泉古菌的细胞周期特征：多样性中的统一性。
Cell cycle characteristics of crenarchaeota: unity among diversity.
作者信息
Lundgren Magnus, Malandrin Laurence, Eriksson Stefan, Huber Harald, Bernander Rolf
机构信息
Department of Molecular Evolution, Evolutionary Biology Center, Uppsala University, Norbyvägen 18C, SE-752 36 Uppsala, Sweden.
出版信息
J Bacteriol. 2008 Aug;190(15):5362-7. doi: 10.1128/JB.00330-08. Epub 2008 May 23.
Abstract
The hyperthermophilic archaea Acidianus hospitalis, Aeropyrum pernix, Pyrobaculum aerophilum, Pyrobaculum calidifontis, and Sulfolobus tokodaii representing three different orders in the phylum Crenarchaeota were analyzed by flow cytometry and combined phase-contrast and epifluorescence microscopy. The overall organization of the cell cycle was found to be similar in all species, with a short prereplicative period and a dominant postreplicative period that accounted for 64 to 77% of the generation time. Thus, in all Crenarchaeota analyzed to date, cell division and initiation of chromosome replication occur in close succession, and a long time interval separates termination of replication from cell division. In Pyrobaculum, chromosome segregation overlapped with or closely followed DNA replication, and further genome separation appeared to occur concomitant with cellular growth. Cell division in P. aerophilum took place without visible constriction.
摘要
对嗜热古菌嗜酸栖热菌、嗜热栖热菌、嗜气栖热菌、热泉栖热菌和腾冲嗜热栖热菌进行了分析，它们代表泉古菌门中的三个不同目，采用了流式细胞术以及相差显微镜和落射荧光显微镜相结合的方法。发现所有物种的细胞周期总体组织相似，有一个短暂的复制前期和一个占代时64%至77%的主要复制后期。因此，在迄今分析的所有泉古菌中，细胞分裂和染色体复制起始紧密相继发生，并且复制终止与细胞分裂之间存在较长的时间间隔。在栖热菌属中，染色体分离与DNA复制重叠或紧随其后，进一步的基因组分离似乎与细胞生长同时发生。嗜气栖热菌的细胞分裂在没有可见缢缩的情况下发生。
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