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Kim MJ, Kim TJ, Kang YJ, Yoo JY, Kim JH. Construction of a Novel Shuttle Vector for Tetragenococcus species based on a Cryptic Plasmid from Tetragenococcus halophilus. J Microbiol Biotechnol 2023; 33:211-218. [PMID: 36575862 PMCID: PMC9998201 DOI: 10.4014/jmb.2209.09024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/30/2022] [Accepted: 12/19/2022] [Indexed: 12/29/2022]
Abstract
A cryptic plasmid (pTH32) was characterized from Tetragenococcus halophilus 32, an isolate from jeotgal, Korean traditional fermented seafood. pTH32 is 3,198 bp in size with G+C content of 35.84%, and contains 4 open reading frames (ORFs). orf1 and orf2 are 456 bp and 273 bp in size, respectively, and their translation products showed 65.16% and 69.35% similarities with RepB family plasmid replication initiators, respectively, suggesting the rolling-circle replication (RCR) mode of pTH32. orf3 and orf4 encodes putative hypothetical protein of 186 and 76 amino acids, respectively. A novel Tetragenococcus-Escherichia coli shuttle vector, pMJ32E (7.3 kb, Emr), was constructed by ligation of pTH32 with pBluescript II KS(+) and an erythromycin resistance gene (ErmC). pMJ32E successfully replicated in Enterococcus faecalis 29212 and T. halophilus 31 but not in other LAB species. A pepA gene, encoding aminopeptidase A (PepA) from T. halophilus CY54, was successfully expressed in T. halophilus 31 using pMJ32E. The transformant (TF) showed higher PepA activity (49.8 U/mg protein) than T. halophilus 31 cell (control). When T. halophilus 31 TF was subculturd in MRS broth without antibiotic at 48 h intervals, 53.8% of cells retained pMJ32E after 96 h, and only 2.4% of cells retained pMJ32E after 14 days, supporting the RCR mode of pTH32. pMJ32E could be useful for the genetic engineering of Tetragenococcus and Enterococcus species.
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Affiliation(s)
- Min Jae Kim
- Division of Applied Life Science (BK21 Four), Graduate School, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Tae Jin Kim
- Division of Applied Life Science (BK21 Four), Graduate School, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Yun Ji Kang
- Division of Applied Life Science (BK21 Four), Graduate School, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Ji Yeon Yoo
- Division of Applied Life Science (BK21 Four), Graduate School, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jeong Hwan Kim
- Division of Applied Life Science (BK21 Four), Graduate School, Gyeongsang National University, Jinju 52828, Republic of Korea.,Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea
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Kim SA, Jang YJ, Heo JE, Li L, Moon JS, Han NS. Complete genome sequence of Leuconostoc citreum EFEL2700, a host strain for transformation of pCB vectors. J Biotechnol 2018; 287:52-58. [DOI: 10.1016/j.jbiotec.2018.08.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 08/01/2018] [Accepted: 08/20/2018] [Indexed: 12/19/2022]
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Elimination of the cryptic plasmid in Leuconostoc citreum by CRISPR/Cas9 system. J Biotechnol 2017; 251:151-155. [DOI: 10.1016/j.jbiotec.2017.04.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 03/15/2017] [Accepted: 04/16/2017] [Indexed: 01/21/2023]
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Construction of a shuttle vector based on the small cryptic plasmid pJY33 from Weissella cibaria 33. Plasmid 2015; 79:30-6. [DOI: 10.1016/j.plasmid.2015.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 03/24/2015] [Accepted: 03/30/2015] [Indexed: 11/21/2022]
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SUKMARINI LINDA, MUSTOPA APONZAENAL, NORMAWATI MARIDHA, MUZDALIFAH IKRIMAH. Identification of Antibiotic-Resistance Genes from Lactic Acid Bacteria in Indonesian Fermented Foods. HAYATI JOURNAL OF BIOSCIENCES 2014. [DOI: 10.4308/hjb.21.3.144] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Chae HS, Lee SH, Lee JH, Park SJ, Lee PC. Use of a novel Escherichia coli-leuconostoc shuttle vector for metabolic engineering of Leuconostoc citreum to overproduce D-lactate. Appl Environ Microbiol 2013; 79:1428-35. [PMID: 23241984 PMCID: PMC3591954 DOI: 10.1128/aem.03291-12] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/10/2012] [Indexed: 12/28/2022] Open
Abstract
Determination of the complete nucleotide sequence of a cryptic plasmid, pMBLT00, from Leuconostoc mesenteroides subsp. mesenteroides KCTC13302 revealed that it contains 20,721 bp, a G+C content of 38.7%, and 18 open reading frames. Comparative sequence and mung been nuclease analyses of pMBLT00 showed that pMBLT00 replicates via the theta replication mechanism. A new, stable Escherichia coli-Leuconostoc shuttle vector, pMBLT02, which was constructed from a theta-replicating pMBLT00 replicon and an erythromycin resistance gene of pE194, was successfully introduced into Leuconostoc, Lactococcus lactis, and Pediococcus. This shuttle vector was used to engineer Leuconostoc citreum 95 to overproduce d-lactate. The L. citreum 95 strain engineered using plasmid pMBLT02, which overexpresses d-lactate dehydrogenase, exhibited enhanced production of optically pure d-lactate (61 g/liter, which is 6 times greater than the amount produced by the control strain) when cultured in a reactor supplemented with 140 g/liter glucose. Therefore, the shuttle vector pMBLT02 can serve as a useful and stable plasmid vector for further development of a d-lactate overproduction system in other Leuconostoc strains and Lactococcus lactis.
