What this means
This review looks at why some plant-breaking enzymes survive heat better than others. It also compares ways scientists make these enzymes tougher. It does not test new enzymes itself, so it cannot prove any one method works best.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- A review of earlier studies on heat-tolerant enzymes; no new experiments reported
- Kind of research
- A summary of earlier studies
The science
- Original title
- Thermostable Carbohydrate-Active Enzymes for High-Temperature Biomass Conversion: From Molecular Design to Process Integration.
- Authors
- Hu Y, Yang X, Wang T et al.
- Journal
- International journal of molecular sciences
- Published
- Oct 16, 2026
- Study type
- Review
- PMID
- 42884031 ↗
Abstract
High-temperature processing of carbohydrate-rich biomass, including starch liquefaction and lignocellulose saccharification, can improve sugar yields, reduce contamination risks, and facilitate integration with thermochemical pretreatments. However, the operational stability of native carbohydrate-active enzymes (CAZymes) at 60-90 °C remains a major bottleneck for efficient and economically viable biorefineries, and existing reviews rarely integrate multiscale molecular mechanisms with process-relevant engineering strategies. This review systematically examines the multiscale basis of thermostability in CAZymes-covering core hydrophobic packing, electrostatic and metal-mediated networks, disulfide bonds, conformational dynamics, and modular architectures involving catalytic domains, linkers, and carbohydrate-binding modules-and directly links these features to enzyme longevity under high-solids, inhibitor-rich conditions. We then critically compare key engineering strategies, including structure-guided rational design, semi-rational directed evolution, consensus design, ancestral sequence reconstruction, and machine learning-assisted workflows embedded in design-build-test-learn (DBTL) cycles, highlighting their respective strengths, limitations, and complementarity. Representative case studies demonstrate that engineered thermophilic α-amylases and cellulases achieving ΔTm improvements of approximately 10-20 °C can sustain >80-85% residual activity after prolonged exposure at process-relevant temperatures, translating into tangible benefits such as 15-30% reductions in enzyme dosing and measurable decreases in steam consumption, alongside higher sugar titers. By bridging molecular determinants, engineering paradigms, and quantitative process performance, this review provides a pragmatic roadmap for deploying thermostable CAZymes as robust biocatalysts in sustainable high-temperature biomass conversion.
Hu Y, Yang X, Wang T et al. Thermostable Carbohydrate-Active Enzymes for High-Temperature Biomass Conversion: From Molecular Design to Process Integration. International journal of molecular sciences. 2026. doi:10.3390/ijms27198788. PMID: 42884031. https://pubmed.ncbi.nlm.nih.gov/42884031/