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Separation and characterization of a salt-dependent pectin methylesterase from Citrus sinensis Var. valencia fruit tissue

Identifieur interne : 000755 ( PascalFrancis/Corpus ); précédent : 000754; suivant : 000756

Separation and characterization of a salt-dependent pectin methylesterase from Citrus sinensis Var. valencia fruit tissue

Auteurs : Randall G. Cameron ; Brett J. Savary ; Arland T. Hotchkiss ; Marshall L. Fishman ; H. O. A. K. Chau ; Robert A. Baker ; Karel Grohmann

Source :

RBID : Pascal:03-0344968

Descripteurs français

English descriptors

Abstract

A pectin methylesterase (PME) from sweet orange fruit rag tissue, which does not destabilize citrus juice cloud, has been characterized. It is a salt-dependent PME (type II) and exhibits optimal activity between 0.1 and 0.2 M NaCI at pH 7.5. The pH optimum shifted to a more alkaline range as the salt molarity decreased (pH 8.5-9.5 at 50 mM NaCI). It has an apparent molecular mass of 32.4 kDa as determined by gel filtration chromatography, an apparent molecular mass of 33.5 kDa as determined by denaturing electrophoresis, and a pl of 10.1 and exhibits a single activity band after isoelectric focusing (IEF). It has a Km of 0.0487 mg/mL and a Vmax of 4.2378 nkat/mg of protein on 59% DE citrus pectin. Deblocking the N-terminus revealed a partial peptide composed of SVTPNV. Deesterification of non-calcium-sensitive pectin by 6.5% increased the calcium-sensitive pectin ratio (CSPR) from 0. 045 ± 0.011 to 0. 829 ± 0.033 but had little, if any, effect on pectin molecular weight. These properties indicate this enzyme will be useful for studying the PME mode of action as it relates to juice cloud destabilization.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A02 01      @0 JAFCAU
A03   1    @0 J. agric. food chem. : (Print)
A05       @2 51
A06       @2 7
A08 01  1  ENG  @1 Separation and characterization of a salt-dependent pectin methylesterase from Citrus sinensis Var. valencia fruit tissue
A11 01  1    @1 CAMERON (Randall G.)
A11 02  1    @1 SAVARY (Brett J.)
A11 03  1    @1 HOTCHKISS (Arland T.)
A11 04  1    @1 FISHMAN (Marshall L.)
A11 05  1    @1 CHAU (H. O. A. K.)
A11 06  1    @1 BAKER (Robert A.)
A11 07  1    @1 GROHMANN (Karel)
A14 01      @1 Citrus and Subtropical Products Laboratory, South Atlantic Area, Agricultural Research Service, U.S. Department of Agriculture, 600 Avenue South N.W. @2 Winter Haven, Florida 33881 @3 USA @Z 1 aut.
A14 02      @1 Eastern Regional Research Center, North Atlantic Area, Agricultural Research Service, U.S. Department of Agriculture, 600 Mermaid Lane @2 Wyndmoor, Pennsylvania 19038 @3 USA @Z 2 aut. @Z 3 aut. @Z 4 aut. @Z 5 aut.
A20       @1 2070-2075
A21       @1 2003
A23 01      @0 ENG
A43 01      @1 INIST @2 7332 @5 354000109555090500
A44       @0 0000 @1 © 2003 INIST-CNRS. All rights reserved.
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A47 01  1    @0 03-0344968
A60       @1 P
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A66 01      @0 USA