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Affiliation(s)
- Han Seung Chae
- Department of Molecular Science and Technology, Ajou University, Woncheon-dong, Yeongtong-gu, Suwon, South Korea
| | - Seung Hwan Lee
- Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology (KRICT), Yuseong-gu, Daejeon, South Korea
| | - Ju-Hoon Lee
- Department of Food Science and Biotechnology, Kyung Hee University, Seocheon-dong, Giheung-gu, Young, South Korea
| | - Si Jae Park
- Department of Energy Science and Technology, Myongji University, Nam-dong, Cheoin-gu, Yongin-si, South Korea
| | - Pyung Cheon Lee
- Department of Molecular Science and Technology, Ajou University, Woncheon-dong, Yeongtong-gu, Suwon, South Korea
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Eom HJ, Moon JS, Cho SK, Kim JH, Han NS. Construction of theta-type shuttle vector for Leuconostoc and other lactic acid bacteria using pCB42 isolated from kimchi. Plasmid 2012; 67:35-43. [DOI: 10.1016/j.plasmid.2011.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 10/19/2011] [Accepted: 11/02/2011] [Indexed: 11/17/2022]
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Eom HJ, Cho SK, Park MS, Ji GE, Han NS. Characterization of Leuconostoc citreum plasmid pCB18 and development of broad host range shuttle vector for lactic acid bacteria. BIOTECHNOL BIOPROC E 2011. [DOI: 10.1007/s12257-010-0089-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Shareck J, Choi Y, Lee B, Miguez CB. Cloning Vectors Based on Cryptic Plasmids Isolated from Lactic Acid Bacteria:Their Characteristics and Potential Applications in Biotechnology. Crit Rev Biotechnol 2010; 24:155-208. [PMID: 15707158 DOI: 10.1080/07388550490904288] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Lactic acid bacteria (LAB) are Gram positive bacteria, widely distributed in nature, and industrially important as they are used in a variety of industrial food fermentations. The use of genetic engineering techniques is an effective means of enhancing the industrial applicability of LAB. However, when using genetic engineering technology, safety becomes an essential factor for the application of improved LAB to the food industry. Cloning and expression systems should be derived preferably from LAB cryptic plasmids that generally encode genes for which functions can be proposed, but no phenotypes can be observed. However, some plasmid-encoded functions have been discovered in cryptic plasmids originating from Lactobacillus, Streptococcus thermophilus, and Pediococcus spp. and can be used as selective marker systems in vector construction. This article presents information concerning LAB cryptic plasmids, and their structures, functions, and applications. A total of 134 cryptic plasmids collated are discussed.
