Autoantigenic epitopes of the B polypeptide of Sm small nuclear RNP particles: Identification of regions accessible only within the U1 small nuclear RNP

Yasuo Ohosone, Tsuneyo Mimori, Takao Fujii, Masashi Akizuki, Yasuo Matsuoka, Shoichiro Irimajiri, John A. Hardin, Joe Craft, Mitsuo Homma

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Objective. To analyze the autoantigenic epitopes of the Sm B polypeptide of the U1 small nuclear RNP (snRNP) using complementary DNA (cDNA) clones. Methods. Expression of Sm B fusion proteins in λ phage vectors, immunoblots, immunoprecipitations, and affinity purification of antibodies. Results. Immunoblots using antibodies affinity-purified from B fusion proteins demonstrated that there were cross-reactive epitopes between the B′/B and A polypeptides of the U1 snRNP. Immunoprecipitation assays suggested that there were at least 3 different autoantigenic epitopes on the B polypeptide that could be classified into 2 general groups based upon autoantibody reactivity. The first group of autoantibodies, which bound 2 separate autoantigenic epitopes (BU1-1, BU1-2), participated in immunoprecipitation of the U1 snRNP alone. The second group, which bound the third type of autoantigenic epitope (BSm-1), immunoprecipitated all the abundant Sm snRNPs. Conclusion. There is at least 1 region on the B proteins that is accessible to antibodies only within the structure of the U1 snRNP, as well as a region that is accessible on all Sm snRNPs. These data support the notion that the native U1 RNP, perhaps containing B proteins in a different conformation than those found on other Sm snRNPs, may drive the humoral immune response in systemic lupus erythematosus.

Original languageEnglish (US)
Pages (from-to)960-966
Number of pages7
JournalArthritis and Rheumatism
Volume35
Issue number8
StatePublished - Aug 1992
Externally publishedYes

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Small Nuclear Ribonucleoproteins
Epitopes
Peptides
Immunoprecipitation
Antibody Affinity
Autoantibodies
Humoral Immunity
Systemic Lupus Erythematosus
Bacteriophages
Complementary DNA
Clone Cells
IgA receptor
Antibodies

ASJC Scopus subject areas

  • Immunology
  • Rheumatology

Cite this

Ohosone, Y., Mimori, T., Fujii, T., Akizuki, M., Matsuoka, Y., Irimajiri, S., ... Homma, M. (1992). Autoantigenic epitopes of the B polypeptide of Sm small nuclear RNP particles: Identification of regions accessible only within the U1 small nuclear RNP. Arthritis and Rheumatism, 35(8), 960-966.

Autoantigenic epitopes of the B polypeptide of Sm small nuclear RNP particles : Identification of regions accessible only within the U1 small nuclear RNP. / Ohosone, Yasuo; Mimori, Tsuneyo; Fujii, Takao; Akizuki, Masashi; Matsuoka, Yasuo; Irimajiri, Shoichiro; Hardin, John A.; Craft, Joe; Homma, Mitsuo.

In: Arthritis and Rheumatism, Vol. 35, No. 8, 08.1992, p. 960-966.

