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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Molecular mechanism of activation of Burkholderia cepacia lipase at aqueous-organic interfaces

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de Oliveira, Ivan Pires ; Jara, Gabriel Ernesto ; Martinez, Leandro [1]
Total Authors: 3
[1] Univ Estadual Campinas, Inst Chem, Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 19, n. 46, p. 31499-31507, DEC 14 2017.
Web of Science Citations: 2

Lipases are water-soluble enzymes that catalyze the hydrolysis of lipids. Since lipids are mostly hydrophobic, lipase activity occurs preferentially at interfaces of aqueous and organic phases. In this work, we study the molecular mechanisms by which the Burkholderia cepacia lipase (BCL) is activated at interfaces of water with octane and with methyl caprylate (CAME). We show that BCL assumes very rapidly a preferential orientation at the interfaces, in which the active site is exposed to the organic phase. With BCL oriented to the interface, we compute the free energy of the aperture of the catalytic pocket using Adaptive Biasing Force MD simulations. The exposure to the organic phase promotes a clear stabilization of the open form of the catalytic pocket relative to the enzyme in water. This stabilization stems from the hydrophobicity of domains U1 and U2, which allows the penetration of organic solvents into the catalytic cleft impeding the closure of the pocket. Our results suggest that the structure and hydrophobicity of BCL are optimized for its activation in biphasic systems through the regulation of the accessibility of the catalytic pocket by, and for, hydrophobic substrates. The understanding of this mechanism may be useful for the design of proteins with targeted activation. (AU)

FAPESP's process: 13/22360-9 - Computational Study of the mechanism of conversion of ATP to cyclic-AMP catalyzed by the Edema Factor of Anthrax
Grantee:Gabriel Ernesto Jara
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 10/16947-9 - Correlations between dynamics, structure and function in protein: computer simulations and algorithms
Grantee:Leandro Martinez
Support type: Regular Research Grants
FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
Grantee:Munir Salomao Skaf
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 13/05475-7 - Computational methods in optimization
Grantee:Sandra Augusta Santos
Support type: Research Projects - Thematic Grants