Purification and characterization of a beta-glucosidase from Citrus sinensis var. Valencia fruit tissue.
Identifieur interne : 000035 ( Ncbi/Checkpoint ); précédent : 000034; suivant : 000036Purification and characterization of a beta-glucosidase from Citrus sinensis var. Valencia fruit tissue.
Auteurs : R G Cameron [États-Unis] ; J A Manthey ; R A Baker ; K. GrohmannSource :
- Journal of agricultural and food chemistry [ 0021-8561 ] ; 2001.
English descriptors
- KwdEn :
- MESH :
- chemical , isolation & purification : beta-Glucosidase.
- enzymology : Citrus.
- chemical , metabolism : beta-Glucosidase.
- Chromatography, Gel, Hydrogen-Ion Concentration, Hydrolysis, Kinetics, Molecular Weight, Temperature.
Abstract
A preliminary survey demonstrated activity for alpha-D-glucosidase, alpha-D-mannosidase, alpha-L-arabinosidase, beta-D-glucosidase, beta-D-xylosidase, and beta-D-galactosidase in orange fruit flavedo and albedo tissue. alpha-L-Rhamnosidase was not detected. Subsequently, a beta-glucosidase was purified from mature fruit rag tissue (composed of intersegmental septa, squeezed juice sacs, and fruit core tissue) of Citrus sinensis var. Valencia. The beta-glucosidase exhibited low levels of activity against p-nitrophenyl-beta-D-fucopyranoside (13.5%) and p-nitrophenyl-alpha-D-glucopyranoside (7.0%), compared to its activity against p-nitrophenyl-beta-D-glucopyranoside (pNPG, 100%). The enzyme was purified by a combination of ion exchange (anion and cation) and gel filtration (Superdex and Toyopearl HW-55S) chromatography. It has an apparent molecular mass of 64 kDa by denaturing electrophoresis or 55 kDa by gel filtration chromatography (BioGel P-100). Hydrolysis of pNPG demonstrated a pH optimum between 4.5 and 5.5. At pH 5.0 the temperature optimum was 40 degrees C. At pH 5.0 and 40 degrees C the K(m) for pNPG was 0.1146 mM and it had a V(max) of 5.2792 nkatal x mg(-1) protein (katal = 0.06 International Units = the amount of enzyme that produces, under standard conditions, one micromol of product per min). Of the substrates tested, the enzyme was most active against the disaccharide cellobiose (1-->4), but was not active against p-nitrophenyl-beta-D-cellobioside. High levels of activity also were observed with the disaccharides laminaribiose (1-->3), gentiobiose (1-->6), and sophorose (1-->2). Activity greater than that observed with pNPG was obtained with the flavonoids hesperetin-7-glucoside and prunin (naringenin-7-glucoside), salicin, mandelonitrile-beta-D-glucoside (a cyanogenic substrate), and sinigrin (a glucosinolate). The enzyme was not active against amygdalin, coniferin, or limonin glucoside.
PubMed: 11559154
Affiliations:
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pubmed:11559154Le document en format XML
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<author><name sortKey="Cameron, R G" sort="Cameron, R G" uniqKey="Cameron R" first="R G" last="Cameron">R G Cameron</name>
<affiliation wicri:level="1"><nlm:affiliation>Citrus and Subtropical Products Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 600 Avenue S, NW, Winter Haven, Florida 33881, USA. rcameron@citrus.usda.gov</nlm:affiliation>
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Citrus and Subtropical Products Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 600 Avenue S, NW, Winter Haven, Florida 33881</wicri:regionArea>
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<author><name sortKey="Manthey, J A" sort="Manthey, J A" uniqKey="Manthey J" first="J A" last="Manthey">J A Manthey</name>
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<author><name sortKey="Baker, R A" sort="Baker, R A" uniqKey="Baker R" first="R A" last="Baker">R A Baker</name>
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<author><name sortKey="Grohmann, K" sort="Grohmann, K" uniqKey="Grohmann K" first="K" last="Grohmann">K. Grohmann</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Purification and characterization of a beta-glucosidase from Citrus sinensis var. Valencia fruit tissue.</title>
<author><name sortKey="Cameron, R G" sort="Cameron, R G" uniqKey="Cameron R" first="R G" last="Cameron">R G Cameron</name>
<affiliation wicri:level="1"><nlm:affiliation>Citrus and Subtropical Products Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 600 Avenue S, NW, Winter Haven, Florida 33881, USA. rcameron@citrus.usda.gov</nlm:affiliation>
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<author><name sortKey="Manthey, J A" sort="Manthey, J A" uniqKey="Manthey J" first="J A" last="Manthey">J A Manthey</name>
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<author><name sortKey="Baker, R A" sort="Baker, R A" uniqKey="Baker R" first="R A" last="Baker">R A Baker</name>
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<series><title level="j">Journal of agricultural and food chemistry</title>
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<term>Hydrogen-Ion Concentration</term>
<term>Hydrolysis</term>
<term>Kinetics</term>
<term>Molecular Weight</term>
<term>Temperature</term>
<term>beta-Glucosidase (isolation & purification)</term>
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<front><div type="abstract" xml:lang="en">A preliminary survey demonstrated activity for alpha-D-glucosidase, alpha-D-mannosidase, alpha-L-arabinosidase, beta-D-glucosidase, beta-D-xylosidase, and beta-D-galactosidase in orange fruit flavedo and albedo tissue. alpha-L-Rhamnosidase was not detected. Subsequently, a beta-glucosidase was purified from mature fruit rag tissue (composed of intersegmental septa, squeezed juice sacs, and fruit core tissue) of Citrus sinensis var. Valencia. The beta-glucosidase exhibited low levels of activity against p-nitrophenyl-beta-D-fucopyranoside (13.5%) and p-nitrophenyl-alpha-D-glucopyranoside (7.0%), compared to its activity against p-nitrophenyl-beta-D-glucopyranoside (pNPG, 100%). The enzyme was purified by a combination of ion exchange (anion and cation) and gel filtration (Superdex and Toyopearl HW-55S) chromatography. It has an apparent molecular mass of 64 kDa by denaturing electrophoresis or 55 kDa by gel filtration chromatography (BioGel P-100). Hydrolysis of pNPG demonstrated a pH optimum between 4.5 and 5.5. At pH 5.0 the temperature optimum was 40 degrees C. At pH 5.0 and 40 degrees C the K(m) for pNPG was 0.1146 mM and it had a V(max) of 5.2792 nkatal x mg(-1) protein (katal = 0.06 International Units = the amount of enzyme that produces, under standard conditions, one micromol of product per min). Of the substrates tested, the enzyme was most active against the disaccharide cellobiose (1-->4), but was not active against p-nitrophenyl-beta-D-cellobioside. High levels of activity also were observed with the disaccharides laminaribiose (1-->3), gentiobiose (1-->6), and sophorose (1-->2). Activity greater than that observed with pNPG was obtained with the flavonoids hesperetin-7-glucoside and prunin (naringenin-7-glucoside), salicin, mandelonitrile-beta-D-glucoside (a cyanogenic substrate), and sinigrin (a glucosinolate). The enzyme was not active against amygdalin, coniferin, or limonin glucoside.</div>
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<name sortKey="Manthey, J A" sort="Manthey, J A" uniqKey="Manthey J" first="J A" last="Manthey">J A Manthey</name>
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<country name="États-Unis"><noRegion><name sortKey="Cameron, R G" sort="Cameron, R G" uniqKey="Cameron R" first="R G" last="Cameron">R G Cameron</name>
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