Modeling and structural analysis of cellulases using Clostridium thermocellum as template

Area of Science:

• Biochemistry and enzymology
• Molecular biology
• Bioinformatics

Background:

• Cellulases are crucial enzymes for biomass conversion into sugars.
• Understanding cellulase properties is vital for industrial applications.
• Comparative analysis of cellulases from diverse microbial sources is needed.

Purpose of the Study:

• To compare cellulase from Trichoderma longibrachiatum with other microbial cellulases.
• To analyze physicochemical properties and structural features of various cellulases.
• To identify optimal cellulase models for potential applications.

Main Methods:

• BLASTp for sequence similarity searches against the NCBI protein database.
• ExPASy's ProtParam tool for physicochemical property analysis.
• Homology modeling using SWISS MODEL and quality assessment with VMD.
• Active site prediction using SCFBio server.
• Phylogenetic analysis using Neighbor-joining tree.

Main Results:

• Trichoderma longibrachiatum and Melanocarpus albomyces cellulases showed instability.
• Negative GRAVY scores indicated favorable aqueous phase activity.
• Molecular weight ranged from 25-127.56 kDa; isoelectric points were acidic.
• Secondary structure analysis revealed a dominance of random coils.
• Pseudoalteromonas haloplanktis cellulase yielded the ideal homology model (lowest RMSD).
• Trichoderma longibrachiatum cellulase exhibited the most active sites (ASN, THR, CYS rich) and high hydrophilic residues.

Conclusions:

• Trichoderma longibrachiatum cellulase is a promising candidate due to its favorable active site characteristics and stability.
• Comparative bioinformatics analysis provides insights into cellulase structure-function relationships.
• This study aids in selecting and engineering cellulases for efficient biomass conversion.