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DTSTART:19960101T000000 END:STANDARD BEGIN:STANDARD TZNAME:GMT TZOFFSETFROM:+0100 TZOFFSETTO:+0000 DTSTART:19961027T020000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260503T183352Z DTSTART;VALUE=DATE-TIME:20250725T133000 DTEND;VALUE=DATE-TIME:20250725T143000 SUMMARY:Cellular Interfaces Seminar: Gap junctions at the membrane and th e space beneath? Professor Ramanathan Sowdhamini\, National Centre for B iological Sciences (TIFR)\, Bangalore TZID:Europe/London UID:20250725-8ac672c798095a1c0198095c5d7e003c@warwick.ac.uk CREATED:20250724T102621Z DESCRIPTION:Abstract: Protein-protein interactions are crucial for carryi ng out biological functions and for regulating activities. I will be pre senting two stories in this direction: membrane-bound channels and the a ctin-tropomyosin matrix proteins. Gap junction proteins orchestrate acro ss cells to form channels that permit cytosolic molecules such as glutam ate and ATP to leak into the extracellular medium. Innexins in worms and connexins in eukaryotes belong to this superfamily to perform these fun ctions. Interestingly\, despite their functional similarities\, their ol igomeric states are different. Innexins form octamers\, while connexins for hexamers. Pannexins are intermediate sequences which form only hepta meric hemichannels\, but not functional channels. We asked a general que stion about the oligomeric preferences of the superfamily members by sim ply threading the alternate quaternary states and compared the interface psuedoenergies through an in-house algorithm called PPCheck (Sukhwal an d Sowdhamini\, 2015). There are various isomers of these proteins and we also examined few combinations of oligomers through modelling approache s. Results indicate that considerable specificity is achieved through N- terminal loop regions and hemi-channel interfaces. Actin-tropomyosin int eractions are crucial for biological processes such as muscle contractio n including cardiac muscles. Whereas the coiled-coil of human tropomyosi n\, TPM1\, interacts with seven molecules of actin\, all along its perio ds of heptad repeats\, we examined shorter length tropomyosins (such as TPM4 and yeast homologue which binds to only four actins) through succes sive docking and energy calculations to compare the actin-tropomyosin in terface. I will discuss the results which indicate shorter length tropom yosins bind more strongly at the heptads. These might be compensatory me chanisms to combat the length differences. It will be interesting to fol low on biophysical validations and the functional basis of length variat ions amongst homologous proteins. LOCATION:A151\, Medical School Building CATEGORIES:BiomedicalSciences,Cellular Interfaces Seminar LAST-MODIFIED:20250724T102621Z ORGANIZER;CN=Jas Bains: END:VEVENT END:VCALENDAR