C01 01    ENG  @0 A pectin methylesterase (PME) from sweet orange fruit rag tissue, which does not destabilize citrus juice cloud, has been characterized. It is a salt-dependent PME (type II) and exhibits optimal activity between 0.1 and 0.2 M NaCI at pH 7.5. The pH optimum shifted to a more alkaline range as the salt molarity decreased (pH 8.5-9.5 at 50 mM NaCI). It has an apparent molecular mass of 32.4 kDa as determined by gel filtration chromatography, an apparent molecular mass of 33.5 kDa as determined by denaturing electrophoresis, and a pl of 10.1 and exhibits a single activity band after isoelectric focusing (IEF). It has a Km of 0.0487 mg/mL and a Vmax of 4.2378 nkat/mg of protein on 59% DE citrus pectin. Deblocking the N-terminus revealed a partial peptide composed of SVTPNV. Deesterification of non-calcium-sensitive pectin by 6.5% increased the calcium-sensitive pectin ratio (CSPR) from 0. 045 ± 0.011 to 0. 829 ± 0.033 but had little, if any, effect on pectin molecular weight. These properties indicate this enzyme will be useful for studying the PME mode of action as it relates to juice cloud destabilization.
C02 01  X    @0 002A35B09
C03 01  X  FRE  @0 Caractérisation @5 01
C03 01  X  ENG  @0 Characterization @5 01
C03 01  X  SPA  @0 Caracterización @5 01
C03 02  X  FRE  @0 Séparation @5 02
C03 02  X  ENG  @0 Separation @5 02
C03 02  X  SPA  @0 Separación @5 02
C03 03  X  FRE  @0 Pectinesterase @2 FE @5 10
C03 03  X  ENG  @0 Pectinesterase @2 FE @5 10
C03 03  X  SPA  @0 Pectinesterase @2 FE @5 10
C03 04  X  FRE  @0 Sensibilité résistance @5 19
C03 04  X  ENG  @0 Sensitivity resistance @5 19
C03 04  X  SPA  @0 Sensibilidad resistencia @5 19
C03 05  X  FRE  @0 Activité enzymatique @5 20
C03 05  X  ENG  @0 Enzymatic activity @5 20
C03 05  X  SPA  @0 Actividad enzimática @5 20
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C03 06  X  ENG  @0 Citrus sinensis @2 NS @5 24
C03 06  X  SPA  @0 Citrus sinensis @2 NS @5 24
C03 07  X  FRE  @0 Sel @5 26
C03 07  X  ENG  @0 Salt @5 26
C03 07  X  SPA  @0 Sal @5 26
C03 08  X  FRE  @0 Galacturonique acide @2 NK @5 28
C03 08  X  ENG  @0 Galacturonic acid @2 NK @5 28
C03 08  X  SPA  @0 Galacturónico ácido @2 NK @5 28
C03 09  X  FRE  @0 Pectine @5 29
C03 09  X  ENG  @0 Pectin @5 29
C03 09  X  SPA  @0 Pectina @5 29
C07 01  X  FRE  @0 Carboxylic ester hydrolases @2 FE
C07 01  X  ENG  @0 Carboxylic ester hydrolases @2 FE
C07 01  X  SPA  @0 Carboxylic ester hydrolases @2 FE
C07 02  X  FRE  @0 Esterases @2 FE
C07 02  X  ENG  @0 Esterases @2 FE
C07 02  X  SPA  @0 Esterases @2 FE
C07 03  X  FRE  @0 Hydrolases @2 FE
C07 03  X  ENG  @0 Hydrolases @2 FE
C07 03  X  SPA  @0 Hydrolases @2 FE
C07 04  X  FRE  @0 Enzyme
C07 04  X  ENG  @0 Enzyme
C07 04  X  SPA  @0 Enzima
C07 05  X  FRE  @0 Rutaceae @2 NS
C07 05  X  ENG  @0 Rutaceae @2 NS
C07 05  X  SPA  @0 Rutaceae @2 NS
C07 06  X  FRE  @0 Dicotyledones @2 NS
C07 06  X  ENG  @0 Dicotyledones @2 NS
C07 06  X  SPA  @0 Dicotyledones @2 NS
C07 07  X  FRE  @0 Angiospermae @2 NS
C07 07  X  ENG  @0 Angiospermae @2 NS
C07 07  X  SPA  @0 Angiospermae @2 NS
C07 08  X  FRE  @0 Spermatophyta @2 NS
C07 08  X  ENG  @0 Spermatophyta @2 NS
C07 08  X  SPA  @0 Spermatophyta @2 NS
C07 09  X  FRE  @0 Agrume @5 32
C07 09  X  ENG  @0 Citrus fruit @5 32
C07 09  X  SPA  @0 Agrios @5 32
C07 10  X  FRE  @0 Fruit @5 33
C07 10  X  ENG  @0 Fruit @5 33
C07 10  X  SPA  @0 Fruto @5 33
C07 11  X  FRE  @0 Polyoside @2 NK @5 34
C07 11  X  ENG  @0 Polysaccharide @2 NK @5 34
C07 11  X  SPA  @0 Poliósido @2 NK @5 34
C07 12  X  FRE  @0 Biopolymère @5 54
C07 12  X  ENG  @0 Biopolymer @5 54
C07 12  X  SPA  @0 Biopolímero @5 54
N21       @1 246
N82       @1 PSI

Format Inist (serveur)