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Affiliation(s)
- Julie Shareck
- Department of Food Science and Agricultural Chemistry, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada
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Jin Q, Jung JY, Kim YJ, Eom HJ, Kim SY, Kim TJ, Han NS. Production of l-lactate in Leuconostoc citreum via heterologous expression of l-lactate dehydrogenase gene. J Biotechnol 2009; 144:160-4. [DOI: 10.1016/j.jbiotec.2009.08.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Revised: 06/29/2009] [Accepted: 08/14/2009] [Indexed: 10/20/2022]
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Eom HJ, Moon JS, Seo EY, Han NS. Heterologous expression and secretion of Lactobacillus amylovorus alpha-amylase in Leuconostoc citreum. Biotechnol Lett 2009; 31:1783-8. [PMID: 19618275 DOI: 10.1007/s10529-009-0079-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 06/23/2009] [Accepted: 06/24/2009] [Indexed: 11/30/2022]
Abstract
To develop a gene expression system for Leuconostoc genus, construction of expression vector and expression of a heterologus protein in Leuconostoc was performed. Alpha-amylase gene from Lactobacillus amylovorus was cloned into a Leuconostoc cloning vector, pLeuCM, with its own signal peptide. pLeuCMamy was introduced into Leuconostoc citreum CB2567 and a successful expression of alpha-amy gene was confirmed by enzyme activity assays. About 90% of alpha-amylase activity was detected in the culture broth, revealing most of expressed alpha-amylase was secreted out cells. The signal sequence of alpha-amy gene is a good candidate for the secretion of heterologous protein by using Leuconostoc host-vector system.
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Affiliation(s)
- Hyun-Ju Eom
- Department of Food Science and Technology, Research Center for Bioresource and Health, Chungbuk National University, Cheongju, 361-763, South Korea
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Thakur RL, Roy U. Antibacterial Activity of Leuconostoc lactis Isolated from Raw Cattle Milk and its Preliminary Optimization for the Bacteriocin Production. ACTA ACUST UNITED AC 2009. [DOI: 10.3923/jm.2009.122.131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Identification of a replicon from pCC3, a cryptic plasmid from Leuconostoc citreum C4 derived from kimchi, and development of a new host–vector system. Biotechnol Lett 2009; 31:685-96. [DOI: 10.1007/s10529-009-9912-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Revised: 12/11/2008] [Accepted: 12/15/2008] [Indexed: 11/27/2022]
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Eom HJ, Jin Q, Moon JS, Jeong JY, Han NS. Development of gene expression/knock-out system for genetic engineering of Leuconostoc Citreum. J Biotechnol 2008. [DOI: 10.1016/j.jbiotec.2008.07.792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jeong SJ, Park JY, Lee HJ, Kim JH. Characterization of pFMBL1, a small cryptic plasmid isolated from Leuconostoc mesenteroides SY2. Plasmid 2007; 57:314-23. [PMID: 17084452 DOI: 10.1016/j.plasmid.2006.09.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2006] [Revised: 08/28/2006] [Accepted: 09/11/2006] [Indexed: 11/27/2022]
Abstract
A 4661bp cryptic plasmid, pFMBL1, was isolated from Leuconostoc mesenteroides SY2, an isolate from Kimchi, and characterized. Nucleotide sequence analysis revealed two open reading frames, orf1 and orf2. orf2 was 453bp in size and its translation product had 58% identity with a putative protein possibly involved in the replication of pTXL1, a cryptic plasmid from L. mesenteroides ssp. mesenteroides Y110. RNA transcript from orf2 was detected but not from orf1 or intergenic region. Minimum 3.5kb fragment encompassing orf1 and orf2 was required for the replication of pFMBL1 and employed for the construction of Escherichia coli-Leuconostoc shuttle vector, pSJ33E. L. mesenteroides SY1 (another Kimchi isolate), Leuconostoc ssp., and Lactobacillus brevis were successfully transformed with pSJ33E, and the transformation efficiencies were ranged between 1.1x10(1) and 4x10(5)transformants/microg DNA. No single-stranded DNA intermediate was detected from L. mesenteroides SY1 cells harboring pSJ33E, indicating that pFMBL1 probably replicated via theta-type mechanism. pSJ33E was stably maintained in L. mesenteroides SY1 in the absence of erythromycin (Em, 5 microg/ml) and after 1 month of daily subculturing in MRS broth without selective pressure, three percent of cells still retained pSJ33E.
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Affiliation(s)
- Seon-Ju Jeong
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Jinju, Republic of Korea
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Chae JC, Kim CK, Zylstra GJ. Characterization of two small cryptic plasmids from Pseudomonas sp. strain S-47. Biochem Biophys Res Commun 2005; 338:1600-6. [PMID: 16288725 DOI: 10.1016/j.bbrc.2005.10.135] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2005] [Accepted: 10/21/2005] [Indexed: 11/20/2022]
Abstract
Two small cryptic plasmids, p47L and p47S, identified in Pseudomonas sp. S-47 were characterized by determination of DNA sequences and physical and functional maps. They are 3084 and 1782 bp in length, respectively, with GC contents of 63.55 and 65.21%. The detection of single-strand DNAs of both plasmids indicates that they replicate by a rolling-circle mechanism. The deduced polypeptide encoded by the rep gene of p47L is homologous with Rep proteins of plasmids belonging to the pIJ101/pJV1 family, which are known to replicate by the rolling-circle mechanism. Despite containing a homologous signature with Rep proteins of rolling-circle replicating (RCR) plasmids in the pT181 family, the Rep of p47S lacks significant homology with Rep proteins of this family and is missing a region similar to the family's replication origin (dso). Based on the rep sequence comparisons, p47L falls into a previously defined plasmid family whereas p47S defines a new family of RCR plasmid.
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Affiliation(s)
- Jong-Chan Chae
- Biotechnology Center for Agriculture and the Environment, Rutgers University, New Brunswick, NJ 08901, USA
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Park J, Lee M, Jung J, Kim J. pIH01, a small cryptic plasmid from Leuconostoc citreum IH3. Plasmid 2005; 54:184-9. [PMID: 15904957 DOI: 10.1016/j.plasmid.2005.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2004] [Revised: 03/19/2005] [Accepted: 03/22/2005] [Indexed: 10/25/2022]
Abstract
A small cryptic plasmid pIH01 from Leuconostoc citreum IH3 was characterized. This 1.8-kb sized plasmid contains single open reading frame that encodes a RepC class protein (342 amino acids) and a conserved pT181-type double strand origin, suggesting a rolling circle replication mode. This putative replicase protein shows the highest similarity to a replicase from pFR18 plasmid of Leuconostoc mesenteroides FR52 (64% identity), one of the pT181-type rolling circle plasmid family and contains a strictly conserved RepC-type active site sequence of pT181 family. A shuttle vector that was developed on the basis of this cryptic plasmid by insertion of both erythromycin resistance gene (ermC) from pE194 and Escherichia coli ColE1 origin was able to transform Leuconostoc strains, Lactobacillus plantarum, and Lactococcus lactis. Therefore, pIH01 derivative plasmids might be useful for the manipulation of Leuconostoc strains.
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Affiliation(s)
- Junghyun Park
- Department of Biological Sciences, Inha University, Inchon 402-751, Republic of Korea
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Park WJ, Lee KH, Lee JM, Lee HJ, Kim JH, Lee JH, Chang HC, Chung DK. Characterization of pC7 from Lactobacillus paraplantarum C7 derived from Kimchi and development of lactic acid bacteria–Escherichia coli shuttle vector. Plasmid 2004; 52:84-8. [PMID: 15336486 DOI: 10.1016/j.plasmid.2004.05.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2004] [Revised: 05/13/2004] [Indexed: 10/26/2022]
Abstract
A cryptic plasmid pC7 was characterized, which was isolated from Lactobacillus paraplantarum C7 derived from Kimchi, a traditional korean vegetable food. The plasmid pC7 is a circular molecule of 2,134 base-pairs in length with a G + C content of 38.5%. The nucleotide sequence analysis revealed the presence of an open reading frame encoding a putative 317 amino acids protein homologous to replication proteins RepA. Furthermore, a putative double and a single-strand origin were identified. Together with features of nucleotide sequences, the detection of single-stranded intermediate DNA in Lb. paraplantarum demonstrated that pC7 replicates via a rolling circle mechanism. A cloning vector for lactic acid bacteria was developed on the basis of the pC7 replicon, into which were inserted an erythromycin resistance gene as a marker, multiple cloning sites, and Escherichia coli ColE1 replication origin. E. coli and several species of Lactobacillus and Leuconostoc can be transformed with the resultant vector. Therefore, pC7 derivatives may be useful LAB-E. coli shuttle vectors, which are essential in engineering important strains in food fermentation.
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Affiliation(s)
- Woo Jung Park
- School of Biotechnology and Institute of Life Science and Resources, Kyung Hee University, Suwon 449-701, Republic of Korea
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Hemme D, Foucaud-Scheunemann C. Leuconostoc, characteristics, use in dairy technology and prospects in functional foods. Int Dairy J 2004. [DOI: 10.1016/j.idairyj.2003.10.005] [Citation(s) in RCA: 194] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Probiotics have many potential therapeutic uses, but have not been universally accepted because of a lack of understanding of their action. Lactic acid bacteria (LAB) have been modified by traditional and genetic engineering methods to produce new varieties. Modern techniques of molecular biology have facilitated the identification of probiotic LAB strains, but only a few LAB have been modified by recombinant-DNA technology because of consumer resistance to their introduction to markets, especially in Europe.
