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3. List of contributors

Author

Abdulhussein, Dalia, primary, Abraham, Abu, additional, Agrahari, Vivek, additional, Amrane, Mourad, additional, Ayyagari, Ananta, additional, Buchholzer, Franz, additional, Chastain, James E., additional, Chen, Chiungkuang, additional, Cheng, Andy K., additional, Chia, Audrey, additional, Cordeiro, M. Francesca, additional, Daull, Philippe, additional, deLong, Mitchell A., additional, Foo, Li Lian, additional, Gudibanda, Pooja, additional, Herwig-Carl, Martina C., additional, Huang, Alex A., additional, Husain, Shahid, additional, Idigo, Chinenye, additional, Koizumi, Schuichi, additional, Kosoko-Lasaki, Sade, additional, Kuhn, Megan S., additional, Kundu, Aishwarya, additional, Lamb, William D.B., additional, Leung, Alex, additional, Li, Yu Meng, additional, Limb, G. Astrid, additional, Loeffler, Karin U., additional, Luthert, Phil, additional, Makley, Leah, additional, Manzar, Haider, additional, McDonnell, Fiona S., additional, McKoy, Marshalyn G., additional, Miyake, Hideki, additional, Mohanty, Samarendra, additional, Mudumba, Sreenivasu, additional, Muili, Fatima, additional, Narcisse, Darryl, additional, Ng, Wei Yan, additional, Ngele, Kalu K., additional, Njie-Mbye, Ya Fatou, additional, Ohia, Sunny E., additional, Ohia-Nwoko, Odochi, additional, Ohnuma, Shin-ichi, additional, Okolie, Anthonia, additional, Opere, Catherine A., additional, Pinchuk, Leonard, additional, Raola, Akash, additional, Sadruddin, Omar, additional, Sharif, Najam A., additional, Shibagaki, Keiichi, additional, Shinozaki, Youichi, additional, Singh, Onkar N., additional, Stamer, W. Daniel, additional, Stradiotto, Allison, additional, Sturdivant, Jill, additional, Toshimori, Masanao, additional, Yacoub, Sam, additional, Yalzadeh, Dariush, additional, Yap, Timothy E., additional, Yerxa, Benjamin R., additional, and Zode, Gulab, additional

Published
2022
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7. Structural and Biophysical Characterization of Variants of the Mechanosensitive Channel of Large Conductance (MsCL)

Author

Idigo, Chinenye Abiodun, Idigo, Chinenye Abiodun, Idigo, Chinenye Abiodun, and Idigo, Chinenye Abiodun

Abstract

The ability to sense mechanical force is vital to all organisms to interact with and respond to stimuli in their environment. Mechanosensation is critical to many physiological functions such as the senses of hearing and touch in animals, gravitropism in plants and osmoregulation in bacteria. Of these processes, the best understood at the molecular level involve bacterial mechanosensitive channels. Under hypo-osmotic stress, bacteria are able to alleviate turgor pressure through mechanosensitive channels that gate directly in response to tension in the membrane lipid bilayer. A key participant in this response is the mechanosensitive channel of large conductance (MscL), a non-selective channel with a high conductance of ~3 nS that gates at tensions close to the membrane lytic tension. It has been appreciated since the original discovery by C. Kung that the small subunit size (~130 to 160 residues) and the high conductance necessitate that MscL forms a homo-oligomeric channel. Over the past 20 years of study, the proposed oligomeric state of MscL has ranged from monomer to hexamer. Oligomeric state has been shown to vary between MscL homologues and is influenced by lipid/detergent environment. In this thesis, we report the creation of a chimera library to systematically survey the correlation between MscL sequence and oligomeric state to identify the sequence determinants of oligomeric state. Our results demonstrate that although there is no combination of sequences uniquely associated with a given oligomeric state (or mixture of oligomeric states), there are significant correlations. In the quest to characterize the oligomeric state of MscL, an exciting discovery was made about the dynamic nature of the MscL complex. We found that in detergent solution, under mild heating conditions (37 °C – 60 °C), subunits of MscL can exchange between complexes, and the dynamics of this process are sensitive to the protein sequence. Extensive efforts were made to

Published
2015

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