Purified cauliflower (Brassica oleracea var. botrytis) mitochondrial proteins fractionated into soluble, membrane, integral membrane and peripheral membrane samples were analyzed by 2D- PAGE (isoelectric focusing/ SDS polyacrylamide gel electrophoresis). 2D gels patterns were compared using the Imager Master 2D Elite software. 561 silver stained protein spots were resolved after electrophoresis under standard conditions of a whole protein extract. In the soluble fraction a prevalent number of more intense protein spots was observed. The cauliflower protein 2D patterns resembled Arabidopsis thaliana 2D patterns. The two protein spots selected which occupied a similar isoelectric point positions on both gels represented the same proteins as revealed by ESI-MS analysis of cauliflower proteins. The third selected spot belongs to unidentified proteins. The comparative analysis of mitochondrial suborganellar fractions proved the usefulness of this approach.
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