# Cellulases: key properties, natural sources, and industrial applications

## TL;DR

This paper reviews cellulases, enzymes that break down cellulose, focusing on their properties, sources, and industrial uses.

## Contribution

The paper provides a comprehensive overview of cellulases, emphasizing extremophilic variants and their industrial relevance.

## Key findings

- Cellulases are crucial for breaking down cellulose in various industries.
- Extremophilic cellulases are highlighted for their suitability in modern industrial processes.
- The paper discusses methods for producing and modifying cellulases for practical applications.

## Abstract

This review focuses on cellulases, a subclass of hydrolases that catalyse the breakdown of the polysaccharide cellulose. Cellulases are of immense practical significance, given that cellulose-containing materials are utilised across a multitude of industrial sectors. An overview of the fundamental properties and structure of cellulases is provided. However, primary attention is paid to the industrial application of these enzymes, with other aspects discussed within this context. The most practically significant bacterial and fungal cellulases are analysed, with their key benefits and differences being emphasised. Particular attention is paid to extremophilic (specifically thermo-, psychro-, and halophilic) cellulases, as they possess properties essential for modern technological processes. Given that practical application necessitates mass production and an optimal combination of enzymatic characteristics, the creation of effective producers and the modification of cellulase properties are also assessed. Finally, key trends in cellulase production approaches and their future application potential are summarised.