Abstract:
:SUMOylation is a post-translational modification that positively regulates monoallelic expression of the trypanosome variant surface glycoprotein (VSG). The presence of a highly SUMOylated focus associated with the nuclear body, where the VSG gene is transcribed, further suggests an important role of SUMOylation in regulating VSG expression. Here, we show that SNF2PH, a SUMOylated plant homeodomain (PH)-transcription factor, is upregulated in the bloodstream form of the parasite and enriched at the active VSG telomere. SUMOylation promotes the recruitment of SNF2PH to the VSG promoter, where it is required to maintain RNA polymerase I and thus to regulate VSG transcript levels. Further, ectopic overexpression of SNF2PH in insect forms, but not of a mutant lacking the PH domain, induces the expression of bloodstream stage-specific surface proteins. These data suggest that SNF2PH SUMOylation positively regulates VSG monoallelic transcription, while the PH domain is required for the expression of bloodstream-specific surface proteins. Thus, SNF2PH functions as a positive activator, linking expression of infective form surface proteins and VSG regulation, thereby acting as a major regulator of pathogenicity.
journal_name
EMBO Repjournal_title
EMBO reportsauthors
Saura A,Iribarren PA,Rojas-Barros D,Bart JM,López-Farfán D,Andrés-León E,Vidal-Cobo I,Boehm C,Alvarez VE,Field MC,Navarro Mdoi
10.15252/embr.201948029subject
Has Abstractpub_date
2019-12-05 00:00:00pages
e48029issue
12eissn
1469-221Xissn
1469-3178journal_volume
20pub_type
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