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Bassett S, Da Silva NA. Engineering a carbon source-responsive promoter for improved biosynthesis in the non-conventional yeast Kluyveromyces marxianus. Metab Eng Commun 2024; 18:e00238. [PMID: 38845682 PMCID: PMC11153928 DOI: 10.1016/j.mec.2024.e00238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Accepted: 05/17/2024] [Indexed: 06/09/2024] Open
Abstract
Many desired biobased chemicals exhibit a range of toxicity to microbial cell factories, making industry-level biomanufacturing more challenging. Separating microbial growth and production phases is known to be beneficial for improving production of toxic products. Here, we developed a novel synthetic carbon-responsive promoter for use in the rapidly growing, stress-tolerant yeast Kluyveromyces marxianus, by fusing carbon-source responsive elements of the native ICL1 promoter to the strong S. cerevisiae TDH3 or native NC1 promoter cores. Two hybrids, P IT350 and P IN450 , were validated via EGFP fluorescence and demonstrated exceptional strength, partial repression during growth, and late phase activation in glucose- and lactose-based medium, respectively. Expressing the Gerbera hybrida 2-pyrone synthase (2-PS) for synthesis of the polyketide triacetic acid lactone (TAL) under the control of P IN450 increased TAL more than 50% relative to the native NC1 promoter, and additional promoter engineering further increased TAL titer to 1.39 g/L in tube culture. Expression of the Penicillium griseofulvum 6-methylsalicylic acid synthase (6-MSAS) under the control of P IN450 resulted in a 6.6-fold increase in 6-MSA titer to 1.09 g/L and a simultaneous 1.5-fold increase in cell growth. Finally, we used P IN450 to express the Pseudomonas savastanoi IaaM and IaaH proteins and the Salvia pomifera sabinene synthase protein to improve production of the auxin hormone indole-3-acetic acid and the monoterpene sabinene, respectively, both extremely toxic to yeast. The development of carbon-responsive promoters adds to the synthetic biology toolbox and available metabolic engineering strategies for K. marxianus, allowing greater control over heterologous protein expression and improved production of toxic metabolites.
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Affiliation(s)
- Shane Bassett
- Department of Chemical & Biomolecular Engineering, University of California, Irvine, CA, 92697-2580, USA
| | - Nancy A. Da Silva
- Department of Chemical & Biomolecular Engineering, University of California, Irvine, CA, 92697-2580, USA
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Genetic and Physiological Characterization of Fructose-1,6-Bisphosphate Aldolase and Glyceraldehyde-3-Phosphate Dehydrogenase in the Crabtree-Negative Yeast Kluyveromyces lactis. Int J Mol Sci 2022; 23:ijms23020772. [PMID: 35054955 PMCID: PMC8776025 DOI: 10.3390/ijms23020772] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/09/2022] [Accepted: 01/10/2022] [Indexed: 02/01/2023] Open
Abstract
The milk yeast Kluyveromyces lactis degrades glucose through glycolysis and the pentose phosphate pathway and follows a mainly respiratory metabolism. Here, we investigated the role of two reactions which are required for the final steps of glucose degradation from both pathways, as well as for gluconeogenesis, namely fructose-1,6-bisphosphate aldolase (FBA) and glyceraldehyde-3-phosphate dehydrogenase (GAPDH). In silico analyses identified one gene encoding the former (KlFBA1), and three genes encoding isoforms of the latter (KlTDH1, KlTDH2, KlGDP1). Phenotypic analyses were performed by deleting the genes from the haploid K. lactis genome. While Klfba1 deletions lacked detectable FBA activity, they still grew poorly on glucose. To investigate the in vivo importance of the GAPDH isoforms, different mutant combinations were analyzed for their growth behavior and enzymatic activity. KlTdh2 represented the major glycolytic GAPDH isoform, as its lack caused a slower growth on glucose. Cells lacking both KlTdh1 and KlTdh2 failed to grow on glucose but were still able to use ethanol as sole carbon sources, indicating that KlGdp1 is sufficient to promote gluconeogenesis. Life-cell fluorescence microscopy revealed that KlTdh2 accumulated in the nucleus upon exposure to oxidative stress, suggesting a moonlighting function of this isoform in the regulation of gene expression. Heterologous complementation of the Klfba1 deletion by the human ALDOA gene renders K. lactis a promising host for heterologous expression of human disease alleles and/or a screening system for specific drugs.
