| Title: | A novel glycoside hydrolase family 97 enzyme: Bifunctional β-l-arabinopyranosidase/α-galactosidase from Bacteroides thetaiotaomicron |
| Authors: | Kikuchi, Asako Browse this author |
| Okuyama, Masayuki Browse this author →KAKEN DB |
| Kato, Koji Browse this author |
| Osaki, Shohei Browse this author |
| Ma, Min Browse this author |
| Kumagai, Yuya Browse this author |
| Matsunaga, Kana Browse this author |
| Klahan, Patcharapa Browse this author |
| Tagami, Takayoshi Browse this author |
| Yao, Min Browse this author →KAKEN DB |
| Kimura, Atsuo Browse this author →KAKEN DB |
| Keywords: | Glycoside hydrolase family 97 |
| beta-L-Arabinopyranosidase/alpha-galactosidase |
| Bacteroides thetaiotaomicron |
| Crystal structure |
| Substrate recognition |
| Issue Date: | Nov-2017 |
| Publisher: | Elsevier |
| Journal Title: | Biochimie |
| Volume: | 142 |
| Start Page: | 41 |
| End Page: | 50 |
| Publisher DOI: | 10.1016/j.biochi.2017.08.003 |
| PMID: | 28804002 |
| Abstract: | Glycoside hydrolase family 97 (GH97) is one of the most interesting glycosidase families, which contains inverting and retaining glycosidases. Currently, only two enzyme types, alpha-glucoside hydrolase and alpha-galactosidase, are registered in the carbohydrate active enzyme database as GH97 function-known proteins. To explore new specificities, BT3661 and BT3664, which have distinct amino acid sequences when compared with that of GH97 alpha-glucoside hydrolase and alpha-galactosidase, were characterized in this study. BT3664 was identified to be an alpha-galactosidase, whereas BT3661 exhibits hydrolytic activity toward both beta-L-arabinopyranoside and alpha-D-galactopyranoside, and thus we designate BT3661 as a beta-L-arabinopyranosidase/alpha-D-galactosidase. Since this is the first dual substrate specificity enzyme in GH97, we investigated the substrate recognition mechanism of BT3661 by determining its three-dimensional structure and based on this structural data generated a number of mutants to probe the enzymatic mechanism. Structural comparison shows that the active-site pocket of BT3661 is similar to GH97 alpha-galactosidase BT1871, but the environment around the hydroxymethyl group of the galactopyranoside is different. While BT1871 bears G1u361 to stabilize the hydroxy group of C6 through a hydrogen bond with its carboxy group, BT3661 has Asn338 at the equivalent position. Amino acid mutation analysis indicates that the length of the side chain at Asn338 is important for defining specificity of BT3661. The kcat/Km value for the hydrolysis of p-nitrophenyl alpha-galactoside decreases when Asn338 is substituted with Glu, whereas an increase is observed when the mutation is Ala. Interestingly, mutation of Asn338 to Ala reduces the kcat/Km value for hydrolysis of p-nitrophenyl beta-L-arabinopyranoside. (C) 2017 Published by Elsevier B.V. |
| Rights: | © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/72070 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
