Is the periplasm continuous in filamentous multicellular cyanobacteria?

被引:92
作者
Flores, Enrique
Herrero, Antonia
Wolk, C. Peter
Maldener, Iris
机构
[1] Univ Sevilla, CSIC, Inst Bioquim Vegetal & Fotosintesis, E-41092 Seville, Spain
[2] Michigan State Univ, DOE Plant Res Lab, E Lansing, MI 48824 USA
[3] Michigan State Univ, Dept Plant Biol, E Lansing, MI 48824 USA
[4] Univ Regensburg, Lehrstuhl Zellbiol & Pflanzenphysiol, D-93040 Regensburg, Germany
关键词
D O I
10.1016/j.tim.2006.08.007
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Filamentous, heterocyst-forming cyanobacteria are multicellular organisms in which individual cells exchange nutrients and, presumably, regulatory molecules. Unknown mechanisms underlie this exchange. Classical electron microscopy shows that filamentous cyanobacteria bear a Gram-negative cell wall comprising a peptidoglycan layer and an outer membrane that are external to the cytoplasmic membrane, and that the outer membrane appears to be continuous along the filament of cells. This implies that the periplasmic space between the cytoplasmic and outer membranes might also be continuous. We propose that a continuous periplasm could constitute a communication conduit for the transfer of compounds, which is essential for the performance of these bacteria as multicellular organisms.
引用
收藏
页码:439 / 443
页数:5
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