The BBSome restricts entry of tagged carbonic anhydrase 6 into the cis-flagellum of Chlamydomonas reinhardtii.

Autor: Yu K; Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America., Liu P; Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America., Venkatachalam D; Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America., Hopkinson BM; Department of Marine Sciences, University of Georgia, Athens, Georgia, United States of America., Lechtreck KF; Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2020 Oct 29; Vol. 15 (10), pp. e0240887. Date of Electronic Publication: 2020 Oct 29 (Print Publication: 2020).
DOI: 10.1371/journal.pone.0240887
Abstrakt: The two flagella of Chlamydomonas reinhardtii are of the same size and structure but display functional differences, which are critical for flagellar steering movements. However, biochemical differences between the two flagella have not been identified. Here, we show that fluorescence protein-tagged carbonic anhydrase 6 (CAH6-mNG) preferentially localizes to the trans-flagellum, which is organized by the older of the two flagella-bearing basal bodies. The uneven distribution of CAH6-mNG is established early during flagellar assembly and restored after photobleaching, suggesting that it is based on preferred entry or retention of CAH6-mNG in the trans-flagellum. Since CAH6-mNG moves mostly by diffusion, a role of intraflagellar transport (IFT) in establishing its asymmetric distribution is unlikely. Interestingly, CAH6-mNG is present in both flagella of the non-phototactic bardet-biedl syndrome 1 (bbs1) mutant revealing that the BBSome is involved in establishing CAH6-mNG flagellar asymmetry. Using dikaryon rescue experiments, we show that the de novo assembly of CAH6-mNG in flagella is considerably faster than the removal of ectopic CAH6-mNG from bbs flagella. Thus, different rates of flagellar entry of CAH6-mNG rather than its export from flagella is the likely basis for its asymmetric distribution. The data identify a novel role for the C. reinhardtii BBSome in preventing the entry of CAH6-mNG specifically into the cis-flagellum.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje