Polysome structure in sea urchin eggs and embryos: an electron microscopic analysis.

Polysome structure in sea urchin eggs and embryos: an electron microscopic analysis.
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海胆卵和胚胎中的多核糖体结构:电子显微镜分析。

DOI:
10.1016/0012-1606(83)90364-0
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发表时间:
1983
影响因子:
2.7
通讯作者:
MillerJr,OL
MillerJr,OL
中科院分区:
生物学3区
文献类型:
--
作者:
Martin,KA;MillerJr,OL

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改进的染色质扩散技术已被用于制备可复制的多体扩散,用于电镜可视化。我们分析了海胆(Lytechinus pictus)卵和胚胎的多体,以阐明受精后蛋白质合成活性爆发过程中发生的一些事件。我们已经证实,受精后蛋白质合成的增加是伴随着信使RNA分子进入多体的募集。无核糖体尾部的存在是mRNA首次被翻译的多体的结构特征。该结构标记使我们能够得到1.5-1.8个氨基酸/秒的延伸率和5分钟的传输时间,为平均大小的多聚体。16°C的象形胚。我们还观察到卵和胚胎中多聚体的结构和平均大小之间的差异。卵多体(平均大小= 11.96个核糖体,n= 671)比1小时胚多体(平均大小= 7.14个核糖体,n= 863)更长,10%的卵多体含有可见的间隙,而1小时胚多体中含有内部无核糖体区域的不到1%。我们推测这种差异反映了相对休眠的卵细胞翻译效率较低。
Modified chromatin-spreading techniques have been used to prepare reproducible spreads of polysomes for EM visualization. We have analyzed polysomes of sea urchin (Lytechinus pictus) eggs and embryos to elucidate some of the events which occur during the burst of protein synthetic activity following fertilization. We have confirmed that the rise in protein synthesis after fertilization is concomitant with the recruitment of messenger RNA molecules into polysomes. The presence of ribosome-free tails is a structural feature of polysomes in which the mRNA is being translated for the first time. This structural marker has allowed us to derive an elongation rate of 1.5–1.8 amino acids/sec and a transit time of 5 min for the average-sized polysome inL. pictusembryos at 16°C. We have also observed a difference between the structure and the average size of polysomes in the egg and embryo. Egg polysomes are longer (average size = 11.96 ribosomes,n= 671) than 1-hr embryo polysomes (average size = 7.14 ribosomes,n= 863) and 10% of the egg polysomes contain visible gaps while less than 1% of the 1-hr embryo polysomes contain internal ribosome-free regions. We speculate that such differences reflect the lower translation efficiency of the relatively dormant egg cell.
DOI: --
发表时间: 1976
影响因子: 2.7
作者:
B. Brandhorst
通讯作者: B. Brandhorst
DOI: 10.1016/0012-1606(69)90025-6
发表时间: 1969
影响因子: 2.7
作者:
T. Humphreys
通讯作者: T. Humphreys
DOI: 10.1073/pnas.57.4.899
发表时间: 1967-01-01
影响因子: 11.1
作者:
EPEL, D
通讯作者: EPEL, D
海胆受精卵母体含 Poly(A) mRNA 的动态变化
DOI: 10.1016/0092-8674(77)90084-8
发表时间: 1977
期刊: Cell
影响因子: 64.5
作者:
F. Wilt
通讯作者: F. Wilt
DOI: 10.1038/278469a0
发表时间: 1979
期刊: Nature
影响因子: 64.8
作者:
M. B. Hille;Alegria Albers
通讯作者: Alegria Albers