Expression library screen by prenylation of expressed proteins

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving transferase

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435 71, 435 772, 435 6, C12Q 148, C12Q 168, G01N 3358

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059324325

ABSTRACT:
Described is a novel in vitro method for obtaining and identifying proteins which, in their natural in vivo setting, are covalently modified after translation. To identify novel isoprenylated proteins for subsequent biochemical study, colony blots of a Glycine max cDNA expression library screen contained several different carboxy-termini that conform to consensus farnesylation motifs. These proteins included known farnesylated proteins (DnaJ homologs) and several novel proteins, two of which contained 6 or more tandem repeats of a hexapeptide having the consensus direct labeling can thus be adapted to recover and identify isoprenylated proteins as well as proteins with other post-translational modifications. This identification and recovery further enables the recovery of transformants containing DNA encoding the proteins, as well as the raising of antibodies to the proteins.

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