteoglycans in Caenorhabditis elegans: embryonic cell division depends on CPG-1 and CPG-2.

Identification of novel chondroitin proteoglycans in Caenorhabditis elegans: embryonic cell division depends on CPG-1 and CPG-2.
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秀丽隐杆线虫中新型软骨素蛋白多糖的鉴定:胚胎细胞分裂依赖于 CPG-1 和 CPG-2。

DOI:
10.1083/jcb.200603003
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发表时间:
2006-06-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Esko JD
Esko JD
中科院分区:
其他
文献类型:
--
作者:
Olson SK;Bishop JR;Yates JR;Oegema K;Esko JD

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脊椎动物产生多种硫酸软骨素蛋白多糖,在发育和组织力学中发挥重要作用。在线虫中,秀丽线虫的软骨素链缺乏硫酸盐,但在胚胎发育和外阴形态发生中发挥着重要作用。然而,由于缺乏确定的核心蛋白,将这些功能分配给特定的蛋白多糖受到了限制。我们使用生化纯化、Western blotting和质谱学相结合的方法鉴定了9个线虫软骨素蛋白多糖核心蛋白,这些蛋白在脊椎动物或其他无脊椎动物如果蝇或普通九头蛇中都没有同源物。Cpg-1/CEJ-1和Cpg-2在胚胎发育过程中表达,并与几丁质结合,提示在卵子中具有结构作用。单个CpG的RNA干扰(RNAi)缺失对胚胎存活率没有影响,但同时缺失CpG-1/CEJ-1和CpG-2会导致多核单细胞胚胎。这种胚胎致死性表现为SQV-5软骨素合成酶的RNAi缺失,这表明这两种蛋白多糖上的软骨素链是细胞质分裂所必需的。
Vertebrates produce multiple chondroitin sulfate proteoglycans that play important roles in development and tissue mechanics. In the nematode Caenorhabditis elegans, the chondroitin chains lack sulfate but nevertheless play essential roles in embryonic development and vulval morphogenesis. However, assignment of these functions to specific proteoglycans has been limited by the lack of identified core proteins. We used a combination of biochemical purification, Western blotting, and mass spectrometry to identify nine C. elegans chondroitin proteoglycan core proteins, none of which have homologues in vertebrates or other invertebrates such as Drosophila melanogaster or Hydra vulgaris. CPG-1/CEJ-1 and CPG-2 are expressed during embryonic development and bind chitin, suggesting a structural role in the egg. RNA interference (RNAi) depletion of individual CPGs had no effect on embryonic viability, but simultaneous depletion of CPG-1/CEJ-1 and CPG-2 resulted in multinucleated single-cell embryos. This embryonic lethality phenocopies RNAi depletion of the SQV-5 chondroitin synthase, suggesting that chondroitin chains on these two proteoglycans are required for cytokinesis.
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发表时间: 2000-07-07
影响因子: 4.8
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