Altered expression of an RBP-associated arginine methyltransferase 7 in Leishmania major affects parasite infection

Autor(es)

Ferreira, Tiago R. ^[1] ; Alves-Ferreira, Eliza V. C. ^[1] ; Defina, Tania P. A. ^[1] ; Walrad, Pegine ^[2] ; Papadopoulou, Barbara ^[3] ; Cruz, Angela K. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Cell & Mol Biol, BR-14049 Ribeirao Preto - Brazil

^[2] Univ York, Dept Biol, Ctr Immunol & Infect, York YO10 5DD, N Yorkshire - England

^[3] Univ Laval, Fac Med, CHU Quebec Res Ctr CHUL, Res Ctr Infect Dis, Quebec City, PQ G1K 7P4 - Canada

• Tipo de documento: Artigo Científico
• Fonte: Molecular Microbiology; v. 94, n. 5, p. 1085-1102, DEC 2014.
• Citações Web of Science: 12

Resumo

Protein arginine methylation is a widely conserved post-translational modification performed by arginine methyltransferases (PRMTs). However, its functional role in parasitic protozoa is still under-explored. The Leishmania major genome encodes five PRMT homologs, including PRMT7. Here we show that LmjPRMT7 expression and arginine monomethylation are tightly regulated in a lifecycle stage-dependent manner. LmjPRMT7 levels are higher during the early promastigote logarithmic phase, negligible at stationary and late-stationary phases and rise once more post-differentiation to intracellular amastigotes. Immunofluorescence and co-immunoprecipitation studies demonstrate that LmjPRMT7 is a cytosolic protein associated with several RNA-binding proteins (RBPs) from which Alba20 is monomethylated only in LmjPRMT7-expressing promastigote stages. In addition, Alba20 protein levels are significantly altered in stationary promastigotes of the LmjPRMT7 knockout mutant. Considering RBPs are well-known mammalian PRMT substrates, our data suggest that arginine methylation via LmjPRMT7 may modulate RBP function during Leishmania spp. lifecycle progression. Importantly, genomic deletion of the LmjPRMT7 gene leads to an increase in parasite infectivity both in vitro and in vivo, while lesion progression is significantly reduced in LmjPRMT7-overexpressing parasites. This study is the first to describe a role of Leishmania protein arginine methylation in host-parasite interactions. (AU)

• Processo FAPESP: 11/02040-4 - Investigação do papel da Prostaglandina F2-alfa sintase na interação entre Leishmania braziliensis e hospedeiro
• Beneficiário: Eliza Vanessa Carneiro Alves Ferreira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/01129-9 - Investigação da função da Arginina Metiltransferase LmjPRMT7 no controle da expressão gênica em Leishmania major
• Beneficiário: Tiago Rodrigues Ferreira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/20597-3 - Investigação da interação parasito-hospedeiro: explorando modelos de estudo de virulência e tropismo
• Beneficiário: Angela Kaysel Cruz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/50323-7 - Estudo do controle da expressão gênica e plasticidade genética em Leishmania
• Beneficiário: Angela Kaysel Cruz
• Modalidade de apoio: Auxílio à Pesquisa - Temático