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UID:1230@biology.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20240702T130000

DTEND;TZID=Asia/Jerusalem:20240702T140000

DTSTAMP:20240619T075457Z

URL:https://biology.technion.ac.il/en/seminars/phd-graduate-seminar-ariel-
 chazan/

SUMMARY:PhD Graduate Seminar- Ariel Chazan [No Categories]
DESCRIPTION:Location:  Hybrid- in the Faculty Auditorium/ZOOM:  https://tec
 hnion.zoom.us/j/92872187327?pwd=DJMB4HKa34c56RjBhCev6KB1fHL87D.1  Ariel Ch
 azan\n Affiliation: \n Host:Prof. Oded Beja  \n Mixing up the colors of th
 e seas:\nPhototrophy by antenna-containing rhodopsins in aquatic environme
 nts\n\nRhodopsin-based phototrophy is one of the two known ways by which m
 icroorganisms harvest sunlight energy. More than 50% of bacteria in the oc
 ean's surface contain a rhodopsin gene. Rhodopsins are defined as a two-co
 mponent system (protein + retinal) that relies on the retinal to capture s
 unlight energy. In two exotic and rare bacteria\, rhodopsins were demonstr
 ated to bind an additional antenna composed of a carotenoid molecule that 
 captures additional light and enhances the activity of the complex. Such r
 hodopsins have been known for almost 20 years\, yet the isolated cases of 
 a rhodopsin-carotenoid complex remained a curious phenomenon of marginal e
 cological significance.\n\nIn this project\, we designed a novel workflow 
 that uses environmental samples to pull out from a native pool of caroteno
 ids the ones that might serve as antennas for rhodopsin. Surprisingly\, us
 ing this methodology\, we discovered that the ability of rhodopsins to bin
 d carotenoid antennas appears to be widespread in nature. We demonstrate t
 hat these antennas can significantly enhance rhodopsin activity\; moreover
 \, we predict that over a third of the rhodopsins found in aquatic microbe
 s can potentially utilize a carotenoid antenna to capture additional light
  energy. These antennas were neglected for almost 20 years\; we now unders
 tand that they may have a substantial impact on rhodopsin-mediated phototr
 ophy in the world’s lakes\, seas and oceans. 
LOCATION: Hybrid- in the Faculty Auditorium/ZOOM:  https://technion.zoom.us
 /j/92872187327?pwd=DJMB4HKa34c56RjBhCev6KB1fHL87D.1

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