Biochemical characterization, molecular cloning, and structural modeling of an interesting β-1,4-glucanase from Sclerotinia sclerotiorum.

Abstract:

:The filamentous fungus Sclerotinia sclerotiorum produces a complete set of cellulolytic enzymes needed for efficient solubilization of native cellulose, the major component of plants. In this work, we reported the molecular characterization of an important glycosyl-hydrolase enzyme classified as endo-β-1,4-glucanase. The importance of this enzyme was revealed with the in-gel activity staining, showing a high degradation capacity of cellulose. When purified from native gel and ran in denaturing polyacrylamide gel, the polypeptide has an apparent molecular mass of about 34 kDa called Endo2. For further characterization of this protein, a mass spectrometry approach was carried out. The LC-MS/MS analysis revealed two peptides belonging to this enzyme. The genomic DNA and cDNA sequences were resolved by PCR amplification and sequencing, revealing a gene with two intron sequences. The open reading frame of 987 bp encoded a putative polypeptide of 328 amino acids having a calculated molecular mass of 33,297 Da. Yet, the molecular modeling and comparative investigation of different 3D cellulase structures showed that this endoglucanase isoform has probably two domains. A core domain having a high similarity with endoglucanases family 5 and a cellulose-binding domain having similarities with those of exo-type cellulases of family 1, linked together by a serine-threonine-rich region. These results are with great interests and show new characteristics of S. sclerotiorum glucanase.

journal_name

Mol Biotechnol

journal_title

Molecular biotechnology

authors

Chahed H,Ezzine A,Mlouka AB,Hardouin J,Jouenne T,Marzouki MN

doi

10.1007/s12033-013-9714-0

subject

Has Abstract

pub_date

2014-04-01 00:00:00

pages

340-50

issue

4

eissn

1073-6085

issn

1559-0305

journal_volume

56

pub_type

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