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Musielak M, Sterk CC, Schubert F, Meyer C, Paululat A, Heinisch JJ. The small GTPase KlRho5 responds to oxidative stress and affects cytokinesis. J Cell Sci 2021; 134:271953. [PMID: 34435638 DOI: 10.1242/jcs.258301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 08/19/2021] [Indexed: 01/11/2023] Open
Abstract
Rho5 is the yeast homolog of the human small GTPase Rac1. We characterized the genes encoding Rho5 and the subunits of its dimeric activating guanine-nucleotide-exchange factor (GEF), Dck1 and Lmo1, in the yeast Kluyveromyces lactis. Rapid translocation of the three GFP-tagged components to mitochondria upon oxidative stress and carbon starvation indicate a similar function of KlRho5 in energy metabolism and mitochondrial dynamics as described for its Saccharomyces cerevisiae homolog. Accordingly, Klrho5 deletion mutants are hyper-resistant towards hydrogen peroxide. Moreover, synthetic lethalities of rho5 deletions with key components in nutrient sensing, such as sch9 and gpr1, are not conserved in K. lactis. Instead, Klrho5 deletion mutants display morphological defects with strengthened lateral cell walls and protruding bud scars. The latter result from aberrant cytokinesis, as observed by following the budding process in vivo and by transmission electron microscopy of the bud neck region. This phenotype can be suppressed by KlCDC42G12V, which encodes a hyper-active variant. Data from live-cell fluorescence microscopy support the notion that KlRho5 interferes with the actin moiety of the contractile actomyosin ring, with consequences different from those previously reported for mutants lacking myosin.
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Affiliation(s)
- Marius Musielak
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Genetik, Barbarastr. 11, D-49076 Osnabrück, Germany
| | - Carolin C Sterk
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Genetik, Barbarastr. 11, D-49076 Osnabrück, Germany
| | - Felix Schubert
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Genetik, Barbarastr. 11, D-49076 Osnabrück, Germany
| | - Christian Meyer
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Zoologie, Barbarastr. 11, D-49076 Osnabrück, Germany
| | - Achim Paululat
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Zoologie, Barbarastr. 11, D-49076 Osnabrück, Germany
| | - Jürgen J Heinisch
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Genetik, Barbarastr. 11, D-49076 Osnabrück, Germany
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Two homologs of the Cat8 transcription factor are involved in the regulation of ethanol utilization in Komagataella phaffii. Curr Genet 2021; 67:641-661. [PMID: 33725138 PMCID: PMC8254726 DOI: 10.1007/s00294-021-01165-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 02/17/2021] [Accepted: 02/18/2021] [Indexed: 11/26/2022]
Abstract
The transcription factors Cat8 and Sip4 were described in Saccharomyces cerevisiae and Kluyveromyces lactis to have very similar DNA binding domains and to be necessary for derepression of a variety of genes under non-fermentative growth conditions via binding to the carbon source responsive elements (CSREs). The methylotrophic yeast Komagataella phaffii (syn Pichia pastoris) has two transcription factors (TFs), which are putative homologs of Cat8 based on sequence similarity, termed Cat8-1 and Cat8-2. It is yet unclear in which cellular processes they are involved and if one of them is actually the homolog of Sip4. To study the roles of the Cat8 homologs in K. phaffii, overexpression or deletion strains were generated for the two TFs. The ability of these mutant strains to grow on different carbon sources was tested, and transcript levels of selected genes from the carbon metabolism were quantified. Our experiments showed that the TFs are required for the growth of K. phaffii on C2 carbon sources, but not on glucose, glycerol or methanol. K. phaffii deleted for Cat8-1 showed impaired growth on acetate, while both Cat8-1 and Cat8-2 are involved in the growth of K. phaffii on ethanol. Correspondingly, both TFs are participating in the activation of ADH2, ALD4 and ACS1, three genes encoding enzymes important for the assimilation of ethanol. Different from S. cerevisiae and K. lactis, Cat8-1 is not regulating the transcription of the putative Sip4-family member Cat8-2 in K. phaffii. Furthermore, Cat8-1 is necessary for the activation of genes from the glyoxylate cycle, whereas Cat8-2 is necessary for the activation of genes from the carnitine shuttle. Neither Cat8-1 nor Cat8-2 are required for the activation of gluconeogenesis genes. Finally, the CAT8-2 gene is repressed by the Mig1-2 transcription factor on glucose and autorepressed by the Cat8-2 protein on all tested carbon sources. Our study identified the involvement of K. phaffii Cat8-1 and Cat8-2 in C2-metabolism, and highlighted similarities and differences to their homologs in other yeast species.
