title: [Sortase analysis by displaying its substrates on yeast surface].
abstract: OBJECTIVE
  QALPETGEE sortase's substrate was anchored on the cell surface of yeast Pichia pastoris using EGFP to detect its expression.
  
  
  METHODS
  The gene-encoding QALPETGEE-linker-EGFP was amplified by PCR by using pcDNA/myc-his-EGFP as a template, and then inserted into shuttle vector pKFS. Then, the vectors were introduced into Pichia pastoris GS115. After cultivation, recombinant cells were verified with fluorescence microscopy and sortase activity was detected by fluorescence spectrophotometer from variety of free EGFP's fluorescence intensity.
  
  
  RESULTS
  The green cells were observed by fluorescence microscopy, enhancing over time. Fluorescence spectrophotometer convinced that fluorescence intensity of free EGFP in the reaction supernatant increased from 187.67 +/- 2.16 to 273.47 +/- 2.14 after interaction of sortase and its substrates.
  
  
  CONCLUSIONS
  The result suggests that sortase's substrates have been displayed on yeast successfully, which could be used for sortase activity assay.
authors.affiliation: College of Veterinary Medicine, National Reference Laboratory of Veterinary Drug Residues, Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou 510642, China. btlxluo@scut.edu.cn
authors.forename: Lixin
authors.initials: L
authors.lastname: Luo
authors.forename: Lin
authors.initials: L
authors.lastname: Wu
authors.forename: Ying
authors.initials: Y
authors.lastname: Lin
mesh_terms: D003546:Cysteine Endopeptidases / Q000235:genetics / Q000378:metabolism*; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D005822:Genetic Vectors / Q000235:genetics / Q000378:metabolism; D010843:Pichia / Q000201:enzymology* / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D005656:Fungal Proteins; D011993:Recombinant Fusion Proteins; D003546:Cysteine Endopeptidases