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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.)

Statistical coupling analysis of aspartic proteinases based on crystal structures of the Trichoderma reesei enzyme and its complex with pepstatin A

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Autor(es):
Nascimento, Alessandro S. [1] ; Krauchenco, Sandra [1] ; Golubev, Alexander M. [2] ; Gustchina, Alla [3] ; Wlodawer, Alexander [3] ; Polikarpov, Igor [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Grp Cristalog, Dept Fis & Informat, Inst Fis Sao Carlos, BR-13560970 Sao Paulo - Brazil
[2] Petersburg Nucl Phys Inst, St Petersburg 188300 - Russia
[3] NCI, Macromol Crystallog Lab, Frederick, MD 21702 - USA
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Molecular Biology; v. 382, n. 3, p. 763-778, Oct. 2008.
Área do conhecimento: Ciências Biológicas - Biofísica
Citações Web of Science: 7
Assunto(s):Biofísica   Cristalografia física   Enzimas   Fungos   Trichoderma   Ácido aspártico proteases
Resumo

The crystal structures of an aspartic proteinase from Trichoderma reesei (TrAsP) and of its complex with a competitive inhibitor, pepstatin A, were solved and refined to crystallographic R-factors of 17.9% (Rfree=21.2%) at 1.70 A resolution and 15.8% (Rfree=19.2%) at 1.85 A resolution, respectively. The three-dimensional structure of TrAsP is similar to structures of other members of the pepsin-like family of aspartic proteinases. Each molecule is folded in a predominantly BETA-sheet bilobal structure with the N-terminal and C-terminal domains of about the same size. Structural comparison of the native structure and the TrAsP-pepstatin complex reveals that the enzyme undergoes an induced-fit, rigid-body movement upon inhibitor binding, with the N-terminal and C-terminal lobes tightly enclosing the inhibitor. Upon recognition and binding of pepstatin A, amino acid residues of the enzyme active site form a number of short hydrogen bonds to the inhibitor that may play an important role in the mechanism of catalysis and inhibition. The structures of TrAsP were used as a template for performing statistical coupling analysis of the aspartic protease family. This approach permitted, for the first time, the identification of a network of structurally linked residues putatively mediating conformational changes relevant to the function of this family of enzymes. Statistical coupling analysis reveals coevolved continuous clusters of amino acid residues that extend from the active site into the hydrophobic cores of each of the two domains and include amino acid residues from the flap regions, highlighting the importance of these parts of the protein for its enzymatic activity. (AU)

Processo FAPESP: 04/08070-9 - Estudos estruturais do receptor de mineralocorticóide humano
Beneficiário:Alessandro Silva Nascimento
Linha de fomento: Bolsas no Brasil - Doutorado Direto
Processo FAPESP: 99/03387-4 - Estudos estruturais de proteínas usando luz síncrotron
Beneficiário:Igor Polikarpov
Linha de fomento: Auxílio à Pesquisa - Temático