Cell division site placement and asymmetric growth in mycobacteria.

Cell division site placement and asymmetric growth in mycobacteria.
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DOI:
10.1371/journal.pone.0044582
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Robertson BD
Robertson BD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Joyce G;Williams KJ;Robb M;Noens E;Tizzano B;Shahrezaei V;Robertson BD

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分枝杆菌是放线菌的成员,通过尖端延伸生长,并且缺乏在其他杆状细菌中发现的已知细胞分裂调节剂的明显同源物。先前使用静态显微镜对分裂分枝杆菌进行的工作导致了这样的假设,即这些细胞可以不对称地生长和分裂,并且在很大的尺寸范围内,与在模型杆状生物体中观察到的细胞生长和分裂模式相反。在这项研究中,我们测试这一假设使用活细胞延时成像的分支杆菌的耻垢分枝杆菌标记荧光PBP1a,探测肽聚糖的合成和标记的细胞隔膜。我们证明,新的隔膜被准确地放置在中间细胞,观察到的不对称分裂是从细胞尖端的差异生长的结果,在快速和缓慢增长的两极之间的增长速度有2倍以上的差异。我们还表明,分裂位点没有选择在一个特征性的细胞长度,这表明这不是一个重要的线索,在分枝杆菌细胞周期。
Mycobacteria are members of the actinomycetes that grow by tip extension and lack apparent homologues of the known cell division regulators found in other rod-shaped bacteria. Previous work using static microscopy on dividing mycobacteria led to the hypothesis that these cells can grow and divide asymmetrically, and at a wide range of sizes, in contrast to the cell growth and division patterns observed in the model rod-shaped organisms. In this study, we test this hypothesis using live-cell time-lapse imaging of dividing Mycobacterium smegmatis labelled with fluorescent PBP1a, to probe peptidoglycan synthesis and label the cell septum. We demonstrate that the new septum is placed accurately at mid-cell, and that the asymmetric division observed is a result of differential growth from the cell tips, with a more than 2-fold difference in growth rate between fast and slow growing poles. We also show that the division site is not selected at a characteristic cell length, suggesting this is not an important cue during the mycobacterial cell cycle.
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发表时间: 1956-01-01
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