NO : PASCAL 03-0344968 INIST
ET : Separation and characterization of a salt-dependent pectin methylesterase from Citrus sinensis Var. valencia fruit tissue
AU : CAMERON (Randall G.); SAVARY (Brett J.); HOTCHKISS (Arland T.); FISHMAN (Marshall L.); CHAU (H. O. A. K.); BAKER (Robert A.); GROHMANN (Karel)
AF : Citrus and Subtropical Products Laboratory, South Atlantic Area, Agricultural Research Service, U.S. Department of Agriculture, 600 Avenue South N.W./Winter Haven, Florida 33881/Etats-Unis (1 aut.); Eastern Regional Research Center, North Atlantic Area, Agricultural Research Service, U.S. Department of Agriculture, 600 Mermaid Lane/Wyndmoor, Pennsylvania 19038/Etats-Unis (2 aut., 3 aut., 4 aut., 5 aut.)
DT : Publication en série; Niveau analytique
SO : Journal of agricultural and food chemistry : (Print); ISSN 0021-8561; Coden JAFCAU; Etats-Unis; Da. 2003; Vol. 51; No. 7; Pp. 2070-2075; Bibl. 39 ref.
LA : Anglais
EA : A pectin methylesterase (PME) from sweet orange fruit rag tissue, which does not destabilize citrus juice cloud, has been characterized. It is a salt-dependent PME (type II) and exhibits optimal activity between 0.1 and 0.2 M NaCI at pH 7.5. The pH optimum shifted to a more alkaline range as the salt molarity decreased (pH 8.5-9.5 at 50 mM NaCI). It has an apparent molecular mass of 32.4 kDa as determined by gel filtration chromatography, an apparent molecular mass of 33.5 kDa as determined by denaturing electrophoresis, and a pl of 10.1 and exhibits a single activity band after isoelectric focusing (IEF). It has a Km of 0.0487 mg/mL and a Vmax of 4.2378 nkat/mg of protein on 59% DE citrus pectin. Deblocking the N-terminus revealed a partial peptide composed of SVTPNV. Deesterification of non-calcium-sensitive pectin by 6.5% increased the calcium-sensitive pectin ratio (CSPR) from 0. 045 ± 0.011 to 0. 829 ± 0.033 but had little, if any, effect on pectin molecular weight. These properties indicate this enzyme will be useful for studying the PME mode of action as it relates to juice cloud destabilization.
CC : 002A35B09
FD : Caractérisation; Séparation; Pectinesterase; Sensibilité résistance; Activité enzymatique; Citrus sinensis; Sel; Galacturonique acide; Pectine
FG : Carboxylic ester hydrolases; Esterases; Hydrolases; Enzyme; Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Agrume; Fruit; Polyoside; Biopolymère
ED : Characterization; Separation; Pectinesterase; Sensitivity resistance; Enzymatic activity; Citrus sinensis; Salt; Galacturonic acid; Pectin
EG : Carboxylic ester hydrolases; Esterases; Hydrolases; Enzyme; Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Citrus fruit; Fruit; Polysaccharide; Biopolymer
SD : Caracterización; Separación; Pectinesterase; Sensibilidad resistencia; Actividad enzimática; Citrus sinensis; Sal; Galacturónico ácido; Pectina
LO : INIST-7332.354000109555090500
ID : 03-0344968