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A Novel Regulated Hybrid Promoter That Permits Autoinduction of Heterologous Protein Expression in Kluyveromyces lactis. Appl Environ Microbiol 2019; 85:AEM.00542-19. [PMID: 31053583 PMCID: PMC6606884 DOI: 10.1128/aem.00542-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 04/30/2019] [Indexed: 11/28/2022] Open
Abstract
The yeast Kluyveromyces lactis is an important host for the expression of recombinant proteins at both laboratory and industrial scales. However, the system lacks a tightly regulated promoter that permits controlled expression of heterologous proteins. In this study, we report the engineering of a highly regulated strong hybrid promoter (termed P350) for use in K. lactis. P350 is tightly repressed by glucose or glycerol in the medium but strongly promotes gene expression once the carbon source has been consumed by the cells. This feature permits heterologous protein expression to be “autoinduced” at any scale without the addition of a gratuitous inducer molecule or changing feed solutions. The yeast Kluyveromyces lactis has been a successful host for the production of heterologous proteins for over 30 years. Currently, the galactose-/lactose-inducible and glucose-repressible LAC4 promoter (PLAC4) is the most widely used promoter to drive recombinant protein expression in K. lactis. However, PLAC4 is not fully repressed in the presence of glucose and significant protein expression still occurs. Thus, PLAC4 is not suitable in processes where tight regulation of heterologous gene expression is required. In this study, we devised a novel K. lactis promoter system that is both strong and tightly controllable. We first tested several different endogenous K. lactis promoters for their ability to express recombinant proteins. A novel hybrid promoter (termed P350) was created by combining segments of two K. lactis promoters, namely, the strong constitutive PGAP1 promoter and the carbon source-sensitive PICL1 promoter. We demonstrate that P350 is tightly repressed in the presence of glucose or glycerol and becomes derepressed upon depletion of these compounds by the growing cells. We further illustrate the utility of P350-controlled protein expression in shake flask and high-cell-density bioreactor cultivation strategies. The P350 hybrid promoter is a strong derepressible promoter for use in autoinduction of one-step fermentation processes for the production of heterologous proteins in K. lactis. IMPORTANCE The yeast Kluyveromyces lactis is an important host for the expression of recombinant proteins at both laboratory and industrial scales. However, the system lacks a tightly regulated promoter that permits controlled expression of heterologous proteins. In this study, we report the engineering of a highly regulated strong hybrid promoter (termed P350) for use in K. lactis. P350 is tightly repressed by glucose or glycerol in the medium but strongly promotes gene expression once the carbon source has been consumed by the cells. This feature permits heterologous protein expression to be “autoinduced” at any scale without the addition of a gratuitous inducer molecule or changing feed solutions.
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Mojardín L, Vega M, Moreno F, Schmitz HP, Heinisch JJ, Rodicio R. Lack of the NAD+-dependent glycerol 3-phosphate dehydrogenase impairs the function of transcription factors Sip4 and Cat8 required for ethanol utilization in Kluyveromyces lactis. Fungal Genet Biol 2018; 111:16-29. [DOI: 10.1016/j.fgb.2017.11.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 11/19/2017] [Accepted: 11/21/2017] [Indexed: 11/25/2022]
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Mehlgarten C, Krijger JJ, Lemnian I, Gohr A, Kasper L, Diesing AK, Grosse I, Breunig KD. Divergent Evolution of the Transcriptional Network Controlled by Snf1-Interacting Protein Sip4 in Budding Yeasts. PLoS One 2015; 10:e0139464. [PMID: 26440109 PMCID: PMC4634231 DOI: 10.1371/journal.pone.0139464] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 09/14/2015] [Indexed: 11/19/2022] Open
Abstract