Research output: Contribution to journalArticle

Ohosone, Y, Mimori, T, Fujii, T, Akizuki, M, Matsuoka, Y, Irimajiri, S, Hardin, JA, Craft, J & Homma, M 1992, 'Autoantigenic epitopes of the B polypeptide of Sm small nuclear RNP particles: Identification of regions accessible only within the U1 small nuclear RNP', Arthritis and Rheumatism, vol. 35, no. 8, pp. 960-966.
Ohosone, Yasuo ; Mimori, Tsuneyo ; Fujii, Takao ; Akizuki, Masashi ; Matsuoka, Yasuo ; Irimajiri, Shoichiro ; Hardin, John A. ; Craft, Joe ; Homma, Mitsuo. / Autoantigenic epitopes of the B polypeptide of Sm small nuclear RNP particles : Identification of regions accessible only within the U1 small nuclear RNP. In: Arthritis and Rheumatism. 1992 ; Vol. 35, No. 8. pp. 960-966.
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abstract = "Objective. To analyze the autoantigenic epitopes of the Sm B polypeptide of the U1 small nuclear RNP (snRNP) using complementary DNA (cDNA) clones. Methods. Expression of Sm B fusion proteins in λ phage vectors, immunoblots, immunoprecipitations, and affinity purification of antibodies. Results. Immunoblots using antibodies affinity-purified from B fusion proteins demonstrated that there were cross-reactive epitopes between the B′/B and A polypeptides of the U1 snRNP. Immunoprecipitation assays suggested that there were at least 3 different autoantigenic epitopes on the B polypeptide that could be classified into 2 general groups based upon autoantibody reactivity. The first group of autoantibodies, which bound 2 separate autoantigenic epitopes (BU1-1, BU1-2), participated in immunoprecipitation of the U1 snRNP alone. The second group, which bound the third type of autoantigenic epitope (BSm-1), immunoprecipitated all the abundant Sm snRNPs. Conclusion. There is at least 1 region on the B proteins that is accessible to antibodies only within the structure of the U1 snRNP, as well as a region that is accessible on all Sm snRNPs. These data support the notion that the native U1 RNP, perhaps containing B proteins in a different conformation than those found on other Sm snRNPs, may drive the humoral immune response in systemic lupus erythematosus.",
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T1 - Autoantigenic epitopes of the B polypeptide of Sm small nuclear RNP particles

T2 - Identification of regions accessible only within the U1 small nuclear RNP

AU - Ohosone, Yasuo

AU - Mimori, Tsuneyo

AU - Fujii, Takao

AU - Akizuki, Masashi

AU - Matsuoka, Yasuo

AU - Irimajiri, Shoichiro

AU - Hardin, John A.

AU - Craft, Joe

AU - Homma, Mitsuo

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N2 - Objective. To analyze the autoantigenic epitopes of the Sm B polypeptide of the U1 small nuclear RNP (snRNP) using complementary DNA (cDNA) clones. Methods. Expression of Sm B fusion proteins in λ phage vectors, immunoblots, immunoprecipitations, and affinity purification of antibodies. Results. Immunoblots using antibodies affinity-purified from B fusion proteins demonstrated that there were cross-reactive epitopes between the B′/B and A polypeptides of the U1 snRNP. Immunoprecipitation assays suggested that there were at least 3 different autoantigenic epitopes on the B polypeptide that could be classified into 2 general groups based upon autoantibody reactivity. The first group of autoantibodies, which bound 2 separate autoantigenic epitopes (BU1-1, BU1-2), participated in immunoprecipitation of the U1 snRNP alone. The second group, which bound the third type of autoantigenic epitope (BSm-1), immunoprecipitated all the abundant Sm snRNPs. Conclusion. There is at least 1 region on the B proteins that is accessible to antibodies only within the structure of the U1 snRNP, as well as a region that is accessible on all Sm snRNPs. These data support the notion that the native U1 RNP, perhaps containing B proteins in a different conformation than those found on other Sm snRNPs, may drive the humoral immune response in systemic lupus erythematosus.

AB - Objective. To analyze the autoantigenic epitopes of the Sm B polypeptide of the U1 small nuclear RNP (snRNP) using complementary DNA (cDNA) clones. Methods. Expression of Sm B fusion proteins in λ phage vectors, immunoblots, immunoprecipitations, and affinity purification of antibodies. Results. Immunoblots using antibodies affinity-purified from B fusion proteins demonstrated that there were cross-reactive epitopes between the B′/B and A polypeptides of the U1 snRNP. Immunoprecipitation assays suggested that there were at least 3 different autoantigenic epitopes on the B polypeptide that could be classified into 2 general groups based upon autoantibody reactivity. The first group of autoantibodies, which bound 2 separate autoantigenic epitopes (BU1-1, BU1-2), participated in immunoprecipitation of the U1 snRNP alone. The second group, which bound the third type of autoantigenic epitope (BSm-1), immunoprecipitated all the abundant Sm snRNPs. Conclusion. There is at least 1 region on the B proteins that is accessible to antibodies only within the structure of the U1 snRNP, as well as a region that is accessible on all Sm snRNPs. These data support the notion that the native U1 RNP, perhaps containing B proteins in a different conformation than those found on other Sm snRNPs, may drive the humoral immune response in systemic lupus erythematosus.

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