7DL7

The wild-type structure of 3,5-DAHDHcca

Summary for 7DL7

• Entry DOI: 10.2210/pdb7dl7/pdb
• Descriptor: 3,5-diaminohexanoate dehydrogenase, DI(HYDROXYETHYL)ETHER, 1,2-ETHANEDIOL, ... (9 entities in total)
• Functional Keywords: oxidoreductase, dehydrogenase, 3s, 5s-dah
• Biological source: Cloacimonas acidaminovorans (strain Evry)
• Total number of polymer chains: 8
• Total formula weight: 316134.55

Authors

Liu, N.,Wu, L.,Zhu, D.M.,Zhou, J.H. (deposition date: 2020-11-26, release date: 2021-09-29, Last modification date: 2024-05-29)

Primary citation

Liu, N.,Wu, L.,Feng, J.,Sheng, X.,Li, J.,Chen, X.,Li, J.,Liu, W.,Zhou, J.,Wu, Q.,Zhu, D.
Crystal Structures and Catalytic Mechanism of l-erythro-3,5-Diaminohexanoate Dehydrogenase and Rational Engineering for Asymmetric Synthesis of beta-Amino Acids.
Angew.Chem.Int.Ed.Engl., 60:10203-10210, 2021

PubMed Abstract: Amino acid dehydrogenases (AADHs) have shown considerable potential as biocatalysts in the asymmetric synthesis of chiral amino acids. However, compared to the widely studied α-AADHs, limited knowledge is available about β-AADHs that enable the synthesis of β-amino acids. Herein, we report the crystal structures of a l-erythro-3,5-diaminohexanoate dehydrogenase and its variants, the only known member of β-AADH family. Crystal structure analysis, site-directed mutagenesis studies and quantum chemical calculations revealed the differences in the substrate binding and catalytic mechanism from α-AADHs. A number of rationally engineered variants were then obtained with improved activity (by 110-800 times) toward various aliphatic β-amino acids without an enantioselectivity trade-off. Two β-amino acids were prepared by using the outstanding variants with excellent enantioselectivity (>99 % ee) and high isolated yields (86-87 %). These results provide important insights into the molecular mechanism of 3,5-DAHDH, and establish a solid foundation for further design of β-AADHs for the asymmetric synthesis of β-amino acids.

PubMed: 33624917
DOI: 10.1002/anie.202017225

Experimental method

X-RAY DIFFRACTION (2.30065812844 Å)