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Pascal:03-0344968

Le document en format XML

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<div type="abstract" xml:lang="en">A pectin methylesterase (PME) from sweet orange fruit rag tissue, which does not destabilize citrus juice cloud, has been characterized. It is a salt-dependent PME (type II) and exhibits optimal activity between 0.1 and 0.2 M NaCI at pH 7.5. The pH optimum shifted to a more alkaline range as the salt molarity decreased (pH 8.5-9.5 at 50 mM NaCI). It has an apparent molecular mass of 32.4 kDa as determined by gel filtration chromatography, an apparent molecular mass of 33.5 kDa as determined by denaturing electrophoresis, and a pl of 10.1 and exhibits a single activity band after isoelectric focusing (IEF). It has a K
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of 4.2378 nkat/mg of protein on 59% DE citrus pectin. Deblocking the N-terminus revealed a partial peptide composed of SVTPNV. Deesterification of non-calcium-sensitive pectin by 6.5% increased the calcium-sensitive pectin ratio (CSPR) from 0. 045 ± 0.011 to 0. 829 ± 0.033 but had little, if any, effect on pectin molecular weight. These properties indicate this enzyme will be useful for studying the PME mode of action as it relates to juice cloud destabilization.</div>
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<fA44>
<s0>0000</s0>
<s1>© 2003 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45>
<s0>39 ref.</s0>
</fA45>
<fA47 i1="01" i2="1">
<s0>03-0344968</s0>
</fA47>
<fA60>
<s1>P</s1>
</fA60>
<fA61>
<s0>A</s0>
</fA61>
<fA64 i1="01" i2="1">
<s0>Journal of agricultural and food chemistry : (Print)</s0>
</fA64>
<fA66 i1="01">
<s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG">
<s0>A pectin methylesterase (PME) from sweet orange fruit rag tissue, which does not destabilize citrus juice cloud, has been characterized. It is a salt-dependent PME (type II) and exhibits optimal activity between 0.1 and 0.2 M NaCI at pH 7.5. The pH optimum shifted to a more alkaline range as the salt molarity decreased (pH 8.5-9.5 at 50 mM NaCI). It has an apparent molecular mass of 32.4 kDa as determined by gel filtration chromatography, an apparent molecular mass of 33.5 kDa as determined by denaturing electrophoresis, and a pl of 10.1 and exhibits a single activity band after isoelectric focusing (IEF). It has a K
<sub>m</sub>
of 0.0487 mg/mL and a V
<sub>max</sub>
of 4.2378 nkat/mg of protein on 59% DE citrus pectin. Deblocking the N-terminus revealed a partial peptide composed of SVTPNV. Deesterification of non-calcium-sensitive pectin by 6.5% increased the calcium-sensitive pectin ratio (CSPR) from 0. 045 ± 0.011 to 0. 829 ± 0.033 but had little, if any, effect on pectin molecular weight. These properties indicate this enzyme will be useful for studying the PME mode of action as it relates to juice cloud destabilization.</s0>
</fC01>
<fC02 i1="01" i2="X">
<s0>002A35B09</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE">
<s0>Caractérisation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>Characterization</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>Caracterización</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE">
<s0>Séparation</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG">
<s0>Separation</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA">
<s0>Separación</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Pectinesterase</s0>
<s2>FE</s2>
<s5>10</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Pectinesterase</s0>
<s2>FE</s2>
<s5>10</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Pectinesterase</s0>
<s2>FE</s2>
<s5>10</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Sensibilité résistance</s0>
<s5>19</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Sensitivity resistance</s0>
<s5>19</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Sensibilidad resistencia</s0>
<s5>19</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Activité enzymatique</s0>
<s5>20</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Enzymatic activity</s0>
<s5>20</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA">
<s0>Actividad enzimática</s0>
<s5>20</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>24</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>24</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>24</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE">
<s0>Sel</s0>
<s5>26</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG">
<s0>Salt</s0>
<s5>26</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA">
<s0>Sal</s0>
<s5>26</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE">
<s0>Galacturonique acide</s0>
<s2>NK</s2>
<s5>28</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG">
<s0>Galacturonic acid</s0>
<s2>NK</s2>
<s5>28</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA">
<s0>Galacturónico ácido</s0>
<s2>NK</s2>
<s5>28</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE">
<s0>Pectine</s0>
<s5>29</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG">
<s0>Pectin</s0>
<s5>29</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA">
<s0>Pectina</s0>
<s5>29</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE">
<s0>Carboxylic ester hydrolases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG">
<s0>Carboxylic ester hydrolases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA">