Cellular responses to starvation are of ancient origin since nutrient limitation has always been a common challenge to the stability of living systems. Hence, signaling molecules involved in sensing or transducing information about limiting metabolites are highly conserved, whereas transcription factors and the genes they regulate have diverged. In eukaryotes the AMP-activated protein kinase (AMPK) functions as a central regulator of cellular energy homeostasis. The yeast AMPK ortholog SNF1 controls the transcriptional network that counteracts carbon starvation conditions by regulating a set of transcription factors. Among those Cat8 and Sip4 have overlapping DNA-binding specificity for so-called carbon source responsive elements and induce target genes upon SNF1 activation. To analyze the evolution of the Cat8-Sip4 controlled transcriptional network we have compared the response to carbon limitation of Saccharomyces cerevisiae to that of Kluyveromyces lactis. In high glucose, S. cerevisiae displays tumor cell-like aerobic fermentation and repression of respiration (Crabtree-positive) while K. lactis has a respiratory-fermentative life-style, respiration being regulated by oxygen availability (Crabtree-negative), which is typical for many yeasts and for differentiated higher cells. We demonstrate divergent evolution of the Cat8-Sip4 network and present evidence that a role of Sip4 in controlling anabolic metabolism has been lost in the Saccharomyces lineage. We find that in K. lactis, but not in S. cerevisiae, the Sip4 protein plays an essential role in C2 carbon assimilation including induction of the glyoxylate cycle and the carnitine shuttle genes. Induction of KlSIP4 gene expression by KlCat8 is essential under these growth conditions and a primary function of KlCat8. Both KlCat8 and KlSip4 are involved in the regulation of lactose metabolism in K. lactis. In chromatin-immunoprecipitation experiments we demonstrate binding of both, KlSip4 and KlCat8, to selected CSREs and provide evidence that KlSip4 counteracts KlCat8-mediated transcription activation by competing for binding to some but not all CSREs. The finding that the hierarchical relationship of these transcription factors differs between K. lactis and S. cerevisiae and that the sets of target genes have diverged contributes to explaining the phenotypic differences in metabolic life-style.
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Affiliation(s)
| | - Jorrit-Jan Krijger
- Institute of Biology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Ioana Lemnian
- Institute of Computer Science, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - André Gohr
- Institute of Computer Science, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Lydia Kasper
- Institute of Biology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | | | - Ivo Grosse
- Institute of Computer Science, Martin Luther University Halle-Wittenberg, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Karin D. Breunig
- Institute of Biology, Martin Luther University Halle-Wittenberg, Halle, Germany
- * E-mail:
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Metabolism of Hydrophobic Carbon Sources and Regulation of It inn-Alkane-Assimilating YeastYarrowia lipolytica. Biosci Biotechnol Biochem 2014; 77:1149-54. [DOI: 10.1271/bbb.130164] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
In the oleaginous yeast Yarrowia lipolytica, de novo lipid synthesis and accumulation are induced under conditions of nitrogen limitation (or a high carbon-to-nitrogen ratio). The regulatory pathway responsible for this induction has not been identified. Here we report that the SNF1 pathway plays a key role in the transition from the growth phase to the oleaginous phase in Y. lipolytica. Strains with a Y. lipolytica snf1 (Ylsnf1) deletion accumulated fatty acids constitutively at levels up to 2.6-fold higher than those of the wild type. When introduced into a Y. lipolytica strain engineered to produce omega-3 eicosapentaenoic acid (EPA), Ylsnf1 deletion led to a 52% increase in EPA titers (7.6% of dry cell weight) over the control. Other components of the Y. lipolytica SNF1 pathway were also identified, and their function in limiting fatty acid accumulation is suggested by gene deletion analyses. Deletion of the gene encoding YlSnf4, YlGal83, or YlSak1 significantly increased lipid accumulation in both growth and oleaginous phases compared to the wild type. Furthermore, microarray and quantitative reverse transcription-PCR (qRT-PCR) analyses of the Ylsnf1 mutant identified significantly differentially expressed genes during de novo lipid synthesis and accumulation in Y. lipolytica. Gene ontology analysis found that these genes were highly enriched with genes involved in lipid metabolism. This work presents a new role for Snf1/AMP-activated protein kinase (AMPK) pathways in lipid accumulation in this oleaginous yeast.
