PatU3 plays a central role in coordinating cell division and differentiation in pattern formation of filamentous cyanobacterium Nostoc sp. PCC 7120

Liang, Yin; Zheng, Zhenggao; Li, Yilin; Li, Xiying; Deng, Cheng; Dong, Chunxia; Liu, Yixuan; Zhao, Jindong

doi:10.1007/s11427-023-2380-1

Cited by 1 publication

(1 citation statement)

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“…Certain components in cell division, such as FtsZ (Sakr, Jeanjean, et al, 2006;Wang et al, 2021), likely play a critical role in the coordination with heterocyst differentiation. Likewise, some factors involved in heterocyst development, such as PatA，HetF and PatU3 (Liu et al, 2023;Valladares et al, 2020;Xing et al, 2022;Yin et al, 2023;Young-Robbins et al, 2010), are the essential factors for an interplay with cell division. Understanding how these factors manage cell division so that a pro-heterocyst at the commitment step can proceed to morphogenesis will be the key for uncovering the underlying mechanism.…”

Section: Discussionmentioning

confidence: 99%

HetF defines a transition point from commitment to morphogenesis during heterocyst differentiation in the cyanobacterium Anabaena sp. PCC 7120

Xing,

Liu,

Zhang

2023

Molecular Microbiology

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The filamentous cyanobacterium Anabaena sp. PCC 7120 is able to form heterocysts for nitrogen fixation. Heterocyst differentiation is initiated by combined‐nitrogen deprivation, followed by the commitment step during which the developmental process becomes irreversible. Mature heterocysts are terminally differentiated cells unable to divide, and cell division is required for heterocyst differentiation. Previously, we have shown that the HetF protease regulates cell division and heterocyst differentiation by cleaving PatU3, which is an inhibitor for both events. When hetF is required during the developmental program remains unknown. Here, by controlling the timing of hetF expression during heterocyst differentiation, we provide evidence that hetF is required just before the beginning of heterocyst morphogenesis. Consistent with this finding, transcriptome data show that most of the genes known to be involved in the early step (such as hetR and ntcA) or the commitment step (such as hetP and hetZ) of heterocyst development could be expressed in the ΔhetF mutant. In contrast, most of the genes involved in heterocyst morphogenesis and nitrogen fixation remain repressed in the mutant. These results indicated that in the absence of hetF, heterocyst differentiation is able to be initiated and proceeds to the stage just before heterocyst envelope formation.

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