African Journal of

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12484

Full Length Research Paper

Purification of acidic protease from the cotyledons of germinating Indian bean (Dolichos lablab L. var lignosus) seeds

Vadde Ramakrishna* and P. Ramakrishna Rao
Department of Biochemistry, Sri Krishnadevaraya University, Anantapur – 515 003. A.P., India.
Email: [email protected]; [email protected]

  •  Accepted: 25 March 2005
  •  Published: 31 July 2005



The positive correlation between the developments of acid, neutral and alkaline proteases (azocaseinolytic) with protein depletion suggest the involvement of these proteases in the degradation of proteins in germinating Indian bean.  These proteases increased in the early stages of germination and decreased later. However, the activity of acid proteases was higher throughout the germination period compared with the activities of neutral and alkaline proteases.   The acid protease from the cotyledons of 4-day old germinating Indian bean seedlings was purified to 152 folds by a five step procedure comprising - crude extract from cotyledons, (NH4)2SO4 fractionation, DEAE-cellulose, CM-cellulose and finally casein-agarose affinity chromatography. The molecular mass of acidic protease is 32 kDa.


Key words: Dolichos lablab, proteolytic enzymes, acidic protease, purification, protein mobilization, germination.