<s0>Carboxylic ester hydrolases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE">
<s0>Esterases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG">
<s0>Esterases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA">
<s0>Esterases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE">
<s0>Hydrolases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG">
<s0>Hydrolases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA">
<s0>Hydrolases</s0>
<s2>FE</s2>
</fC07>
<fC07 i1="04" i2="X" l="FRE">
<s0>Enzyme</s0>
</fC07>
<fC07 i1="04" i2="X" l="ENG">
<s0>Enzyme</s0>
</fC07>
<fC07 i1="04" i2="X" l="SPA">
<s0>Enzima</s0>
</fC07>
<fC07 i1="05" i2="X" l="FRE">
<s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="05" i2="X" l="ENG">
<s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="05" i2="X" l="SPA">
<s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="06" i2="X" l="FRE">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="06" i2="X" l="ENG">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="06" i2="X" l="SPA">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="FRE">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="ENG">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="SPA">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="08" i2="X" l="FRE">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="08" i2="X" l="ENG">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="08" i2="X" l="SPA">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="09" i2="X" l="FRE">
<s0>Agrume</s0>
<s5>32</s5>
</fC07>
<fC07 i1="09" i2="X" l="ENG">
<s0>Citrus fruit</s0>
<s5>32</s5>
</fC07>
<fC07 i1="09" i2="X" l="SPA">
<s0>Agrios</s0>
<s5>32</s5>
</fC07>
<fC07 i1="10" i2="X" l="FRE">
<s0>Fruit</s0>
<s5>33</s5>
</fC07>
<fC07 i1="10" i2="X" l="ENG">
<s0>Fruit</s0>
<s5>33</s5>
</fC07>
<fC07 i1="10" i2="X" l="SPA">
<s0>Fruto</s0>
<s5>33</s5>
</fC07>
<fC07 i1="11" i2="X" l="FRE">
<s0>Polyoside</s0>
<s2>NK</s2>
<s5>34</s5>
</fC07>
<fC07 i1="11" i2="X" l="ENG">
<s0>Polysaccharide</s0>
<s2>NK</s2>
<s5>34</s5>
</fC07>
<fC07 i1="11" i2="X" l="SPA">
<s0>Poliósido</s0>
<s2>NK</s2>
<s5>34</s5>
</fC07>
<fC07 i1="12" i2="X" l="FRE">
<s0>Biopolymère</s0>
<s5>54</s5>
</fC07>
<fC07 i1="12" i2="X" l="ENG">
<s0>Biopolymer</s0>
<s5>54</s5>
</fC07>
<fC07 i1="12" i2="X" l="SPA">
<s0>Biopolímero</s0>
<s5>54</s5>
</fC07>
<fN21>
<s1>246</s1>
</fN21>
<fN82>
<s1>PSI</s1>
</fN82>
</pA>
</standard>
<server>
<NO>PASCAL 03-0344968 INIST</NO>
<ET>Separation and characterization of a salt-dependent pectin methylesterase from Citrus sinensis Var. valencia fruit tissue</ET>
<AU>CAMERON (Randall G.); SAVARY (Brett J.); HOTCHKISS (Arland T.); FISHMAN (Marshall L.); CHAU (H. O. A. K.); BAKER (Robert A.); GROHMANN (Karel)</AU>
<AF>Citrus and Subtropical Products Laboratory, South Atlantic Area, Agricultural Research Service, U.S. Department of Agriculture, 600 Avenue South N.W./Winter Haven, Florida 33881/Etats-Unis (1 aut.); Eastern Regional Research Center, North Atlantic Area, Agricultural Research Service, U.S. Department of Agriculture, 600 Mermaid Lane/Wyndmoor, Pennsylvania 19038/Etats-Unis (2 aut., 3 aut., 4 aut., 5 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of agricultural and food chemistry : (Print); ISSN 0021-8561; Coden JAFCAU; Etats-Unis; Da. 2003; Vol. 51; No. 7; Pp. 2070-2075; Bibl. 39 ref.</SO>
<LA>Anglais</LA>
<EA>A pectin methylesterase (PME) from sweet orange fruit rag tissue, which does not destabilize citrus juice cloud, has been characterized. It is a salt-dependent PME (type II) and exhibits optimal activity between 0.1 and 0.2 M NaCI at pH 7.5. The pH optimum shifted to a more alkaline range as the salt molarity decreased (pH 8.5-9.5 at 50 mM NaCI). It has an apparent molecular mass of 32.4 kDa as determined by gel filtration chromatography, an apparent molecular mass of 33.5 kDa as determined by denaturing electrophoresis, and a pl of 10.1 and exhibits a single activity band after isoelectric focusing (IEF). It has a K
<sub>m</sub>
of 0.0487 mg/mL and a V
<sub>max</sub>
of 4.2378 nkat/mg of protein on 59% DE citrus pectin. Deblocking the N-terminus revealed a partial peptide composed of SVTPNV. Deesterification of non-calcium-sensitive pectin by 6.5% increased the calcium-sensitive pectin ratio (CSPR) from 0. 045 ± 0.011 to 0. 829 ± 0.033 but had little, if any, effect on pectin molecular weight. These properties indicate this enzyme will be useful for studying the PME mode of action as it relates to juice cloud destabilization.</EA>
<CC>002A35B09</CC>
<FD>Caractérisation; Séparation; Pectinesterase; Sensibilité résistance; Activité enzymatique; Citrus sinensis; Sel; Galacturonique acide; Pectine</FD>
<FG>Carboxylic ester hydrolases; Esterases; Hydrolases; Enzyme; Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Agrume; Fruit; Polyoside; Biopolymère</FG>
<ED>Characterization; Separation; Pectinesterase; Sensitivity resistance; Enzymatic activity; Citrus sinensis; Salt; Galacturonic acid; Pectin</ED>
<EG>Carboxylic ester hydrolases; Esterases; Hydrolases; Enzyme; Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Citrus fruit; Fruit; Polysaccharide; Biopolymer</EG>
<SD>Caracterización; Separación; Pectinesterase; Sensibilidad resistencia; Actividad enzimática; Citrus sinensis; Sal; Galacturónico ácido; Pectina</SD>
<LO>INIST-7332.354000109555090500</LO>
<ID>03-0344968</ID>
</server>
</inist>
</record>

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