In silico Structural, Functional and Phylogenetic Analyses of cellulase from Ruminococcus albus

The digestion of plant cell walls in ruminants relies on microbial enzymes like cellulase. While the role of cellulose-degrading bacteria is well known, specific structural and functional details of cellulase from Ruminococcus albus remain unclear. Prior research has shown that Ruminococcus species contribute significantly to cellulose breakdown in the rumen. However, no prior work had resolved the in silico structure and function of R. albus cellulase. This gap motivated the use of bioinformatics to explore the enzyme’s properties. Computational tools allow for detailed analysis of protein structure and stability. The study builds on established methods in protein modeling and phylogenetic analysis. No prior work had applied these techniques to R. albus cellulase. This uncertainty drove the investigation into the enzyme’s characteristics.

The goal was to characterize Ruminococcus albus cellulase using in silico methods. Researchers aimed to explore the enzyme’s physicochemical properties and structural features. They focused on primary, secondary, and tertiary structure predictions. The study sought to compare cellulase sequences from six R. albus strains. The authors wanted to estimate stability and thermostability of the enzyme. They also aimed to build a 3D model of the protein. The purpose included constructing a phylogenetic tree of the enzyme variants. This approach allows for insights into function and evolution of the enzyme.

The researchers retrieved protein sequences from UniProt for six R. albus strains. They used ProtParam and Protscale to analyze amino acid composition and physicochemical properties. Multiple sequence alignment was performed with Clustal Omega. A phylogenetic tree was built using Mega X software. The team applied Raptor X to predict the tertiary structure of cellulase. ModRefiner was used to refine the predicted 3D model. Structure alignment compared the model to the homologous template 6Q1I_A. Ramachandran plot analysis evaluated the model’s structural validity.

The instability index suggested high stability of the cellulase proteins. The enzyme is dominated by random coils and alpha helices in secondary structure. Aliphatic index values above 71 indicated high thermostability. No transmembrane domains were detected in the protein sequences. The enzyme was predicted to be extracellular and moderately acidic. Raptor X generated the best tertiary structure model, refined by ModRefiner. The Ramachandran plot showed 90.1% of residues in favored regions. The study demonstrated structural similarity between the model and the template 6Q1I_A.

The authors concluded that the cellulase from R. albus has notable structural and functional properties. Their findings suggest the enzyme is stable and thermostable based on aliphatic index and instability index. The absence of transmembrane domains implies an extracellular function. The predicted tertiary structure aligns well with the template 6Q1I_A. The Ramachandran plot analysis confirmed structural accuracy of the model. The study provides insights into the enzyme’s structure and function for the first time. These results may help in future in vivo or in silico detection of the enzyme. The findings support further bioinformatics-based investigations into cellulase function.