GATA transcription factors play a crucial role in the regulation of immune functions across metazoans. In Caenorhabditis elegans , the GATA transcription factor ELT-2 is involved in the control of not only infections but also recovery after an infection. We identified RPT-6, part of the 19S proteasome subunit, as an ELT-2 binding partner that is required for the proper expression of genes required for both immunity against bacterial infections and recovery after infection. We found that the intact ATPase domain of RPT-6 is required for the interaction and that inhibition of rpt-6 affected the expression of ELT-2-controlled genes, preventing the appropriate immune response against Pseudomonas aeruginosa and recovery from infection by the pathogen. Further studies indicated that SKN-1, which is an Nrf transcription factor involved in the response to oxidative stress and infection, is activated by inhibition of rpt-6 . Our results indicate that RPT-6 interacts with ELT-2 in vivo to control the expression of immune genes in a manner that is likely independent of the proteolytic activity of the proteasome. Author summary The conserved GATA transcription factor ELT-2 plays an important role in the control of genes required for both defense and recovery from infection. We show that RPT-6, a component of the 19S subunit, physically interacts with ELT-2 in vivo , controlling the expression of ELT-2-dependent genes and the response of the nematode Caenorhabditis elegans to bacterial infection. The proteolytic activity of the proteasome has surfaced as a key regulator of gene expression, but our results provide evidence indicating that a non-canonical activity of the 26S proteasome subunit plays an important role in the control of gene expression during the response to bacterial infection.
【초록키워드】 immune response, Gene Expression, Immunity, Infection, oxidative stress, pathogen, Bacterial infection, immune function, in vivo, expression, Bacterial infections, binding, Evidence, Interaction, Pseudomonas aeruginosa, transcription factor, Caenorhabditis elegans, transcription factors, independent of, Regulation, subunit, domain, proteolytic activity, component, Defense, GATA transcription factor, GATA transcription factors, immune functions, immune genes, proteasome, ATPase, Genes, independent, immune gene, affected, physically, conserved, involved, indicated, required, activated, interact, Caenorhabditis elegan, expression of gene, 【제목키워드】 Transcription, Infection, regulate, subunit, GATA,