Coefficiente di estinzione: E1% = 21,0 (280 nm) pI: 9,0
Azioni biochim/fisiol
La ficina è classificata come proteasi tiolica. Contiene una singola cisteina reattiva nel sito attivo. L′omologia degli amminoacidi del sito attivo è simile a quella della papaina. La ficina scinde le proteine in corrispondenza del lato carbossilico di Gly, Ser, Thr, Met, Lys, Arg, Tyr, Ala, Asn e Val. La Km del substrato cromogenico pGlu-Phe-Leu-p-nitroanilina è di 0,43 mM. La ficina è inibita da: iodoacetamide, acido iodoacetico, N-etilmaleimide, cloruro mercurico, DFP (diisopropil fluorofosfato), TLCK (Na-p-Tosil-lisina clorometil chetone) e TPCK (N-Tosil-L-fenilalanina clorometil chetone). La ficina può essere utilizzata per generare frammenti F (ab′)2 ad alta resa a partire dalla IgG1 di topo.
Definizione di unità
L′enzima è solubile in 1 M di tampone di fosfato di potassio, pH 7,0 (0,25 mg/ml), e produce una soluzione trasparente.
Un′unità produce un ΔA280 di 1,0 per minuto a pH 7,0 e 37 °C, misurato come prodotti solubili in TCA dalla caseina in un volume finale di 10 ml (percorso luminoso di 1 cm).
Ficin is classified as a sulfhydryl protease isolated from the latex of fig trees. In most cases, a particular enzyme fits a few types of substrate and catalyzes one type of reaction. In this investigation, we found sufficient proofs for
Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology, 141(1), 103-109 (2005-04-12)
A novel cysteine protease inhibitor (Eel-CPI-1) was isolated from the epidermis of the eel. Eel-CPI-1 was shown to bind strongly to both lactose- and carboxymethylated papain-affinity gels. Its molecular mass under reducing condition was determined to be 18 kDa by
The capability of ficin, a cystine protease, to form peptide bonds was investigated using several types of N-Boc-amino acid phenyl and naphthyl esters as acyl donor components. Enzyme-catalyzed peptide synthesis was carried out under optimized reaction conditions of pH, acyl
Archives of biochemistry and biophysics, 352(2), 199-206 (1998-05-20)
Two variants of cystatin SA encoded by two alleles at the CST2 locus of the type 2 human cystatin gene family were expressed in Escherichia coli. One, termed cystatin SA1, is identical to cystatin SA [S. Isemura, E. Saitoh, and
Journal of immunological methods, 312(1-2), 167-181 (2006-05-06)
The sensitivity of immunosensors is strongly dependent on the amount of immobilised antibodies and their remaining antigen binding properties. The use of smaller and well-oriented antibody fragments as bioreceptor molecules influences the final immunosensor signal. The aim of this study
This procedure may be used for all Ficin products.
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