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Rodicio R, Heinisch JJ. Yeast on the milky way: genetics, physiology and biotechnology of Kluyveromyces lactis. Yeast 2013; 30:165-77. [PMID: 23576126 DOI: 10.1002/yea.2954] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Revised: 03/08/2013] [Accepted: 03/12/2013] [Indexed: 11/08/2022] Open
Abstract
The milk yeast Kluyveromyces lactis has a life cycle similar to that of Saccharomyces cerevisiae and can be employed as a model eukaryote using classical genetics, such as the combination of desired traits, by crossing and tetrad analysis. Likewise, a growing set of vectors, marker cassettes and tags for fluorescence microscopy are available for manipulation by genetic engineering and investigating its basic cell biology. We here summarize these applications, as well as the current knowledge regarding its central metabolism, glucose and extracellular stress signalling pathways. A short overview on the biotechnological potential of K. lactis concludes this review.
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Affiliation(s)
- Rosaura Rodicio
- Departamento de Bioquímica y Biología Molecular and Instituto Universitario de Biotecnología de Asturias, Universidad de Oviedo, Spain
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Mori K, Iwama R, Kobayashi S, Horiuchi H, Fukuda R, Ohta A. Transcriptional repression by glycerol of genes involved in the assimilation ofn-alkanes and fatty acids in yeastYarrowia lipolytica. FEMS Yeast Res 2013; 13:233-40. [DOI: 10.1111/1567-1364.12025] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2012] [Revised: 11/28/2012] [Accepted: 12/10/2012] [Indexed: 10/27/2022] Open
Affiliation(s)
- Katsuki Mori
- Department of Biotechnology; The University of Tokyo; Tokyo; Japan
| | - Ryo Iwama
- Department of Biotechnology; The University of Tokyo; Tokyo; Japan
| | | | | | - Ryouichi Fukuda
- Department of Biotechnology; The University of Tokyo; Tokyo; Japan
| | - Akinori Ohta
- Department of Biotechnology; The University of Tokyo; Tokyo; Japan
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Heinisch JJ, Buchwald U, Gottschlich A, Heppeler N, Rodicio R. A tool kit for molecular genetics of Kluyveromyces lactis comprising a congenic strain series and a set of versatile vectors. FEMS Yeast Res 2010; 10:333-42. [PMID: 20522115 DOI: 10.1111/j.1567-1364.2009.00604.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
A set of different marker deletions starting with a ura3 derivative of the Kluyveromyces lactis type strain CBS2359 was constructed. After a first cross to obtain a strain with the opposite mating type that also carried a leu2 allele, continuous back-crosses were used to obtain a congenic strain series with different marker combinations, including deletions in KlHIS3, KlADE2 and KlLAC4. Enzymes involved in carbohydrate metabolism were shown to behave very similarly to the original type strain and other K. lactis strains investigated previously. Moreover, a vector series of Saccharomyces cerevisiae genes flanked by loxP sites was constructed to be used as heterologous deletion cassettes in K. lactis, together with two plasmids for expression of Cre-recombinase for marker regeneration. To increase the frequency of homologous recombination, the Klku80 deletion was also introduced into the congenic strain series. A PCR-based method for determination of mating type is provided.
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Affiliation(s)
- Jürgen J Heinisch
- Universität Osnabrück, Fachbereich Biologie/Chemie, AG Genetik, Osnabrück, Germany.
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Saliola M, D'Amici S, Sponziello M, Mancini P, Tassone P, Falcone C. The transdehydrogenase genes KlNDE1 and KlNDI1 regulate the expression of KlGUT2 in the yeast Kluyveromyces lactis. FEMS Yeast Res 2010; 10:518-26. [PMID: 20491935 DOI: 10.1111/j.1567-1364.2010.00631.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
KlNDE1 and KlNDI1 code for two inner mitochondrial membrane transdehydrogenases involved in the maintenance of the intracellular NAD(P)H redox balance. The function of these genes during the utilization of fermentative and respiratory carbon sources was studied. During growth in glucose, deletion of KlNDE1 and KlNDI1 led to an altered kinetic of ethanol and glycerol accumulation compared with the wild type; in addition, KlndiDelta was unable to grow in respiratory substrates. Northern analysis and GFP-fusion experiments showed that KlNDE1 and KlNDI1 regulate the expression of KlGUT2, a component of the glycerol-3-phosphate shuttle. Moreover, both genes seem to be involved in the biogenesis of the mitochondrial tubular network.
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Affiliation(s)
- Michele Saliola
- Department of Cell and Developmental Biology, University of Rome La Sapienza, Rome, Italy.
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Current awareness on yeast. Yeast 2006. [DOI: 10.1002/yea.1617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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