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Fan D, Cao S, Zhou Q, Zhang Y, Yue L, Han C, Yang B, Wang Y, Ma Z, Zhu L, Liu C. Exploring the roles of substrate-binding surface of the chaperone site in the chaperone activity of trigger factor. FASEB J 2018; 32:fj201701576. [PMID: 29906241 DOI: 10.1096/fj.201701576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Trigger factor (TF) is a key component of the prokaryotic chaperone network, which is involved in many basic cellular processes, such as protein folding, protein trafficking, and ribosome assembly. The major chaperone site of TF has a cradle-like structure in which protein substrate may fold without interference from other proteins. Here, we investigated in vivo and in vitro the roles of hydrophobic and charged patches on the edge and interior of cradle during TF-assisted protein folding. Our results showed that most of the surface of the cradle was involved in TF-assisted protein folding, which was larger than found in early studies. Although the inner surface of cradle was mostly hydrophobic, both hydrophobic and electrostatic patches were indispensable for TF to facilitate correct protein folding. However, hydrophobic patches were more important for the antiaggregation activity of TF. Furthermore, it was found that the patches on the surface of cradle were involved in TF-assisted protein folding in a spatial and temporal order. These results suggest that the folding-favorable interface between the cradle and substrate was dynamic during TF-assisted protein folding, which enabled TF to be involved in the folding of substrate in an aggressive manner rather than acting as a classic holdase.-Fan, D., Cao, S., Zhou, Q., Zhang, Y., Yue, L., Han, C., Yang, B., Wang, Y., Ma, Z., Zhu, L., Liu, C. Exploring the roles of substrate-binding surface of chaperone site in the chaperone activity of trigger factor.
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Affiliation(s)
- Dongjie Fan
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
- State Key Laboratory of Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Shunan Cao
- Key Laboratory for Polar Science, State Ocean Administration, Polar Research Institute of China, Shanghai, China
| | - Qiming Zhou
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
- ChosenMed Technology Company Limited, Jinghai Industrial Park, Economic and Technological Development Area, Beijing, China
| | - You Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Lei Yue
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Chang Han
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Bo Yang
- School of Life Sciences, Nantong University, Nantong, Jiangsu, China
| | - Yu Wang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Zhuo Ma
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Lingxiang Zhu
- National Research Institute for Family Planning (NRIFP), Beijing, China
| | - Chuanpeng Liu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
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Yang G, Yu X, Wu Z, Xu J, Song L, Zhang H, Hu X, Zheng N, Guo L, Xu J, Dai J, Ji C, Gu S, Ying K. Molecular cloning and characterization of a novel adenylate kinase 3 gene from Clonorchis sinensis. Parasitol Res 2005; 95:406-12. [PMID: 15747033 DOI: 10.1007/s00436-005-1305-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2004] [Accepted: 12/20/2004] [Indexed: 11/24/2022]
Abstract
Adenylate kinase (AK) is a ubiquitous enzyme that contributes to the homeostasis of adenine nucleotides in living cells. AK catalyzes reversible high energy phosphoryl transfer reactions between ATP (or GTP) and AMP to generate ADP (or GDP). From a Clonorchis sinensis adult worm cDNA library, we isolated a cDNA clone encoding a novel AK3 isozyme. The 956 bp cDNA encodes a putative protein of 228 amino acids with a predicted molecular mass of 26.2 kDa. The recombinant CsAK3 protein produced in Escherichia coli can be refolded into a functional protein with AK3 activity. The optimum pH and temperature for the enzyme are 8.5 and 40 degrees C, respectively. The calculated activation energy is 56.04 kJ mol-1. The Km of the CsAK3 for AMP and GTP are 118 microM and 359 microM, respectively. CsAK3 is inhibited by Ap5A (>70% inhibition by 2.0 mM AP5A). Ap5A may be a potential lead compound acting on C. sinensis in which AK3 as a drug target.
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Affiliation(s)
- Guang Yang
- Department of Parasitology, Medical School, Sun Yat-Sen University, 74 Zhongshan 2 Road, 510089, Guangzhou , P.R. China.
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Duclohier H. Helical kink and channel behaviour: a comparative study with the peptaibols alamethicin, trichotoxin and antiamoebin. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2004; 33:169-74. [PMID: 15014907 DOI: 10.1007/s00249-003-0383-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2003] [Revised: 12/04/2003] [Accepted: 12/12/2003] [Indexed: 11/30/2022]
Abstract
Kinks or bends introduced in peptides and proteins by "helical distorter" residues such as proline, other imino acids and glycine, especially when these are in close proximity in the sequence, are increasingly recognized as playing an essential role in the gating of channel-forming peptides as well as of physiological ion channels. Peptaibols are useful simple models for the much more complex biological ion channels, especially voltage-gated ones. In this short review, we compare the monomeric structures of three selected peptaibols (alamethicin, trichotoxin and antiamoebin) that widely differ with regards their near-central kink angles and dipolar moment orientations. These structural features are then shown to be correlated to the different patterns of channel activity, both at the macroscopic and single-channel levels of investigation.
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Affiliation(s)
- H Duclohier
- Interactions Cellulaires et Moléculaires, UMR 6026 CNRS, Université de Rennes I, 35042 Cedex, Rennes, France.
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