{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T01:51:03Z","timestamp":1783993863286,"version":"3.55.0"},"reference-count":42,"publisher":"Oxford University Press (OUP)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2015,5,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Objectives<\/jats:title>\n                  <jats:p>Cryptococcus gattii from the North American Northwest (NW) have higher azole MICs than do non-NW C. gattii or Cryptococcus neoformans. Since mechanisms of azole resistance in C. gattii are not known, we identified C. gattii and C. neoformans plasma membrane azole efflux pumps and characterized their properties.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>The C. gattii R265 genome was searched for orthologues of known fungal azole efflux genes, expression of candidate genes was assessed by RT\u2013PCR and the expressed genes' cDNAs were cloned and expressed in Saccharomyces cerevisiae. Azole MICs and intracellular [3H]fluconazole were measured in C. gattii and C. neoformans and in S. cerevisiae expressing each cDNA of interest, as was [3H]fluconazole uptake by post-Golgi vesicles (PGVs) isolated from S. cerevisiae sec6-4 mutants expressing each cDNA of interest.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>Intracellular [3H]fluconazole concentrations were inversely correlated with fluconazole MICs only in 25 NW C. gattii strains. S. cerevisiae expressing three C. gattii cDNAs (encoded by orthologues of C. neoformans AFR1 and MDR1 and the previously unstudied gene AFR2) and their C. neoformans counterparts had higher azole MICs and lower intracellular [3H]fluconazole concentrations than did empty-vector controls. PGVs from S. cerevisiae expressing all six Cryptococcus cDNAs also accumulated more [3H]fluconazole than did controls, and [3H]fluconazole transport by all six transporters of interest was ATP dependent and was inhibited by excess unlabelled fluconazole, voriconazole, itraconazole and posaconazole.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>We conclude that C. gattii and C. neoformans AFR1, MDR1 and AFR2 encode ABC transporters that pump multiple azoles out of S. cerevisiae cells, thereby causing azole resistance.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/jac\/dku554","type":"journal-article","created":{"date-parts":[[2015,1,29]],"date-time":"2015-01-29T04:31:38Z","timestamp":1422505898000},"page":"1396-1407","source":"Crossref","is-referenced-by-count":48,"title":["Identification and properties of plasma membrane azole efflux pumps from the pathogenic fungi <i>Cryptococcus gattii<\/i> and <i>Cryptococcus neoformans<\/i>"],"prefix":"10.1093","volume":"70","author":[{"suffix":"Jr","given":"Luiz R.","family":"Basso","sequence":"first","affiliation":[{"name":"1 \u00a0Infectious Diseases Division, Department of Medicine, Oregon Health & Science University, Portland, OR, USA"},{"name":"2 \u00a0Department of Cellular and Molecular Biology and Pathogenic Bioagents, Faculty of Medicine of Ribeir\u00e3o Preto, University of S\u00e3o Paulo, Ribeir\u00e3o Preto, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charles E.","family":"Gast","sequence":"additional","affiliation":[{"name":"1 \u00a0Infectious Diseases Division, Department of Medicine, Oregon Health & Science University, Portland, OR, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Igor","family":"Bruzual","sequence":"additional","affiliation":[{"name":"1 \u00a0Infectious Diseases Division, Department of Medicine, Oregon Health & Science University, Portland, OR, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian","family":"Wong","sequence":"additional","affiliation":[{"name":"1 \u00a0Infectious Diseases Division, Department of Medicine, Oregon Health & Science University, Portland, OR, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2015,1,27]]},"reference":[{"key":"2022020121022594000_DKU554C1","doi-asserted-by":"crossref","first-page":"1188","DOI":"10.1093\/cid\/cir723","article-title":"Cryptococcus gattii in the United States: clinical aspects of infection with an emerging pathogen","volume":"53","author":"Harris","year":"2011","journal-title":"Clin Infect Dis"},{"key":"2022020121022594000_DKU554C2","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1080\/mmy.39.2.155.168","article-title":"Cryptococcus neoformans variety gattii","volume":"39","author":"Sorrell","year":"2001","journal-title":"Med 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