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Yang N, Fan X, Yu W, Huang Y, Yu C, Konno K, Dong X. Effects of microbial transglutaminase on gel formation of frozen-stored longtail southern cod (Patagonotothen ramsayi) mince. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109444] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Gallagher EE, Song JM, Menon A, Mishra LD, Chmiel AF, Garner AL. Consideration of Binding Kinetics in the Design of Stapled Peptide Mimics of the Disordered Proteins Eukaryotic Translation Initiation Factor 4E-Binding Protein 1 and Eukaryotic Translation Initiation Factor 4G. J Med Chem 2019; 62:4967-4978. [PMID: 31033289 PMCID: PMC6679956 DOI: 10.1021/acs.jmedchem.9b00068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Protein disorder plays a crucial role in signal transduction and is key for many cellular processes including transcription, translation, and cell cycle. Within the intrinsically disordered protein interactome, the α-helix is commonly used for binding, which is induced via a disorder-to-order transition. Because the targeting of protein-protein interactions (PPIs) remains an important challenge in medicinal chemistry, efforts have been made to mimic this secondary structure for rational inhibitor design through the use of stapled peptides. Cap-dependent mRNA translation is regulated by two disordered proteins, 4E-BP1 and eIF4G, that inhibit or stimulate the activity of the m7G cap-binding translation initiation factor, eIF4E, respectively. Both use an α-helical motif for eIF4E binding, warranting the investigation of stapled peptide mimics for manipulating eIF4E PPIs. Herein, we describe our efforts toward this goal, resulting in the synthesis of a cell-active stapled peptide for further development in manipulating aberrant cap-dependent translation in human diseases.
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Affiliation(s)
- Erin E Gallagher
- Department of Medicinal Chemistry, College of Pharmacy , University of Michigan , 1600 Huron Parkway, NCRC B520 , Ann Arbor , Michigan 48109 , United States
| | - James M Song
- Program in Chemical Biology , University of Michigan , 210 Washtenaw Avenue , Ann Arbor , Michigan 48109 , United States
| | - Arya Menon
- Department of Medicinal Chemistry, College of Pharmacy , University of Michigan , 1600 Huron Parkway, NCRC B520 , Ann Arbor , Michigan 48109 , United States
| | - Lauren D Mishra
- Department of Medicinal Chemistry, College of Pharmacy , University of Michigan , 1600 Huron Parkway, NCRC B520 , Ann Arbor , Michigan 48109 , United States
| | - Alyah F Chmiel
- Department of Medicinal Chemistry, College of Pharmacy , University of Michigan , 1600 Huron Parkway, NCRC B520 , Ann Arbor , Michigan 48109 , United States
| | - Amanda L Garner
- Department of Medicinal Chemistry, College of Pharmacy , University of Michigan , 1600 Huron Parkway, NCRC B520 , Ann Arbor , Michigan 48109 , United States
- Program in Chemical Biology , University of Michigan , 210 Washtenaw Avenue , Ann Arbor , Michigan 48109 , United States
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Liu Y, Yang M, Cheng H, Sun N, Liu S, Li S, Wang Y, Zheng Y, Uversky VN. The effect of phosphorylation on the salt-tolerance-related functions of the soybean protein PM18, a member of the group-3 LEA protein family. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2017; 1865:1291-1303. [PMID: 28867216 DOI: 10.1016/j.bbapap.2017.08.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 08/08/2017] [Accepted: 08/27/2017] [Indexed: 12/29/2022]
Abstract
Enzymatically driven post-translated modifications (PTMs) usually happen within the intrinsically disordered regions of a target protein and can modulate variety of protein functions. Late embryogenesis abundant (LEA) proteins are a family of the plant intrinsically disordered proteins (IDPs). Despite their important roles in plant stress response, there is currently limited knowledge on the presence and functional and structural effects of phosphorylation on LEA proteins. In this study, we identified three phosphorylation sites (Ser90, Tyr136, and Thr266) in the soybean PM18 protein that belongs to the group-3 LEA proteins. In yeast expression system, PM18 protein increased the salt tolerance of yeast, and the phosphorylation of this protein further enhanced its protective function. Further analysis revealed that Ser90 and Tyr136 are more important than Thr266, and these two sites might work cooperatively in regulating the salt resistance function of PM18. The circular dichroism analysis showed that PM18 protein was disordered in aqueous media, and phosphorylation did not affect the disordered status of this protein. However, phosphorylation promoted formation of more helical structure in the presence of sodium dodecyl sulfate (SDS) or trifluoroethanol (TFE). Furthermore, in dedicated in vitro experiments, phosphorylated PM18 protein was able to better protect lactate dehydrogenase (LDH) from the inactivation induced by the freeze-thaw cycles than its un- or dephosphorylated forms. All these data indicate that phosphorylation may have regulatory effects on the stress-tolerance-related function of LEA proteins. Therefore, further studies are needed to shed more light on functional and structural roles of phosphorylation in LEA proteins.
