Importance of arginine residues in the determination of the biological activity of human corticosteroid-binding globulin

La capacité de la transcortine humaine de lier les corticostéroïdes est dépendante du pH et gouvernée en milieu alcalin par le pK des résidus d'arginine. Il n'y a pas d'arginine essentielle dans le site de liaison. La perte de l'activité biologique est rapide et complète dès qu&#...

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Published inBiochimie Vol. 65; no. 10; pp. 579 - 583
Main Authors Perini, J.M., Le Gaillard, F., Aubert, J.P., Dautrevaux, M.
Format Journal Article
LanguageEnglish
Published Paris Elsevier Masson SAS 01.10.1983
Elsevier
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Abstract La capacité de la transcortine humaine de lier les corticostéroïdes est dépendante du pH et gouvernée en milieu alcalin par le pK des résidus d'arginine. Il n'y a pas d'arginine essentielle dans le site de liaison. La perte de l'activité biologique est rapide et complète dès qu'un résidu d'arginine est modifié par le phénylglyoxal. Il y a également une transconformation de la molécule de transcortine. C'est pourquoi l'étonnante stabilité de la transcortine à pH 11,5 peut être expliquée par une grande dépendance de la structure tertiaire vis-à-vis de l'intégrité d'un résidu d'arginine: aussi longtemps que l'état d'ionisation de celui-ci n'est pas changé (pH < pK du groupement guanidyl), la structure tertiaire de la transcortine biologiquement active est conservée en milieu alcalin. The binding activity of human corticosteroid-binding globulin (CBG) is pH dependent and governed in alkaline pH ranges by the pK of arginine. No essential arginine residue is located in the binding site. The loss of biological activity is rapid and complete as soon as one arginine residue is modified by phenylglyoxal. There is also a transconformation of the CBG molecule. Therefore the surprising stability of CBG up to pH 11.5 may be explained by a large dependence of the CBG tertiary structure on the integrity of one arginine residue: as long as the ionized state of this single residue is not changed (pH < pK of the guanidyl group) the tertiary structure of the biologically active CBG is maintained in alkaline pH ranges.
AbstractList The binding activity of human corticosteroid-binding globulin (CBG) is pH dependent and governed in alkaline pH ranges by the pK of arginine. No essential arginine residues is located in the binding site. The loss of biological activity is rapid and complete as soon as one arginine residue is modified by phenylglyoxal. There is also a transconformation of the CBG molecule. Therefore the surprising stability of CBG up to pH 11.5 may be explained by a large dependence of the CBG tertiary structure on the integrity of one arginine residue : as long as the ionized state of this single residue is not changed (pH less than pK of the guanidyl group) the tertiary structure of the biologically active CBG is maintained in alkaline pH ranges.
La capacité de la transcortine humaine de lier les corticostéroïdes est dépendante du pH et gouvernée en milieu alcalin par le pK des résidus d'arginine. Il n'y a pas d'arginine essentielle dans le site de liaison. La perte de l'activité biologique est rapide et complète dès qu'un résidu d'arginine est modifié par le phénylglyoxal. Il y a également une transconformation de la molécule de transcortine. C'est pourquoi l'étonnante stabilité de la transcortine à pH 11,5 peut être expliquée par une grande dépendance de la structure tertiaire vis-à-vis de l'intégrité d'un résidu d'arginine: aussi longtemps que l'état d'ionisation de celui-ci n'est pas changé (pH < pK du groupement guanidyl), la structure tertiaire de la transcortine biologiquement active est conservée en milieu alcalin. The binding activity of human corticosteroid-binding globulin (CBG) is pH dependent and governed in alkaline pH ranges by the pK of arginine. No essential arginine residue is located in the binding site. The loss of biological activity is rapid and complete as soon as one arginine residue is modified by phenylglyoxal. There is also a transconformation of the CBG molecule. Therefore the surprising stability of CBG up to pH 11.5 may be explained by a large dependence of the CBG tertiary structure on the integrity of one arginine residue: as long as the ionized state of this single residue is not changed (pH < pK of the guanidyl group) the tertiary structure of the biologically active CBG is maintained in alkaline pH ranges.
The binding activity of human corticosteroid binding globulin (CBG) is pH dependent and governed in alkaline pH ranges by the pK of arginine. No essential arginine residue is located in the binding site. The loss of biological activity is rapid and complete as soon as one arginine residue is modified by phenylglyoxal. There is also a transconformation of the CBG molecule. Therefore the surprising stability of CBG up to pH 11.5 may be explained by a large dependence of the CBG tertiary structure on the integrity of one arginine residue: as long as the ionized state of this single residue is not changed (pH < pK of the guanidyl group) the tertiary structure of the biologically active CBG is maintained in alkaline pH ranges.
Author Dautrevaux, M.
Perini, J.M.
Le Gaillard, F.
Aubert, J.P.
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Issue 10
Keywords site de liaison
transcortin
transcortine
phenylglyoxal
corticosteroid-binding globulin
binding site
Human
Corticosteroid
Binding protein
Chemical modification
Steroid hormone
Transcortin
Molecular interaction
Binding site
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Takahashi (bib6) 1977; 81
Takahashi (bib7) 1977; 81
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Le Gaillard, Racadot, Aubert, Dautrevaux (bib9) 1982; 57
Le Gaillard, Dautrevaux (bib4) 1977; 495
Stroupe, Harding, Forsthoefel, Westphal (bib3) 1978; 17
Le Gaillard, F. (Unpublished result).
Takahashi (bib8) 1962; 52
Le Gaillard, Han, Dautrevaux (bib2) 1975; 57
Le Gaillard (10.1016/S0300-9084(83)80108-4_bib2) 1975; 57
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10.1016/S0300-9084(83)80108-4_bib5
Takahashi (10.1016/S0300-9084(83)80108-4_bib7) 1977; 81
Le Gaillard (10.1016/S0300-9084(83)80108-4_bib9) 1982; 57
Mickelson (10.1016/S0300-9084(83)80108-4_bib10) 1981; 20
Takahashi (10.1016/S0300-9084(83)80108-4_bib8) 1962; 52
Stroupe (10.1016/S0300-9084(83)80108-4_bib3) 1978; 17
Le Gaillard (10.1016/S0300-9084(83)80108-4_bib1) 1974; 56
Le Gaillard (10.1016/S0300-9084(83)80108-4_bib4) 1977; 495
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Snippet La capacité de la transcortine humaine de lier les corticostéroïdes est dépendante du pH et gouvernée en milieu alcalin par le pK des résidus d'arginine. Il...
The binding activity of human corticosteroid-binding globulin (CBG) is pH dependent and governed in alkaline pH ranges by the pK of arginine. No essential...
The binding activity of human corticosteroid binding globulin (CBG) is pH dependent and governed in alkaline pH ranges by the pK of arginine. No essential...
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SubjectTerms Analytical, structural and metabolic biochemistry
Arginine
Binding and carrier proteins
binding site
Biological and medical sciences
Circular Dichroism
corticosteroid-binding globulin
Fundamental and applied biological sciences. Psychology
Humans
Hydrocortisone - metabolism
Hydrogen-Ion Concentration
Kinetics
phenylglyoxal
Phenylglyoxal - metabolism
Protein Binding
Protein Conformation
Proteins
site de liaison
transcortin
Transcortin - metabolism
transcortine
Title Importance of arginine residues in the determination of the biological activity of human corticosteroid-binding globulin
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