9IPR image
Entry Detail
PDB ID:
9IPR
Title:
Crystal structure of CTB10-M1
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2024-07-11
Release Date:
2025-05-14
Method Details:
Experimental Method:
Resolution:
1.94 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CTB10
Mutations:W13F
Chain IDs:A, B, C, D, E, F, G, H
Chain Length:141
Number of Molecules:8
Biological Source:Cercospora sp. JNU001
Primary Citation
Light-Driven Deracemization by a Designed Photoenzyme.
J.Am.Chem.Soc. 147 13190 13199 (2025)
PMID: 40219972 DOI: 10.1021/jacs.4c16521

Abstact

The creation of enzymes with abiological abilities offers exciting opportunities to access new-to-nature biocatalysis beyond that found in nature. Here, we repurpose a novel protein scaffold, CTB10, as an artificial photoenzyme through genetic code expansion. It enables catalytic deracemization of cyclopropane, a process that remains inaccessible to traditional biocatalysis due to its thermodynamically unfavorable nature. Following structural optimization through directed evolution, a broad substrate scope with high enantioselectivities is achieved. Furthermore, the crystal structure of the CTB10-based photoenzyme-substrate complex well demonstrates how the catalytic chiral cavity is sculpted to promote efficient and selective light-enabled deracemization. Therefore, this study unlocks the potential for achieving challenging deracemization through biocatalysis.

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