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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Structural and functional studies of the Leishmania braziliensis SGT co-chaperone indicate that it shares structural features with HIP and can interact with both Hsp90 and Hsp70 with similar affinities

Texto completo
Autor(es):
Coto, Amanda L. S. [1] ; Seraphim, Thiago V. [1] ; Batista, Fernanda A. H. [1] ; Dores-Silva, Paulo R. [1] ; Barranco, Ana Beatriz F. [1] ; Teixeira, Felipe R. [2] ; Gava, Lisandra M. [2] ; Borges, Julio C. [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Ctr Biol & Hlth Sci, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: International Journal of Biological Macromolecules; v. 118, n. A, p. 693-706, OCT 15 2018.
Citações Web of Science: 1
Resumo

Molecular chaperones and co-chaperones play an essential role in the life cycles of protozoa belonging to the genus Leishmania. The small glutamine-rich TPR-containing protein (SGT) is a co-chaperone that can be divided into three domains: N-terminal, tetratricopeptide (TPR) and C-terminal. The TPR domain is responsible for interactions with both Hsp70 and Hsp90; however, the mechanism of interaction and the functionality of SGT are unclear. In this context, we present the structural and functional characterization of Leishmania braziliensis SGT (LbSGT), aiming to elucidate how this co-chaperone interacts with the Hsp90/Hsp70 chaperone machinery. Structurally, the recombinant LbSGT behaves as an alpha-helical, multidomain and elongated dimer in solution. Despite their low amino acid sequence identity and similarity, LbSGT shares structural properties and domain organization with the Hsp70-interacting protein (HIP) co-chaperone. Functionally, LbSGT is a cognate protein in L. braziliensis promastigote cells and interacts indiscriminately, with similar affinities, with both Hsp90 and Hsp70 chaperones, capable of working as an adaptor protein. Sequence analysis indicates that LbSGT interacts via a dicarboxylate clamp, the same mechanism used by the Hsp90-Hsp70-organizing protein (HOP) cochaperone. These results suggest that SGT can develop the same function as HOP but using the HIP structural scaffold. (C) 2018 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/07206-6 - Estudos da HSP70 mitocondrial de humanos e de protozoários: abordagem estrutural e funcional
Beneficiário:Julio Cesar Borges
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 17/07335-9 - Estudos das isoformas da HSP70 humana residentes no citoplasma e mitocôndria e de seus oligômeros de alta massa molecular: interação com co-chaperonas e proteínas clientes
Beneficiário:Julio Cesar Borges
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/50161-8 - Estudo da estrutura e função da chaperona Hsp90 com ênfase no seu papel em homeostase celular
Beneficiário:Carlos Henrique Inacio Ramos
Linha de fomento: Auxílio à Pesquisa - Temático