Manipulation of Pattern of Cell Differentiation in a hetR Mutant of Anabaena sp. PCC 7120 by Overexpressing hetZ Alone or with hetP

Manipulation of Pattern of Cell Differentiation in a hetR Mutant of Anabaena sp. PCC 7120 by Overexpressing hetZ Alone or with hetP
复制标题

鱼腥藻 hetR 突变体细胞分化模式的操纵。

DOI:
10.3390/life8040060
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发表时间:
2018-11
期刊:
影响因子:
3.2
通讯作者:
Xu Xudong
Xu Xudong
中科院分区:
生物学4区
文献类型:
--
作者:
Zhang He;Xu Xudong

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丝状蓝藻中的鱼腥藻(Anabaena sp.)PCC7120,单个异形胞以半规则的间隔分化,以响应氮素的递减。HetR是异形胞分化的主要调节因子,hetP和HetZ是HetR直接调控的两个基因。在PCC7120的IHB(水生生物研究所)亚株产生的hetR突变体中,通过适度表达hetZ和hetP可以恢复异形胞的形成。由此产生的杂胞位于末端位置。我们使用串联启动子PrbcLPpetE在hetR突变体中高效表达hetZ和hetP。HetZ和hetP的共表达使hetR突变体在末端和中间位置形成多个连续的异形囊。单独表达HetZ会导致末端定位的异形囊,而单独表达hetP会导致串中细胞增大。在没有HetR的情况下,异形囊的形成对多肽抑制剂RGSGR不敏感。
In the filamentous cyanobacterium, Anabaena sp. PCC 7120, single heterocysts differentiate at semi-regular intervals in response to nitrogen stepdown. HetR is a principal regulator of heterocyst differentiation, and hetP and hetZ are two genes that are regulated directly by HetR. In a hetR mutant generated from the IHB (Institute of Hydrobiology) substrain of PCC 7120, heterocyst formation can be restored by moderate expression of hetZ and hetP. The resulting heterocysts are located at terminal positions. We used a tandem promoter, PrbcLPpetE, to express hetZ and hetP strongly in the hetR mutant. Co-expression of hetZ and hetP enabled the hetR mutant to form multiple contiguous heterocysts at both terminal and intercalary positions. Expression of hetZ, alone resulted in terminally located heterocysts, whereas expression of hetP, alone produced enlarged cells in strings. In the absence of HetR, formation of heterocysts was insensitive to the peptide inhibitor, RGSGR.
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