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Affiliation(s)
- Yun Liu
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China.
| | - Meiyan Yang
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China
| | - Hua Cheng
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China
| | - Nan Sun
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China
| | - Simu Liu
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China
| | - Shuiming Li
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China
| | - Yong Wang
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China
| | - Yizhi Zheng
- Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Nanhai Ave 3688, Shenzhen, Guangdong 518060, China.
| | - Vladimir N Uversky
- Department of Molecular Medicine and USF Health Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, 12901 Bruce B. Downs Blvd. MDC07, Tampa, FL, USA; Laboratory of New Methods in Biology, Institute for Biological Instrumentation, Russian Academy of Sciences, Institutskaya str., 7, Pushchino, Moscow region 142290, Russia; Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky Ave., St. Petersburg 194064, Russia.
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Tiffany H, Sonkar K, Gage MJ. The insertion sequence of the N2A region of titin exists in an extended structure with helical characteristics. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1865:1-10. [PMID: 27742555 DOI: 10.1016/j.bbapap.2016.10.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 10/05/2016] [Accepted: 10/07/2016] [Indexed: 12/15/2022]
Abstract
The giant sarcomere protein titin is the third filament in muscle and is integral to maintaining sarcomere integrity as well as contributing to both active and passive tension. Titin is a multi-domain protein that contains regions of repeated structural elements. The N2A region sits at the boundary between the proximal Ig region of titin that is extended under low force and the PEVK region that is extended under high force. Multiple binding interactions have been associated with the N2A region and it has been proposed that this region acts as a mechanical stretch sensor. The focus of this work is a 117 amino acid portion of the N2A region (N2A-IS), which resides between the proximal Ig domains and the PEVK region. Our work has shown that the N2A-IS region is predicted to contain helical structure in the center while both termini are predicted to be disordered. Recombinantly expressed N2A-IS protein contains 13% α-helical structure, as measured via circular dichroism. Additional α-helical structure can be induced with 2,2,2-trifluoroethanol, suggesting that there is transient helical structure that might be stabilized in the context of the entire N2A region. The N2A-IS region does not exhibit any cooperativity in either thermal or chemical denaturation studies while size exclusion chromatography and Fluorescence Resonance Energy Transfer demonstrates that the N2A-IS region has an extended structure. Combined, these results lead to a model of the N2A-IS region having a helical core with extended N- and C-termini.
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Affiliation(s)
- Holly Tiffany
- Department of Biology, Northern Arizona University, Flagstaff, AZ, United States
| | - Kanchan Sonkar
- Department of Chemistry and Biochemistry, Northern Arizona University, Flagstaff, AZ, United States
| | - Matthew J Gage
- Department of Chemistry and Biochemistry, Northern Arizona University, Flagstaff, AZ, United States; Center for Bioengineering Innovation, Northern Arizona University, Flagstaff, AZ, United States; Department of Chemistry, University of Massachusetts Lowell, Lowell, MA, United States.
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