Unusual diversity in alpha-amanitin sensitivity of RNA polymerases in trichomonads

. 2001 Jul ; 115 (2) : 239-47.

Jazyk angličtina Země Nizozemsko Médium print

Typ dokumentu časopisecké články, práce podpořená grantem, Research Support, U.S. Gov't, P.H.S.

Perzistentní odkaz   https://www.medvik.cz/link/pmid11420110

Grantová podpora
AI28798 NIAID NIH HHS - United States

Odkazy

PubMed 11420110
DOI 10.1016/s0166-6851(01)00294-8
PII: S0166-6851(01)00294-8
Knihovny.cz E-zdroje

Previous studies in the parasitic protist Trichomonas vaginalis have revealed that protein coding genes are transcribed by an alpha-amanitin-resistant RNA polymerase (RNAP) II. To investigate whether this unusual property is a general characteristic of trichomonads, we addressed the physiology of RNA synthesis in lysolecithin-permeabilized cells. Unlike in T. vaginalis, RNAP II in Tritrichomonas foetus was highly sensitive to the inhibitor alpha-amanitin. On the other hand, RNAP III, identified by its sensitivity to the specific inhibitor tagetitoxin, was found to be resistant to alpha-amanitin in Tritrichomonas foetus, but showed a typical intermediate sensitivity in T. vaginalis. Extension of this study to an additional seven trichomonad species confirmed this genera specific pattern of alpha-amanitin sensitivity and highlighted an unusual diversity in RNAPs among trichomonads, a closely related group of unicellular eukaryotes.

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