title: Proof of interaction between Leishmania SIR2RP1 deacetylase and chaperone HSP83.
abstract: The cytoplasmic Leishmania silent information regulator 2 (SIR2)RP1 protein is essential for parasite growth and survival and constitutes an attractive therapeutic target. Little information is available on putative substrate(s) and/or partner(s) that could shed light on the pathways in which this enzyme plays a role. We carried out co-immunoprecipitation experiments on the soluble fractions of wild-type and parasites overexpressing LmSIR2RP1 and found that the essential chaperone heat shock protein (HSP) 83, the Leishmania ortholog of the mammalian HSP90, constantly co-immunoprecipitated with LmSIR2RP1. We found that Leishmania HSP83 is among the lysine acetylated protein, but the intracellular level of SIR2RP1 does not influence the acetylation status of HSP83. Finally, the modified Geldanamycin susceptibility (an inhibitor of HSP83) exhibited by SIR2RP1 mutant parasites support an in vivo relationship between the chaperone activity of HSP83 and LmSIR2RP1. An insight on the nature of the interaction in Leishmania is required to understand its role in the cell fate control during cytodifferentiation.
authors.affiliation: UR008 Pathogénie des Trypanosomatidés, Centre IRD de Montpellier, 911 Avenue Agropolis, Montpellier, 34394, France.
authors.forename: Monte-Alegre
authors.initials: MA
authors.lastname: Adriano
authors.forename: Baptiste
authors.initials: B
authors.lastname: Vergnes
authors.forename: Joel
authors.initials: J
authors.lastname: Poncet
authors.forename: Françoise
authors.initials: F
authors.lastname: Mathieu-Daude
authors.forename: Anabela Cordeiro
authors.initials: AC
authors.lastname: da Silva
authors.forename: Ali
authors.initials: A
authors.lastname: Ouaissi
authors.forename: Denis
authors.initials: D
authors.lastname: Sereno
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005786:Gene Expression Regulation; D006360:Heat-Shock Proteins / Q000378:metabolism*; D007891:Leishmania / Q000201:enzymology*; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D015800:Protozoan Proteins / Q000378:metabolism*
chemical_list: D006360:Heat-Shock Proteins; C490310:Hsp83 protein, protozoan; D009687:Nuclear Proteins; D015800:Protozoan Proteins