Author/Editor | Dolenc, Iztok; Turk, Boris; Kos, Janko; Turk, Vito | |
Title | Interaction of human cathepsin C with chicken cystatin | |
Type | članek | |
Source | FEBS Lett | |
Vol. and No. | Letnik 392, št. 3 | |
Publication year | 1996 | |
Volume | str. 277-80 | |
Language | eng | |
Abstract | Cathepsin C was purified from human spleen by a rapid procedure, which included homogenization, ammonium sulfate precipitation, gel filtration on Sephracryl S-200 and finally affinity chromatography on chicken cystatin-Sepharose. The interaction between cathepsin C and chicken cystatin was further characterized. It was found to be accompanied by a maximum decrease in fluorescence emission intensity at 336 nm. Fluorescence titration showed that human cathepsin C can bind four chicken cystatin molecules. The 4:1 binding stoichiometry was confirmed by titration monitored by the loss of enzyme activity. A non-competitive-competitive type of inhibition was determined from a double-reciprocal Lineweaver-Burk plot with a Ki value of 0.22 nM for the non-competitive inhibition. | |
Descriptors | CHROMATOGRAPHY, AFFINITY CYSTATINS DIPEPTIDYL PEPTIDASES CHICKENS SPECTROMETRY, FLUORESCENCE TITRIMETRY |