Orbit, a novel microtubule-associated protein essential for mitosis in Drosophila melanogaster.

Orbit, a novel microtubule-associated protein essential for mitosis in Drosophila melanogaster.
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DOI:
10.1083/jcb.149.1.153
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发表时间:
2000-04-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Glover DM
Glover DM
中科院分区:
其他
文献类型:
--
作者:
Inoue YH;do Carmo Avides M;Shiraki M;Deak P;Yamaguchi M;Nishimoto Y;Matsukage A;Glover DM

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我们描述了果蝇基因,轨道,编码一个保守的165 kD微管相关蛋白(MAP)与GTP结合基序。眶内的亚形突变导致母体效应,导致合胞体胚胎中有丝分裂纺锤体分支和弯曲。在幼虫中枢神经系统中,此类突变体的有丝分裂指数升高,一些有丝分裂细胞的倍性增加。无定形等位基因显示晚期致死性和更高频率的超倍体有丝分裂细胞。细胞中的亚型突变体中,染色体可以安排,无论是在一个圆形的中期或后期样配置单极纺锤体的存在下,表明多倍体产生通过纺锤体和染色体分离缺陷,而不是在胞质分裂的缺陷。Orbit蛋白在有丝分裂中调节微管行为的作用是通过其在所有有丝分裂阶段与整个纺锤体中的微管的关联,通过其与来自胚胎提取物的微管的共纯化,以及通过发现Orbit蛋白以GTP依赖性方式直接结合到无MAP的微管而提出的。
We describe a Drosophila gene, orbit, that encodes a conserved 165-kD microtubule-associated protein (MAP) with GTP binding motifs. Hypomorphic mutations in orbit lead to a maternal effect resulting in branched and bent mitotic spindles in the syncytial embryo. In the larval central nervous system, such mutants have an elevated mitotic index with some mitotic cells showing an increase in ploidy. Amorphic alleles show late lethality and greater frequencies of hyperploid mitotic cells. The presence of cells in the hypomorphic mutant in which the chromosomes can be arranged, either in a circular metaphase or an anaphase-like configuration on monopolar spindles, suggests that polyploidy arises through spindle and chromosome segregation defects rather than defects in cytokinesis. A role for the Orbit protein in regulating microtubule behavior in mitosis is suggested by its association with microtubules throughout the spindle at all mitotic stages, by its copurification with microtubules from embryonic extracts, and by the finding that the Orbit protein directly binds to MAP-free microtubules in a GTP-dependent manner.
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