Structure prediction and functional analysis of a non-permutated lectin from Dioclea grandiflora.

Autor: de Sousa BL; Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil; Departamento de Física, Universidade Federal do Ceará, 60455-760, Fortaleza, Ceará, Brazil. Electronic address: brunolopesdesousa@gmail.com., Nagano CS; Departamento de Engenharia de Pesca, Universidade Federal do Ceará, 60455-760, Fortaleza, Ceará, Brazil. Electronic address: naganocs@gmail.com., Simões RD; Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil; Centro de Ciências Biológicas e da Saúde, Universidade Federal do Oeste da Bahia, Rua Professor José Seabra de Lemos, 316, 47808-021, Barreiras, Bahia, Brazil. Electronic address: rafael.simoes@gmail.com., Silva-Filho JC; Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil. Electronic address: caetano.flh@gmail.com., Cunha RM; Centro de Ciências Agrárias e Biológicas, Universidade do Vale do Acaraú, Rua Gerardo Rangel s/n, 62041-040, Sobral, Ceará, Brazil. Electronic address: rmaranguape@gmail.com., Cajazeiras JB; Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil. Electronic address: jcajazeiras@gmail.com., do Nascimento KS; Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil. Electronic address: kyriasantiago@gmail.com., Cavada BS; Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60455-970, Fortaleza, Ceará, Brazil. Electronic address: bscavada@gmail.com.
Jazyk: angličtina
Zdroj: Biochimie [Biochimie] 2016 Dec; Vol. 131, pp. 54-67. Date of Electronic Publication: 2016 Sep 21.
DOI: 10.1016/j.biochi.2016.09.010
Abstrakt: Legume lectins have been widely studied and applied for many purposes in the last few decades, but many of their physiological aspects remain elusive. The Diocleinae legume subtribe, which includes intensively explored lectins, such as ConA, presents an unusual and extensive post-translational process which results in minor alterations in protein structure, in turn making its function elusive. Despite previous reports about Diocleinae precursor activity, no structural or functional analyses have ever been carried out to understand the impacts of post-translational processing relative to lectin structure and binding specificity. Here we analyzed the functionality of a non glycosylated, recombinantly expressed lectin precursor from Dioclea grandiflora through inhibition assays, corroborating the experimental data with structural information generated by molecular modeling, docking calculations and molecular dynamics simulations. We demonstrate that Diocleinae precursors are active and share the same carbohydrate specificity as mature lectins. At the same time, however, subtle structural alterations were detected and mostly result in an "incomplete" functionality of the precursor, as consequence of an immature binding site and an unstructured tetramer interface, affecting carbohydrate binding and oligomer formation, respectively.
(Copyright © 2016 Elsevier B.V. and Société Française de Biochimie et Biologie Moléculaire (SFBBM). All rights reserved.)
Databáze: MEDLINE
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