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Liu Y, Pan H, Wang H, Yuan Y, Cao F, Song W, Wang Z. Mutations in the NDV fusion protein HR4 region decreased fusogenic activity due to failed protein expression. Microb Pathog 2024; 192:106713. [PMID: 38810765 DOI: 10.1016/j.micpath.2024.106713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 04/28/2024] [Accepted: 05/24/2024] [Indexed: 05/31/2024]
Abstract
Newcastle disease virus (NDV) is the pathogen of a zoonosis that is primarily transmitted by poultry and has severe infectivity and a high fatality rate. Many studies have focused on the role of the NDV fusion (F) protein in the cell-cell membrane fusion process. However, little attention has been given to the heptad repeat region, HR4, which is located in the NDV F2 subunit. Here, site-directed mutants were constructed to study the function of the NDV F protein HR4 region and identify the key amino acids in this region. Nine conserved amino acids were substituted with alanine or the corresponding amino acid of other aligned paramyxoviruses. The desired mutants were examined for changes in fusogenic activity through three kinds of membrane fusion assays and expression and proteolysis through IFA, FACS and WB. The results showed that when conserved amino acids (L81, Y84, L88, L91, L92, P94, L95 and I99) were replaced with alanine, the fusogenic activity of the F protein was abolished, possibly because of failed protein expression not only on the cell surface but also inside cells. These data indicated that the conserved amino acids above in NDV F HR4 are critical for normal protein synthesis and expression, possibly for the stability of the F protein monomer, formation of trimer and conformational changes.
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Affiliation(s)
- Yaqing Liu
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China; Department of Virology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, 250014, China
| | - Huazheng Pan
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
| | - Hongwei Wang
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
| | - Yuan Yuan
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
| | - Fangfang Cao
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
| | - Wei Song
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
| | - Zhiyu Wang
- Department of Virology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, 250014, China.
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Elafify MS, Itagaki T, Elkasabgy NA, Sayed S, Ito Y, Ueda M. Reversible transformation of peptide assembly between densified-polysarcosine-driven kinetically and helix-orientation-driven thermodynamically stable morphologies. Biomater Sci 2023; 11:6280-6286. [PMID: 37548917 DOI: 10.1039/d3bm00714f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Stimuli-responsive transformable biomaterials development can be manipulated practically by fine-tuning the built-in molecular design of their structural segments. Here, we demonstrate a peptide assembly by the bola-type amphiphilic polypeptide, glycolic acid-polysarcosine (PSar)13-b-(L-Leu-Aib)6-b-PSar13-glycolic acid (S13L12S13), which shows morphological transformations between hydrophilic chain-driven and hydrophobic unit-driven morphologies. The hydrophobic α-helical unit (L-Leu-Aib)6 precisely controls packing in the hydrophobic layer of the assembly and induces tubule formation. The densified, hydrophilic PSar chain on the assembly surface becomes slightly more hydrophobic as the temperature increases above 70 °C, starting to disturb the helix-helix interaction-driven formation of tubules. As a result, the S13L12S13 peptide assembly undergoes a reversible vesicle-nanotube transformation following a time course at room temperature and a heat treatment above 80 °C. Using membrane fluidity analysis with DPH and TMA-DPH and evaluating the environment surrounding the PSar side chain with NMR, we clarify that the vesicle was in a kinetically stable state driven by the dehydrated PSar chain, while the nanotube was in a thermodynamically stable state.
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Affiliation(s)
- Mohamed S Elafify
- RIKEN Cluster for Pioneering Research (CPR), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo 11562, Egypt
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Menoufia University, Gamal Abdel El-Nasr Street, Shebin El-Kom, Menoufia 32511, Egypt
| | - Toru Itagaki
- RIKEN Cluster for Pioneering Research (CPR), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
| | - Nermeen A Elkasabgy
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo 11562, Egypt
| | - Sinar Sayed
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo 11562, Egypt
| | - Yoshihiro Ito
- RIKEN Cluster for Pioneering Research (CPR), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
- RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Motoki Ueda
- RIKEN Cluster for Pioneering Research (CPR), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
- RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Itagaki T, Ito Y, Ueda M. Peptide flat-rod formation by precise arrangement among enantiomeric hydrophobic helices. J Colloid Interface Sci 2022; 617:129-135. [DOI: 10.1016/j.jcis.2022.02.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/16/2022] [Accepted: 02/28/2022] [Indexed: 11/15/2022]
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