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However, artemisinin is in short supply and unaffordable to most malaria patients. Artemisinin can be semi-synthesized from its precursor artemisinic acid, which can be synthesized from simple sugars using microorganisms genetically engineered with genes from\n                      <jats:italic>A. annua<\/jats:italic>\n                      . In order to develop an industrially competent yeast strain, detailed analyses of microbial physiology and development of gene expression strategies are required.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Three plant genes coding for amorphadiene synthase, amorphadiene oxidase (\n                      <jats:italic>AMO<\/jats:italic>\n                      or\n                      <jats:italic>CYP71AV1<\/jats:italic>\n                      ), and cytochrome P450 reductase, which in concert divert carbon flux from farnesyl diphosphate to artemisinic acid, were expressed from a single plasmid. The artemisinic acid production in the engineered yeast reached 250 \u03bcg mL\n                      <jats:sup>-1<\/jats:sup>\n                      in shake-flask cultures and 1 g L\n                      <jats:sup>-1<\/jats:sup>\n                      in bio-reactors with the use of\n                      <jats:italic>Leu2d<\/jats:italic>\n                      selection marker and appropriate medium formulation. When plasmid stability was measured, the yeast strain synthesizing amorphadiene alone maintained the plasmid in 84% of the cells, whereas the yeast strain synthesizing artemisinic acid showed poor plasmid stability. Inactivation of AMO by a point-mutation restored the high plasmid stability, indicating that the low plasmid stability is not caused by production of the AMO protein but by artemisinic acid synthesis or accumulation. Semi-quantitative reverse-transcriptase (RT)-PCR and quantitative real time-PCR consistently showed that pleiotropic drug resistance (\n                      <jats:italic>PDR<\/jats:italic>\n                      ) genes, belonging to the family of ATP-Binding Cassette (ABC) transporter, were massively induced in the yeast strain producing artemisinic acid, relative to the yeast strain producing the hydrocarbon amorphadiene alone. Global transcriptional analysis by yeast microarray further demonstrated that the induction of drug-resistant genes such as ABC transporters and major facilitator superfamily (MSF) genes is the primary cellular stress-response; in addition, oxidative and osmotic stress responses were observed in the engineered yeast.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The data presented here suggest that the engineered yeast producing artemisinic acid suffers oxidative and drug-associated stresses. The use of plant-derived transporters and optimizing AMO activity may improve the yield of artemisinic acid production in the engineered yeast.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/1472-6750-8-83","type":"journal-article","created":{"date-parts":[[2008,11,5]],"date-time":"2008-11-05T02:13:37Z","timestamp":1225851217000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":174,"title":["Induction of multiple pleiotropic drug resistance genes in yeast engineered to produce an increased level of anti-malarial drug precursor, artemisinic acid"],"prefix":"10.1186","volume":"8","author":[{"given":"Dae-Kyun","family":"Ro","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario","family":"Ouellet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric M","family":"Paradise","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Helcio","family":"Burd","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diana","family":"Eng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris J","family":"Paddon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jack D","family":"Newman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jay D","family":"Keasling","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2008,11,4]]},"reference":[{"key":"352_CR1","doi-asserted-by":"publisher","first-page":"408","DOI":"10.1038\/nchembio.2007.5","volume":"3","author":"J Gershenzon","year":"2007","unstructured":"Gershenzon J, Dudareva N: The function of terpene natural products in the natural world. 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