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HLA-DRα chain residues located on the outer loops are involved in nonpolymorphic and polymorphic antibody-binding epitopes

Identifieur interne : 000822 ( Istex/Corpus ); précédent : 000821; suivant : 000823

HLA-DRα chain residues located on the outer loops are involved in nonpolymorphic and polymorphic antibody-binding epitopes

Auteurs : Xin-Ting Fu ; Robert W. Karr

Source :

RBID : ISTEX:23A1B868EC5B00236B6C5A8147FC1A0CDE71861B

English descriptors

Abstract

Abstract: The structure-function relationships of the HLA-DRα chain have been analyzed by identifying DRα residues involved in several nonpolymorphic and polymorphic antibody epitopes. Antibody binding to transfectants expressing a WT or mutant DRα chain with the WT DR (β1∗0701) chain was analyzed. Our results indicate that residues 18, 36, and 39 located on the outer loops of the DRα chain are critical for one of more of the epitopes recognized by the SG157, Q2/70, L243, LB3. 1, D1-12, and CL413 mAbs. Similar results were obtained when the DRα position 18 and 39 mutants were expressed with other DRβ1 allesles. Furthermore, residues 15 and 18 of the DRα chain were shown to be involved in the epitopes of two polymorphic mAbs, HU-26 and I-2, whose epitopes also include residue 4 of the corresponding DRβ chains. In addition to their involvement in antibody-binding epitopes, residues in this region on the outer surface of the DRα chain have also been shown to be involved in superantigen binding and presentation and T-cell recognition of foreign antigen, emphasizing the functional importance of DRα-chain residues located outside of the peptide-binding groove.

Url:
DOI: 10.1016/0198-8859(94)90268-2

Links to Exploration step

ISTEX:23A1B868EC5B00236B6C5A8147FC1A0CDE71861B

Le document en format XML

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<ce:text>Address reprint requests to Dr. X.-T. Fu, Monsanto Co./AA4C, 700 Chesterfield Parkway North, St. Louis, MO 63198, USA</ce:text>
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<ce:date-received day="28" month="6" year="1993"></ce:date-received>
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<ce:section-title>Abstract</ce:section-title>
<ce:abstract-sec>
<ce:simple-para>The structure-function relationships of the HLA-DRα chain have been analyzed by identifying DRα residues involved in several nonpolymorphic and polymorphic antibody epitopes. Antibody binding to transfectants expressing a WT or mutant DRα chain with the WT DR (β1
<ce:sup></ce:sup>
0701) chain was analyzed. Our results indicate that residues 18, 36, and 39 located on the outer loops of the DRα chain are critical for one of more of the epitopes recognized by the SG157, Q2/70, L243, LB3. 1, D1-12, and CL413 mAbs. Similar results were obtained when the DRα position 18 and 39 mutants were expressed with other DRβ1 allesles. Furthermore, residues 15 and 18 of the DRα chain were shown to be involved in the epitopes of two polymorphic mAbs, HU-26 and I-2, whose epitopes also include residue 4 of the corresponding DRβ chains. In addition to their involvement in antibody-binding epitopes, residues in this region on the outer surface of the DRα chain have also been shown to be involved in superantigen binding and presentation and T-cell recognition of foreign antigen, emphasizing the functional importance of DRα-chain residues located outside of the peptide-binding groove.</ce:simple-para>
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<abstract lang="en">Abstract: The structure-function relationships of the HLA-DRα chain have been analyzed by identifying DRα residues involved in several nonpolymorphic and polymorphic antibody epitopes. Antibody binding to transfectants expressing a WT or mutant DRα chain with the WT DR (β1∗0701) chain was analyzed. Our results indicate that residues 18, 36, and 39 located on the outer loops of the DRα chain are critical for one of more of the epitopes recognized by the SG157, Q2/70, L243, LB3. 1, D1-12, and CL413 mAbs. Similar results were obtained when the DRα position 18 and 39 mutants were expressed with other DRβ1 allesles. Furthermore, residues 15 and 18 of the DRα chain were shown to be involved in the epitopes of two polymorphic mAbs, HU-26 and I-2, whose epitopes also include residue 4 of the corresponding DRβ chains. In addition to their involvement in antibody-binding epitopes, residues in this region on the outer surface of the DRα chain have also been shown to be involved in superantigen binding and presentation and T-cell recognition of foreign antigen, emphasizing the functional importance of DRα-chain residues located outside of the peptide-binding groove.</abstract>
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