Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703
Abstract The food enzyme α‐cyclodextrin glucanotransferase ((1→4)‐α‐d‐glucan 4‐α‐d‐[(1→4)‐α‐d‐glucano]‐transferase; EC 2.4.1.19) is produced with a genetically modified Escherichia coli strain WCM105xpCM703 by Wacker Chemie GmbH. The production strain harbours a self‐replicating multicopy plasmid wh...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-10-01
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| Series: | EFSA Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.2903/j.efsa.2020.6248 |
| _version_ | 1818948110703919104 |
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| author | EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP) Vittorio Silano José Manuel Barat Baviera Claudia Bolognesi Pier Sandro Cocconcelli Riccardo Crebelli David Michael Gott Konrad Grob Claude Lambré Evgenia Lampi Marcel Mengelers Alicja Mortensen Gilles Rivière Inger‐Lise Steffensen Christina Tlustos Henk Van Loveren Laurence Vernis Holger Zorn Jaime Aguilera Natalia Kovalkovicova Yi Liu Joaquim Maia Andrew Chesson |
| author_facet | EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP) Vittorio Silano José Manuel Barat Baviera Claudia Bolognesi Pier Sandro Cocconcelli Riccardo Crebelli David Michael Gott Konrad Grob Claude Lambré Evgenia Lampi Marcel Mengelers Alicja Mortensen Gilles Rivière Inger‐Lise Steffensen Christina Tlustos Henk Van Loveren Laurence Vernis Holger Zorn Jaime Aguilera Natalia Kovalkovicova Yi Liu Joaquim Maia Andrew Chesson |
| author_sort | EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP) |
| collection | DOAJ |
| description | Abstract The food enzyme α‐cyclodextrin glucanotransferase ((1→4)‐α‐d‐glucan 4‐α‐d‐[(1→4)‐α‐d‐glucano]‐transferase; EC 2.4.1.19) is produced with a genetically modified Escherichia coli strain WCM105xpCM703 by Wacker Chemie GmbH. The production strain harbours a self‐replicating multicopy plasmid which contains genes conferring resistance to two highly important antimicrobials for human and veterinary medicine. The food enzyme is free from viable cells of the production organism, but not of its recombinant DNA. Therefore, the food enzyme poses a risk of promoting the spread of antimicrobial resistance genes. It is intended to be used in starch processing for the production of α‐cyclodextrin. Residual amounts of total organic solids (TOS) are removed by the purification steps applied during the production of α‐cyclodextrin; consequently, dietary exposure was not calculated. Genotoxicity tests, although not raising a safety concern, did not comply with the EFSA guideline. The systemic toxicity was assessed by means of a repeated dose 90‐day oral toxicity study in rats. The study was not supplied as a full report. The Panel identified the highest dose tested as the No Observed Adverse Effect Level, which according to the authors of the study corresponds to 260 mg TOS/kg body weight per day. In the absence of information about the sequence homology of this α‐cyclodextrin glucanotransferase with known allergens, the Panel could not complete the assessment on the allergenicity of the food enzyme. The Panel concludes that the food enzyme α‐cyclodextrin glucanotransferase produced with the genetically modified E. coli strain WCM105xpCM703 cannot be considered safe. |
| first_indexed | 2024-12-20T08:41:36Z |
| format | Article |
| id | doaj.art-a8aed8ea8cfa4c38ae81bd0f74deec00 |
| institution | Directory Open Access Journal |
| issn | 1831-4732 |
| language | English |
| last_indexed | 2024-12-20T08:41:36Z |
| publishDate | 2020-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | EFSA Journal |
| spelling | doaj.art-a8aed8ea8cfa4c38ae81bd0f74deec002022-12-21T19:46:23ZengWileyEFSA Journal1831-47322020-10-011810n/an/a10.2903/j.efsa.2020.6248Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP)Vittorio SilanoJosé Manuel Barat BavieraClaudia BolognesiPier Sandro CocconcelliRiccardo CrebelliDavid Michael GottKonrad GrobClaude LambréEvgenia LampiMarcel MengelersAlicja MortensenGilles RivièreInger‐Lise SteffensenChristina TlustosHenk Van LoverenLaurence VernisHolger ZornJaime AguileraNatalia KovalkovicovaYi LiuJoaquim MaiaAndrew ChessonAbstract The food enzyme α‐cyclodextrin glucanotransferase ((1→4)‐α‐d‐glucan 4‐α‐d‐[(1→4)‐α‐d‐glucano]‐transferase; EC 2.4.1.19) is produced with a genetically modified Escherichia coli strain WCM105xpCM703 by Wacker Chemie GmbH. The production strain harbours a self‐replicating multicopy plasmid which contains genes conferring resistance to two highly important antimicrobials for human and veterinary medicine. The food enzyme is free from viable cells of the production organism, but not of its recombinant DNA. Therefore, the food enzyme poses a risk of promoting the spread of antimicrobial resistance genes. It is intended to be used in starch processing for the production of α‐cyclodextrin. Residual amounts of total organic solids (TOS) are removed by the purification steps applied during the production of α‐cyclodextrin; consequently, dietary exposure was not calculated. Genotoxicity tests, although not raising a safety concern, did not comply with the EFSA guideline. The systemic toxicity was assessed by means of a repeated dose 90‐day oral toxicity study in rats. The study was not supplied as a full report. The Panel identified the highest dose tested as the No Observed Adverse Effect Level, which according to the authors of the study corresponds to 260 mg TOS/kg body weight per day. In the absence of information about the sequence homology of this α‐cyclodextrin glucanotransferase with known allergens, the Panel could not complete the assessment on the allergenicity of the food enzyme. The Panel concludes that the food enzyme α‐cyclodextrin glucanotransferase produced with the genetically modified E. coli strain WCM105xpCM703 cannot be considered safe.https://doi.org/10.2903/j.efsa.2020.6248food enzymeα‐cyclodextrin glucanotransferasecyclomaltodextrin glucanotransferaseα‐CGTaseEC 2.4.1.19Escherichia coli |
| spellingShingle | EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP) Vittorio Silano José Manuel Barat Baviera Claudia Bolognesi Pier Sandro Cocconcelli Riccardo Crebelli David Michael Gott Konrad Grob Claude Lambré Evgenia Lampi Marcel Mengelers Alicja Mortensen Gilles Rivière Inger‐Lise Steffensen Christina Tlustos Henk Van Loveren Laurence Vernis Holger Zorn Jaime Aguilera Natalia Kovalkovicova Yi Liu Joaquim Maia Andrew Chesson Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703 EFSA Journal food enzyme α‐cyclodextrin glucanotransferase cyclomaltodextrin glucanotransferase α‐CGTase EC 2.4.1.19 Escherichia coli |
| title | Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703 |
| title_full | Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703 |
| title_fullStr | Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703 |
| title_full_unstemmed | Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703 |
| title_short | Safety evaluation of the food enzyme α‐cyclodextrin glucanotransferase from Escherichia coli strain WCM105xpCM703 |
| title_sort | safety evaluation of the food enzyme α cyclodextrin glucanotransferase from escherichia coli strain wcm105xpcm703 |
| topic | food enzyme α‐cyclodextrin glucanotransferase cyclomaltodextrin glucanotransferase α‐CGTase EC 2.4.1.19 Escherichia coli |
| url | https://doi.org/10.2903/j.efsa.2020.6248 |
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