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Updated: Jun 25, 2026

A High Throughput Screen for Biomining Cellulase Activity from Metagenomic Libraries

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Published on: February 2, 2011

Efficient production of cellulolytic and xylanolytic enzymes by the rumen anaerobic fungus, Neocallimastix frontalis,

K Srinivasan¹, M Murakami, Y Nakashimada

¹Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan.

Journal of Bioscience and Bioengineering

|October 20, 2005

Summary

This summary is machine-generated.

Fermentation products like acetate inhibit Neocallimastix frontalis growth. Repeated batch cultures minimized inhibition, leading to continuous cellulolytic and xylanolytic enzyme production.

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Published on: October 24, 2016

Area of Science:

Fungal biotechnology
Enzyme kinetics
Industrial microbiology

Background:

Neocallimastix frontalis is a key anaerobic fungus for lignocellulose degradation.
High cellulose concentrations can lead to inhibitory fermentation product accumulation.
Understanding these inhibitory effects is crucial for optimizing enzyme production.

Purpose of the Study:

To investigate the inhibitory effects of fermentation products on Neocallimastix frontalis growth.
To determine the kinetic model for product inhibition.
To optimize enzyme production through repeated batch culturing.

Main Methods:

Batch cultures with varying cellulose concentrations (4 g/L and 8 g/L).
Kinetic studies to model the impact of acetate, formate, lactate, and ethanol on growth rate.
Repeated batch culture strategy to maintain low fatty acid concentrations.

Main Results:

Fermentation product and enzyme concentrations did not increase with higher cellulose levels in batch culture.
Acetate was identified as the strongest inhibitor at low concentrations.
Repeated batch culture prevented fatty acid accumulation and enabled continuous enzyme production.

Conclusions:

Noncompetitive inhibition by fermentation products limits Neocallimastix frontalis growth.
Repeated batch culturing is an effective strategy to overcome product inhibition.
Sustained production of cellulolytic and xylanolytic enzymes was achieved over 20 days.