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Affiliation(s)
- Farid E Ahmed
- Department of Radiation Oncology, LSB 014, Leo W. Jenkins Cancer Center, The Brody School of Medicine, East Carolina University, Greenville, NC 27858, USA.
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Biet F, Cenatiempo Y, Fremaux C. Identification of a replicon from pTXL1, a small cryptic plasmid from Leuconostoc mesenteroides subsp. mesenteroides Y110, and development of a food-grade vector. Appl Environ Microbiol 2002; 68:6451-6. [PMID: 12450877 PMCID: PMC134450 DOI: 10.1128/aem.68.12.6451-6456.2002] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2002] [Accepted: 09/05/2002] [Indexed: 11/20/2022] Open
Abstract
A 2,665-bp cryptic plasmid, pTXL1, isolated from Leuconostoc mesenteroides subsp. mesenteroides Y110 was identified. This plasmid harbors a replicon localized on a 1,300-bp fragment. Two observations suggested that pTXL1 does not belong to rolling-circle replication (RCR)-type plasmids and most likely replicates via a theta mechanism. These hypotheses are supported by the observation that no detectable single-stranded intermediate was found for the replicon and that, unlike in RCR-type plasmids, the pTXL1 replicon sequence lacks an open reading frame encoding a replicase. The small-sized pTXL1 plasmid is stable and, according to its origin, can be considered in the "generally recognized as safe" category. Its ability to replicate in several lactic acid bacteria was exploited to develop a vector producing mesentericin Y105, a class II anti-Listeria bacteriocin. With this new vector, a recombinant industrial Leuconostoc cremoris strain able to produce mesentericin Y105 was constructed.
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Affiliation(s)
- Franck Biet
- Institut de Biologie Moléculaire et d'Ingénierie Génétique, Equipe d'Accueil 2224, Université de Poitiers, 86022 Poitiers Cedex, France.
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Renault P. Genetically modified lactic acid bacteria: applications to food or health and risk assessment. Biochimie 2002; 84:1073-87. [PMID: 12595135 DOI: 10.1016/s0300-9084(02)00029-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Lactic acid bacteria have a long history of use in fermented food products. Progress in gene technology allows their modification by introducing new genes or by modifying their metabolic functions. These modifications may lead to improvements in food technology (bacteria better fitted to technological processes, leading to improved organoleptic properties em leader ), or to new applications including bacteria producing therapeutic molecules that could be delivered by mouth. Examples in these two fields will be discussed, at the same time evaluating their potential benefit to society and the possible risks associated with their use. Risk assessment and expected benefits will determine the future use of modified bacteria in the domains of food technology and health.
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Affiliation(s)
- Pierre Renault
- Génétique microbienne, Inra, domaine de Vilvert, 78352 Jouy-en-Josas, France.
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Shao W, Lee AY, Gulnik S, Gustchina E, Liu YL, Kung H, Erickson JW. A novel putative transcription factor protein MYT2 that preferentially binds supercoiled DNA and induces DNA synthesis in quiescent cells. FEBS Lett 2000; 473:363-9. [PMID: 10818241 DOI: 10.1016/s0014-5793(00)01536-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Myelin transcription factor 2 (MYT2), a putative transcription factor found in the human central nervous system, was cloned from an expression cDNA library from human T-cells. MYT2 shares weak similarity to bacterial type I topoisomerases and shares 63% sequence identity to a replicase from Leuconostoc mesenteroides. MYT2 preferentially binds supercoiled DNA (scDNA). Incubation of MYT2 and scDNA at or above equal molar ratios generated topoisomer-like patterns that were abolished by deproteination. Thus, MYT2 appears to relax scDNA via a non-enzymatic mechanism. The banding pattern of MYT2-scDNA complexes was shown to be quantisized, saturable and sequence-independent. Microinjection of MYT2 mRNA induced G(o) growth-arrested NIH 3T3 cells to enter the S phase of the cell cycle.
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Affiliation(s)
- W Shao
- Structural Biochemistry Program, SAIC Frederick, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, MD 21702, USA.
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