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Cysteine Proteases definition: A subclass of peptide hydrolases that depend on a CYSTEINE residue for their activity.
Cysteine Proteinase definition: An enzyme that contains an unpaired cysteine in the active site which acts as a nucleophilic thiol to catalyze the proteolytic processing of other proteins or polypeptides.
 
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In this paper we review the current status of cysteine proteinases from fruits and protective plant latices as novel anthelmintics, we consider some of the problems inherent in taking laboratory findings and those derived from folk-medicine to the market and we suggest that there is a wealth of new compounds still to be discovered that could be harvested to benefit humans and livestock.

Jerzy M Behnke et al.

Parasites & Vectors 1 (7), 01 Sep 2008

Medicinal fruits containing cysteine proteinases Some of the earliest known medicinal anthelmintic plants include papaya ( Carica papaya ), figs ( Ficus spp.) and pineapple ( Ananas comosus ).

Jerzy M Behnke et al.

Parasites & Vectors 1 (7), 01 Sep 2008

The active principles are now known to be cysteine proteinases (CP) that occur naturally in various parts of the plant, and Table 1 summarises some of those known to be contained within plants.

Jerzy M Behnke et al.

Parasites & Vectors 1 (7), 01 Sep 2008

Plants which are known to contain cysteine proteinases with potential anthelmintic activity

Jerzy M Behnke et al.

Parasites & Vectors 1 (7), 01 Sep 2008

Molecular characteristics of cysteine proteinases and their target proteins The CPs are phylogenetically classified into 9 clans which show no evolutionary relationship between them, suggesting that the ability to utilise the thiolate anion of a cysteine residue as the nucleophile in peptide bond hydrolysis may have arisen independently on nine occasions.

Jerzy M Behnke et al.

Parasites & Vectors 1 (7), 01 Sep 2008

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