3ERP

Structure of IDP01002, a putative oxidoreductase from and essential gene of Salmonella typhimurium

3ERP の概要

• エントリーDOI: 10.2210/pdb3erp/pdb
• 分子名称: Putative oxidoreductase, ZINC ION, SODIUM ION, ... (7 entities in total)
• 機能のキーワード: funded by the national institute of allergy and infectious diseases of nih contract number hhsn272200700058c, predicted oxidoreductase, essential gene, salmonella, molecular replacement, structural genomics, center for structural genomics of infectious diseases, csgid, oxidoreductase
• 由来する生物種: Salmonella enterica subsp. enterica serovar Typhimurium
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 81159.17

構造登録者

Singer, A.U.,Minasov, G.,Evdokimova, E.,Brunzelle, J.S.,Kudritska, M.,Edwards, A.M.,Anderson, W.F.,Savchenko, A.,Center for Structural Genomics of Infectious Diseases (CSGID) (登録日: 2008-10-02, 公開日: 2008-11-04, 最終更新日: 2023-09-06)

主引用文献

Kim, T.,Flick, R.,Brunzelle, J.,Singer, A.,Evdokimova, E.,Brown, G.,Joo, J.C.,Minasov, G.A.,Anderson, W.F.,Mahadevan, R.,Savchenko, A.,Yakunin, A.F.
Structural and biochemical studies of novel aldo-keto reductases for the biocatalytic conversion of 3-hydroxybutanal to 1,3-butanediol.
Appl.Environ.Microbiol., 2017

PubMed Abstract: The nonnatural alcohol 1,3-butanediol (1,3-BDO) is a valuable building block for the synthesis of various polymers. One of the potential pathways for the biosynthesis of 1,3-BDO includes the biotransformation of acetaldehyde to 1,3-BDO via 3-hydroxybutanal (3-HB) using aldolases and aldo-keto reductases (AKRs). This pathway requires an AKR selective for 3-HB, but inactive toward acetaldehyde, so it can be used for one-pot synthesis. In this work, we screened more than 20 purified uncharacterized AKRs for 3-HB reduction and identified 10 enzymes with significant activity and nine proteins with detectable activity. PA1127 from showed the highest activity and was selected for comparative studies with STM2406 from serovar Typhimurium, for which we have determined the crystal structure. Both AKRs used NADPH as a cofactor, reduced a broad range of aldehydes, and showed low activities toward acetaldehyde. The crystal structures of STM2406 in complex with cacodylate or NADPH revealed the active site with bound molecules of a substrate mimic or cofactor. Site-directed mutagenesis of STM2406 and PA1127 identified the key residues important for the activity against 3-HB and aromatic aldehydes, which include the residues of the substrate-binding pocket and C-terminal loop. Our results revealed that the replacement of the STM2406 Asn65 by Met enhanced the activity and the affinity of this protein toward 3-HB, resulting in a 7-fold increase in / Our work provides further insights into the molecular mechanisms of the substrate selectivity of AKRs and for the rational design of these enzymes toward new substrates. In this study, we identified several aldo-keto reductases with significant activity in reducing 3-hydroxybutanal to 1,3-butanediol (1,3-BDO), an important commodity chemical. Biochemical and structural studies of these enzymes revealed the key catalytic and substrate-binding residues, including the two structural determinants necessary for high activity in the biosynthesis of 1,3-BDO. This work expands our understanding of the molecular mechanisms of the substrate selectivity of aldo-keto reductases and demonstrates the potential for protein engineering of these enzymes for applications in the biocatalytic production of 1,3-BDO and other valuable chemicals.

PubMed: 28130301
DOI: 10.1128/AEM.03172-16

実験手法

X-RAY DIFFRACTION (1.55 Å)