学术沙龙

学术沙龙第二十二期:植物叶绿体细胞器分裂的机制与空间调控

发布时间:2021-07-05 

报 告 人:陈诚  赌博十大网站平台植物科学系 长聘教轨副教授

   间:2021年7月7日(星期三) 12:40-14:00

   点:赌博十大网站平台创新楼(B楼)104会议室

主办单位:赌博十大网站平台学科与科技办、赌博十大网站平台青年教师联谊会

 

 

 

报告题目:植物叶绿体细胞器分裂的机制与空间调控

报告摘要:

叶绿体的数量随植物生长而增加,以满足植物日益增长的能量需求,并确保细胞分裂所形成的子细胞能够继承同等数量的叶绿体。叶绿体通过二元分裂的方式增加其数量,该过程由位于叶绿体中间位置的分裂装置执行。叶绿体分裂装置主要由位于叶绿体内、外膜两侧的分裂环所组成。其中,FtsZ环(简称“Z环”)是叶绿体分裂过程中形成的第一个分裂环,其正常形成和定位是叶绿体进行分裂的基础。Z环由可自聚合的类微管蛋白FtsZ聚合形成。Z环的形成和定位受叶绿体Min系统控制,其通过抑制非分裂位点处Z环的形成决定Z环的正确定位。该系统的核心成员是叶绿体基质蛋白ARC3。ARC3是FtsZ聚合的抑制子,但其活性调控的分子机制尚不清楚。本报告将着重介绍ARC3定位及其抑制FtsZ聚合活性调控机制的最新研究进展。

报告人简介:

报告人2006年获沈阳农业大学生物工程专业学士学位。2012年获中国农业大学细胞生物学专业博士学位(导师:袁明教授)。博士期间,于2010年10月至2011年10月在美国加州大学戴维斯分校进行博士联合培养(导师:William Lucas教授)。2014-2019年在美国密歇根州立大学进行博士后研究(导师:Katherine Osteryoung教授),于2019年10月入职赌博十大网站平台植科系。

【PI学科组研究方向】:

陈诚副教授课题组主要开展植物细胞器发育与增殖机制方面的研究。主要研究方向如下:

(1)叶绿体分裂的分子机制;

(2)细胞器与细胞分裂相互协调的分子机制;

(3)有色体、淀粉体等非绿色质体的发育与分化机制。

 

【代表性著作】:

  1. Chen, C.#, Cao, L., Yang, Y., Porter, K. and Osteryoung, K.W.# (2019). ARC3 Activation by PARC6 Promotes FtsZ-Ring Remodeling at the Chloroplast Division Site. The Plant Cell 31, 862–885. (#corresponding author)
  2. Chen, C., MacCready, J.S., Ducat, D.C. and Osteryoung, K.W. (2018). The Molecular Machinery of Chloroplast Division. Plant Physiology 176(1), 138–151.
  3. Zhang, M.*, Chen, C.*, Froehlich, J.E., Terbush, A.D. and Osteryoung, K.W. (2016). Roles of Arabidopsis PARC6 in Coordination of the Chloroplast Division Complex and Negative Regulation of FtsZ Assembly. Plant Physiology 170(1), 250–262.
  4. Su, S.*, Liu, Z.*, Chen, C.*, Zhang, Y., Wang, X., Zhu, L., Miao, L., Wang, X., C. and Ming, Y. (2010). Cucumber Mosaic Virus Movement Protein Severs Actin Filaments to Increase the Plasmodesmal Size Exclusion Limit in Tobacco. The Plant Cell 22, 1373–1387. (*equal contribution) 

 

 

ACADEMIC SALON (XXII)

SPEAKER: Cheng Chen

Tenure-track Associate Professor, PI

Dept. of Plant Sciences, SAB

TIME :12:40-14:00  July 7th, 2021

VENUE:Room 104, Building B, SAB

ORGANIZER:Office of Discipline and Science & Technology, SAB;

Young Teachers Association, SAB

TITLE:Mechanisms and Spatial Regulation of Chloroplast Division

ABSTRACT:

During leaf cell expansion and plant growth, the population of chloroplasts in plant cells must increase, which is crucial for photosynthetic capacity and ensures faithful inheritance of organelles during cell division. Chloroplasts are propagated through binary fission of preexisting organelles. This process is powered by a dynamic macromolecular machine positioned at the middle of the organelle. Ring-like contractile structures are assembled on both the inner and outer envelope membranes of chloroplasts. The foundation of the division machinery and first contractile structure to assemble is the stromal Filamenting temperature-sensitive Z (FtsZ) ring (Z ring), composed of the tubulin-like, self-assembling cytoskeletal protein FtsZ. The placement of the Z ring to the midplastid division site is governed by the chloroplast Min (Minicell) system, which inhibits Z-ring assembly everywhere except the division site. The central Min-system player is the FtsZ-assembly inhibitor ACCUMULATION AND REPLICATION OF CHLOROPLASTS3 (ARC3). However, the subcellular localization and the regulation of the inhibitory activity of ARC3 remains unclear. In this talk, we will update our current knowledge in terms of the function and regulation of ARC3 during chloroplast division.

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