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Abstract
5-propyl-2-((trityloxy)methyl)thiophene-3-carbaldehyde was synthesized by using the concept of chemo- and regioselective Br/Li exchange reaction from 3-bromo-5-propyl-2-((trityloxy)methyl)thiophene. This is a five-step protocol starting from thiophene with an overall yield of 33%. These lithium/halogen exchange reactions were carried out at −78 °C to rt over the period of 1 to 18 h depending on the reactivity of electrophiles.
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Rachadech W, Kato Y, Abou El-Magd RM, Shishido Y, Kim SH, Sogabe H, Maita N, Yorita K, Fukui K. P219L substitution in human D-amino acid oxidase impacts the ligand binding and catalytic efficiency. J Biochem 2021; 168:557-567. [PMID: 32730563 DOI: 10.1093/jb/mvaa083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 06/23/2020] [Indexed: 11/13/2022] Open
Abstract
Human D-amino acid oxidase (DAO) is a flavoenzyme that is implicated in neurodegenerative diseases. We investigated the impact of replacement of proline with leucine at Position 219 (P219L) in the active site lid of human DAO on the structural and enzymatic properties, because porcine DAO contains leucine at the corresponding position. The turnover numbers (kcat) of P219L were unchanged, but its Km values decreased compared with wild-type, leading to an increase in the catalytic efficiency (kcat/Km). Moreover, benzoate inhibits P219L with lower Ki value (0.7-0.9 µM) compared with wild-type (1.2-2.0 µM). Crystal structure of P219L in complex with flavin adenine dinucleotide (FAD) and benzoate at 2.25 Å resolution displayed conformational changes of the active site and lid. The distances between the H-bond-forming atoms of arginine 283 and benzoate and the relative position between the aromatic rings of tyrosine 224 and benzoate were changed in the P219L complex. Taken together, the P219L substitution leads to an increase in the catalytic efficiency and binding affinity for substrates/inhibitors due to these structural changes. Furthermore, an acetic acid was located near the adenine ring of FAD in the P219L complex. This study provides new insights into the structure-function relationship of human DAO.
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Affiliation(s)
- Wanitcha Rachadech
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan.,Division of Chemistry, Faculty of Science, Udon Thani Rajabhat University, 64 Thahan Road, Muang, Udon Thani 41000, Thailand
| | - Yusuke Kato
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Rabab M Abou El-Magd
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Yuji Shishido
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Soo Hyeon Kim
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Hirofumi Sogabe
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Nobuo Maita
- Division of Disease Proteomics, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Kazuko Yorita
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Kiyoshi Fukui
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
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Kato Y, Takahashi K, Ito F, Suzuki S, Fukui K, Mimaki M, Suzuki K. Novel oseltamivir-resistant mutations distant from the active site of influenza B neuraminidase. J Biomol Struct Dyn 2020; 39:3491-3500. [PMID: 32406800 DOI: 10.1080/07391102.2020.1765872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We performed a neuraminidase sequence analysis of thirty-two pediatric patients with influenza B who visited Teikyo University Hospital from January 2016 to March 2017, and found oseltamivir-resistant samples belonging to the Yamagata and Victoria lineages. Comparison with the neuraminidase sequence of oseltamivir-susceptible B/Brisbane/60/2008 revealed 5 common amino acid substitutions in many of these samples. According to the binding free energy calculation, the N340D and E358K substitutions reduced the affinity of oseltamivir to neuraminidase. Unexpectedly, these substitutions were located distant from the oseltamivir-binding site in neuraminidase. According to the molecular dynamics simulations, the N340D substitution rearranged complicated hydrogen bond networks in an extensive surface region of neuraminidase. The E358K substitution extensively altered the electrostatic potential map of the overall neuraminidase structure. Through these novel mechanisms, the N340D and E358K substitutions indirectly influenced the affinity reduction. These results may be useful for designing drugs for the treatment of oseltamivir-resistant virus infections.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Yusuke Kato
- Institute for Enzyme Research, Tokushima University, Tokushima, Japan.,Asia International Institute of Infectious Disease Control, Teikyo University, Tokyo, Japan
| | - Kazuhiro Takahashi
- Asia International Institute of Infectious Disease Control, Teikyo University, Tokyo, Japan.,Department of Pediatrics, Teikyo University School of Medicine, Tokyo, Japan
| | - Fuyu Ito
- Asia International Institute of Infectious Disease Control, Teikyo University, Tokyo, Japan
| | - Shoichi Suzuki
- Asia International Institute of Infectious Disease Control, Teikyo University, Tokyo, Japan
| | - Kiyoshi Fukui
- Institute for Enzyme Research, Tokushima University, Tokushima, Japan
| | - Masakazu Mimaki
- Department of Pediatrics, Teikyo University School of Medicine, Tokyo, Japan
| | - Kazuo Suzuki
- Asia International Institute of Infectious Disease Control, Teikyo University, Tokyo, Japan
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Palmieri A. Synthesis of Heterocyclic Systems Starting from Carbonyl and Carboxyl Functionalized Nitro Compounds by One-Pot Processes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Alessandro Palmieri
- Green Chemistry Group; School of Science and Technology; Chemistry Division; University of Camerino; Via S. Agostino n. 1 62032 Camerino Italy
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Chiurchiù E, Patehebieke Y, Gabrielli S, Ballini R, Palmieri A. β‐Nitroacrylates as Starting Materials of Thiophene‐2‐Carboxylates Under Continuous Flow Conditions. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801660] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Elena Chiurchiù
- Green Chemistry Group, Chemistry Division, School of Science and TechnologyUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
| | - Yeersen Patehebieke
- Green Chemistry Group, Chemistry Division, School of Science and TechnologyUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
| | - Serena Gabrielli
- Green Chemistry Group, Chemistry Division, School of Science and TechnologyUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
| | - Roberto Ballini
- Green Chemistry Group, Chemistry Division, School of Science and TechnologyUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
| | - Alessandro Palmieri
- Green Chemistry Group, Chemistry Division, School of Science and TechnologyUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
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