title: Molecular characterization of a novel isolate of Candida tropicalis for enhanced lipid production.
abstract: OBJECTIVE
  To characterize a new isolate of Candida tropicalis for its enhanced storage lipid accumulation with respect to lipid composition, fatty acid profile and transcriptional regulation of four key genes involved in lipid productivity using different carbon sources.
  
  
  RESULTS
  Upon growing C. tropicalis on various carbon substrates, glucose was found to be the best followed by xylose for the production of both biomass and storage lipid. On glucose (100 g l(-1)) medium having specific nitrogen stress (C:N 150 : 1), the yeast was capable of yielding about 58% lipid content of its dry biomass, and neutral lipid accounted for about 75% of the total lipid. Fatty acid profiles revealed that the glucose contributed to the highest yield of total fatty acids, maximum proportion of saturated fatty acids and a significant amount of oleic acid. The enhanced lipid production with specific fatty acid profile correlated with the strong upregulation of acetyl Co-A carboxylase, stearoyl-ACP desaturase and diacylglycerol acyltransferase genes, but not the malic enzyme gene.
  
  
  CONCLUSIONS
  Together, the results documented the differential regulation of four genes of lipid biosynthesis in the newly isolated C. tropicalis oleaginous strain by various carbon sources.
  
  
  CONCLUSIONS
  We report here on optimization of the carbon substrate for improved lipid yield and transcriptional regulation of lipid biosynthetic genes in C. tropicalis. Our study paves the way for further enhancement of lipid production by metabolic engineering in this organism, which has potential to be the lipid feedstock as a cocoa-butter substitute.
authors: Advanced Laboratory for Plant Genetic Engineering, Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, Kharagpur, India.
authors: P
authors: P
authors: Dey
authors: M K
authors: MK
authors: Maiti
mesh_terms: D000103:Acetyl-CoA Carboxylase / Q000235:genetics; D018533:Biomass; D041022:Candida tropicalis / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism*; D003470:Culture Media / Q000737:chemistry; D051048:Diacylglycerol O-Acyltransferase / Q000235:genetics; D005227:Fatty Acids / Q000096:biosynthesis; D015966:Gene Expression Regulation, Fungal; D005947:Glucose / Q000378:metabolism; D007218:Industrial Microbiology; D008055:Lipids / Q000096:biosynthesis*; D008291:Malate Dehydrogenase / Q000235:genetics; D006899:Mixed Function Oxygenases / Q000235:genetics; D009584:Nitrogen / Q000378:metabolism; D019301:Oleic Acid / Q000096:biosynthesis; D012335:RNA, Ribosomal / Q000235:genetics; D012988:Soil Microbiology; D059467:Transcriptome; D014994:Xylose / Q000378:metabolism
chemical_list: D003470:Culture Media; D005227:Fatty Acids; D008055:Lipids; D012335:RNA, Ribosomal; C065096:RNA, ribosomal, 26S; D019301:Oleic Acid; D002244:Carbon; D014994:Xylose; D006899:Mixed Function Oxygenases; D008291:Malate Dehydrogenase; C018747:acyl-(acyl-carrier-protein)desaturase; D051048:Diacylglycerol O-Acyltransferase; D000103:Acetyl-CoA Carboxylase; D005947:Glucose; D009584:Nitrogen