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001-es BibID:	BIBFORM052821
035-os BibID:	(WoS)A1993KY72300008
Első szerző:	Pócsi István (vegyész)
Cím:	Comparison of several new chromogenic galactosides as substrates for various [beta]-D-galactosidases. / I. Pócsi, S. A. Taylor, A. C. Richardson, B. V. Smith, R. G. Price
Dátum:	1993
ISSN:	0167-4838
Megjegyzések:	The kinetic characteristics of β-galactosidases from bovine liver and testes, Escherichia coli, Aspergillus niger and Jack bean were studied using five newly-developed colorimetric substrates. All the chromophores released by enzyme hydrolysis had high extinction coefficients in the visible region of the spectrum. Varying amounts of substrate inhibition were found with each of these substrates (VBzTM-Gal, VLM-Gal, VLPr-Gal, VQM-Gal and VQPr-Gal), but this was not a significant problem if the correct assay conditions were used. The substrates attached particularly tightly to the active centre of E. coli β-d-galactosidase resulting in low values. The data suggest that the chemical properties of the heterocyclic portion of the aglycone distant from the glycosidic oxygen do not affect the substrate specificity and the substrate inhibition can be attributed interactions not involving the catalytic site. When the product of the maximum observed velocity (vm) and the molar absorption coefficient is calculated for each substrate, the relative merits of the substrates for the assay of each enzyme can be assessed. The β-d-galactosidases from fungal and bacterial sources hydrolysed the substrates most efficiently, indicating that they may be of particular value in areas of molecular biology and biotechnology.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Chromogenic substrate β-d-Galactosidase E. coli A. niger Bovine Jack bean
Megjelenés:	Biochimica et Biophysica Acta (BBA). Protein Structure and Molecular Enzymology. - 1163 : 1 (1993), p. 54-60. -
További szerzők:	Taylor, Sarah A. Richardson, A. C. Smith, B. V. Price, Robert G.
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI Szerző által megadott URL
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