{"title":"Expression of Recombinant Human α-Glucosidase in HEK293 Cells","authors":"So Nishimoto, Anaïs Debarbat, Yuki Ikeda, Emi Arikawa, Yuki Odagaki, Haruna Yano, Ying Qiao, Masaaki Ito, Toshiyuki Kimura, Teisuke Takita, Kiyoshi Yasukawa","doi":"10.1021/acs.jafc.4c06902","DOIUrl":null,"url":null,"abstract":"In mammals, intestinal α-glucosidase exists as a maltase–glucoamylase complex (MGAM) and a sucrase–isomaltase complex (SI). In this study, we transiently expressed human MGAM and SI in human embryonic kidney 293 (HEK293) cells. At pH 6.0 and 37 °C, the MGAM-expressing HEK293 cells extract (MGE) exhibited maltase, glucoamylase, and isomaltase activities but not sucrase activity, whereas the SI-expressing HEK293 cells extract (SIE) exhibited sucrase, isomaltase, and maltase activities but not glucoamylase activity. The apparent <i>K</i><sub>m</sub> value of the MGE for maltose hydrolysis was 14–26% of that of the SIE for maltose, sucrose, and isomaltose hydrolysis. The respective apparent <i>V</i><sub>max</sub> values of the MGE and SIE for sucrose and isomaltose hydrolysis were 0% and 6% and 10% and 42% of those for maltose hydrolysis. These results indicated that the maltase activities of MGAM and SI were higher than those of sucrase and isomaltase.","PeriodicalId":41,"journal":{"name":"Journal of Agricultural and Food Chemistry","volume":"83 1","pages":""},"PeriodicalIF":5.7000,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Agricultural and Food Chemistry","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1021/acs.jafc.4c06902","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In mammals, intestinal α-glucosidase exists as a maltase–glucoamylase complex (MGAM) and a sucrase–isomaltase complex (SI). In this study, we transiently expressed human MGAM and SI in human embryonic kidney 293 (HEK293) cells. At pH 6.0 and 37 °C, the MGAM-expressing HEK293 cells extract (MGE) exhibited maltase, glucoamylase, and isomaltase activities but not sucrase activity, whereas the SI-expressing HEK293 cells extract (SIE) exhibited sucrase, isomaltase, and maltase activities but not glucoamylase activity. The apparent Km value of the MGE for maltose hydrolysis was 14–26% of that of the SIE for maltose, sucrose, and isomaltose hydrolysis. The respective apparent Vmax values of the MGE and SIE for sucrose and isomaltose hydrolysis were 0% and 6% and 10% and 42% of those for maltose hydrolysis. These results indicated that the maltase activities of MGAM and SI were higher than those of sucrase and isomaltase.
期刊介绍:
The Journal of Agricultural and Food Chemistry publishes high-quality, cutting edge original research representing complete studies and research advances dealing with the chemistry and biochemistry of agriculture and food. The Journal also encourages papers with chemistry and/or biochemistry as a major component combined with biological/sensory/nutritional/toxicological evaluation related to agriculture and/or food.