Structures of Anabaena Calcium-binding Protein CcbP INSIGHTS INTO CA(2+) SIGNALING DURING HETEROCYST DIFFERENTIATION

	Structures of Anabaena Calcium-binding Protein CcbP INSIGHTS INTO CA(2+) SIGNALING DURING HETEROCYST DIFFERENTIATION
	Hu, Yunfei; Zhang, Xinxin; Shi, Yunming; Zhou, Yanfeng; Zhang, Wei; Su, Xiao-Dong; Xia, Bin; Zhao, Jindong; Jin, Changwen; Zhao, JD, Peking Univ, Coll Life Sci, Beijing Nucl Magnet Resonance Ctr, Beijing 100871, Peoples R China; jzhao@pku.edu.cn; changwen@pku.edu.cn
	2011
Source Publication	JOURNAL OF BIOLOGICAL CHEMISTRY
ISSN	0021-9258
Volume	286 Issue:14 Pages:-
Abstract	Ca2+-binding proteins play pivotal roles in both eukaryotic and prokaryotic cells. CcbP from cyanobacterium Anabaena sp. strain PCC 7120 is a major Ca2+-binding protein involved in heterocyst differentiation, a process that forms specialized nitrogen-fixing cells. The three-dimensional structures of both Ca2+-free and Ca2+-bound forms of CcbP are essential for elucidating the Ca2+-signaling mechanism. However, CcbP shares low sequence identity with proteins of known structures, and its Ca2+-binding sites remain unknown. Here, we report the solution structures of CcbP in both Ca2+-free and Ca2+-bound forms determined by nuclear magnetic resonance spectroscopy. CcbP adopts an overall new fold and contains two Ca2+-binding sites with distinct Ca2+-binding abilities. Mutation of Asp(38) at the stronger Ca2+-binding site of CcbP abolished its ability to regulate heterocyst formation in vivo. Surprisingly, the beta-barrel subdomain of CcbP, which does not participate in Ca2+-binding, topologically resembles the Src homology 3 (SH3) domain and might act as a protein-protein interaction module. Our results provide the structural basis of the unique Ca2+ signaling mechanism during heterocyst differentiation.
Keyword	Diphtheria-toxin Repressor Torsion Angle Dynamics Ef-hand Proteins Nmr Experiments Noe Assignment Sh3 Domains Homology Src Cyanobacteria Programs
Department	[Hu, Yunfei; Zhang, Xinxin; Xia, Bin; Zhao, Jindong; Jin, Changwen] Peking Univ, Coll Life Sci, Beijing Nucl Magnet Resonance Ctr, Beijing 100871, Peoples R China; [Shi, Yunming; Zhang, Wei; Zhao, Jindong; Jin, Changwen] Peking Univ, State Key Lab Plant & Prot Engn, Beijing 100871, Peoples R China; [Xia, Bin; Zhao, Jindong] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China; [Xia, Bin; Jin, Changwen] Peking Univ, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China; [Zhao, Jindong] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
Subject Area	Biochemistry & Molecular Biology
Funding Organization	National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323] ; National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323] ; National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323] ; National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323]
Indexed By	SCI
Language	英语
WOS ID	WOS:000289077500052
Funding Organization	National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323] ; National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323] ; National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323] ; National Natural Science Foundation [30325010, 30230040]; Ministry of Science and Technology of China [2006CB910203, 2006AA02A323]
Citation statistics
Document Type	期刊论文
Identifier	http://ir.ihb.ac.cn/handle/342005/15672
Collection	水生生物分子与细胞生物学研究中心_期刊论文
Corresponding Author	Zhao, JD, Peking Univ, Coll Life Sci, Beijing Nucl Magnet Resonance Ctr, Beijing 100871, Peoples R China; jzhao@pku.edu.cn; changwen@pku.edu.cn
Recommended Citation GB/T 7714	Hu, Yunfei,Zhang, Xinxin,Shi, Yunming,et al. Structures of Anabaena Calcium-binding Protein CcbP INSIGHTS INTO CA(2+) SIGNALING DURING HETEROCYST DIFFERENTIATION[J]. JOURNAL OF BIOLOGICAL CHEMISTRY,2011,286(14):-.
APA	Hu, Yunfei.,Zhang, Xinxin.,Shi, Yunming.,Zhou, Yanfeng.,Zhang, Wei.,...&changwen@pku.edu.cn.(2011).Structures of Anabaena Calcium-binding Protein CcbP INSIGHTS INTO CA(2+) SIGNALING DURING HETEROCYST DIFFERENTIATION.JOURNAL OF BIOLOGICAL CHEMISTRY,286(14),-.
MLA	Hu, Yunfei,et al."Structures of Anabaena Calcium-binding Protein CcbP INSIGHTS INTO CA(2+) SIGNALING DURING HETEROCYST DIFFERENTIATION".JOURNAL OF BIOLOGICAL CHEMISTRY 286.14(2011):-.

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