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Role of the half-barrels subdomains on the stability of beta-glucosidases

Grant number: 14/16913-8
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2015
Effective date (End): November 30, 2018
Field of knowledge:Biological Sciences - Biochemistry - Enzymology
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Sandro Roberto Marana
Grantee:Maira Artischeff Frutuoso
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Protein domains are segments with stable and independent folding (Richardson, 1981; Dootlitle, 1995; Porter e Rose, 2012). Based on this definition, the structure of the (beta/alpha)8 barrels proteins was shown to be composed by two domains corresponding to its N- and C-terminal halves. In agreement, the analysis of the contact map of the beta-glucosidases GH1, also (beta/alpha)8 barrels, indicated the presence of two domains formed by sets of residues which mostly form intra-group interactions (Smith et al., 2013). These two domains are the N- and C-terminal halves of the beta-glucosidases GH1. Therefore, both approaches indicated that (beta/alpha)8 barrels proteins are formed by two domains corresponding to the N- and C-terminal halves. The objective of this project is to understand how the specific properties of the half-barrel domains are combined resulting in the properties of the (beta/alpha)8 barrels. The thermostable beta-glucosidase from Thermatoga maritima (Tmbglu), two beta-glucosidases from Paenebacillus polymyxa (bglA e bglB) and chimeric proteins formed by the combination of the N- e C-terminal halves of these enzymes (NTmbglu-CbglB, NbglB-CTmbglu, NbglA-CbglB e NbglB-CbglA) will be evaluated about their thermostability and stability in urea. Considering that the half-barrel domains should be thermodynamically stable units, it should be possible to detected their contributions to the chimera beta-glucosidases stability evaluating the changes in the rate constant for thermal denaturation and the transition temperature. In addition to that, the specific stability of each half-barrel domain in urea, evaluated by the "m" parameter, could be compared to the stability of the native and chimera beta-glucosidases, revealing how the specific stability of each domain combines to result in the stability of the entire (beta/alpha)8 barrel. (AU)

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
FRUTUOSO, Maira Artischeff. Contribution of (β/α)4 subdomains to the stability and activity of β-glycosidases GH1 with (β/α)8 barrel structure. 2019. Doctoral Thesis - Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) São Paulo.

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