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Updated: Aug 10, 2026

Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach
Published on: June 23, 2026
A new approach to possible substrate binding mechanisms for nitrile hydratase
A Ozlem Taştan Bishop1, Trevor Sewell
1Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa. ozlem@tuks.co.za
Normal mode analysis combined with cavity calculations reveals dynamic mechanisms in nitrile hydratase (NHase) enzyme structures. This study proposes "breathing" and "flip-flop" motions crucial for substrate binding in NHase.
Area of Science:
- Biophysics
- Structural Biology
- Enzymology
Background:
- Nitrile hydratase (NHase) enzymes are crucial biocatalysts.
- Understanding NHase substrate binding mechanisms is key for enzyme engineering.
- Static crystal structures offer limited insight into enzyme dynamics.
Purpose of the Study:
- To investigate dynamic aspects of static crystal structures using computational methods.
- To explore the role of N-terminal regions in substrate selection for Co-type NHase.
- To propose novel mechanisms for substrate binding in NHase.
Main Methods:
- Combined normal mode analysis (NMA) with cavity calculations.
- Utilized crystal structure of Pseudonocardia thermophila NHase (1UGP) as a reference.
- Compared reference structure with other available NHase crystal structures.
Main Results:
- Cavity calculations identified active site entrances and suggested N-terminal roles in substrate selection.
- Integration of NMA and cavity calculations revealed a closing-opening passage.
- Analysis of low-frequency modes indicated potential "breathing" and "flip-flop" mechanisms.
Conclusions:
- The study proposes "breathing" and "flip-flop" mechanisms as integral to NHase substrate binding.
- Computational insights into NHase dynamics can guide future enzyme design.
- N-terminal regions may play a significant role in substrate specificity for Co-type NHase.
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