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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.)

Dissecting structure-function-stability relationships of a thermostable GH5-CBM3 cellulase from Bacillus subtilis 168

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Santos, Camila R. [1] ; Paiva, Joice H. [1] ; Sforca, Mauricio L. [1] ; Neves, Jorge L. [1] ; Navarro, Rodrigo Z. [1] ; Cota, Junio [2] ; Akao, Patricia K. [1] ; Hoffmam, Zaira B. [2] ; Meza, Andreia N. [1] ; Smetana, Juliana H. [1] ; Nogueira, Maria L. [1] ; Polikarpov, Igor [3] ; Xavier-Neto, Jose [1] ; Squina, Fabio M. [2] ; Ward, Richard J. [4] ; Ruller, Roberto [2] ; Zeri, Ana C. [1] ; Murakami, Mario T. [1]
Total Authors: 18
[1] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Biociencias, Campinas, SP - Brazil
[2] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Ciencia & Tecnol Bioetanol, Campinas, SP - Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil
[4] Univ Sao Paulo, Dept Quim, BR-14049 Ribeirao Preto - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Biochemical Journal; v. 441, n. 1, p. 95-104, JAN 1 2012.
Web of Science Citations: 49

Cellulases participate in a number of biological events, such as plant cell wall remodelling, nematode parasitism and microbial carbon uptake. Their ability to depolymerize crystalline cellulose is of great biotechnological interest for environmentally compatible production of fuels from lignocellulosic biomass. However, industrial use of cellulases is somewhat limited by both their low catalytic efficiency and stability. In the present study, we conducted a detailed functional and structural characterization of the thermostable BsCe15A (Bacillus subtilis cellulase 5A), which consists of a GH5 (glycoside hydrolase 5) catalytic domain fused to a CBM3 (family 3 carbohydrate-binding module). NMR structural analysis revealed that the Bacillus CBM3 represents a new subfamily, which lacks the classical calcium-binding motif, and variations in NMR frequencies in the presence of cellopentaose showed the importance of polar residues in the carbohydrate interaction. Together with the catalytic domain, the CBM3 forms a large planar surface for cellulose recognition, which conducts the substrate in a proper conformation to the active site and increases enzymatic efficiency. Notably, the manganese ion was demonstrated to have a hyper-stabilizing effect on BsCel5A, and by using deletion constructs and X-ray crystallography we determined that this effect maps to a negatively charged motif located at the opposite face of the catalytic site. (AU)

FAPESP's process: 10/51890-8 - SMOLBnet 2.0: Structural studies of transcription factors involved in the regulation of hydrolytic enzyme genes and swollenin from Aspergillus niger and A. fumigatus
Grantee:Mário Tyago Murakami
Support type: Regular Research Grants