Receptor for IgA in group A streptococci : cloning of the gene and characterization of the protein expressed in Escherichia coli
(1989) In Molecular Microbiology 3(2). p.239-247- Abstract
The gene for an IgA-binding protein from a group A streptococcal strain was cloned and expressed in Escherichia coli. The IgA-binding protein, called protein Arp, was purified on IgA-Sepharose, allowing complete purification in a single step. Analysis of protein Arp by Western immunoblotting demonstrated a major IgA-binding band, with an apparent molecular weight of 42 kD. The purified protein was shown to bind serum IgA and secretory IgA, as well as monoclonal IgA of both subclasses. There was no binding to IgM, IgD or IgE, but a weak binding to IgG. Inhibition experiments with whole bacteria indicated that IgA and IgG bind at separate sites. Experiments with immunoglobulin fragments showed that protein Arp binds to the Fc region of... (More)
The gene for an IgA-binding protein from a group A streptococcal strain was cloned and expressed in Escherichia coli. The IgA-binding protein, called protein Arp, was purified on IgA-Sepharose, allowing complete purification in a single step. Analysis of protein Arp by Western immunoblotting demonstrated a major IgA-binding band, with an apparent molecular weight of 42 kD. The purified protein was shown to bind serum IgA and secretory IgA, as well as monoclonal IgA of both subclasses. There was no binding to IgM, IgD or IgE, but a weak binding to IgG. Inhibition experiments with whole bacteria indicated that IgA and IgG bind at separate sites. Experiments with immunoglobulin fragments showed that protein Arp binds to the Fc region of both IgA and IgG. The equilibrium constant of the reaction between protein Arp and polyclonal human IgA was determined to be 5.6 x 10(8) M-1. Amino acid sequencing of protein Arp demonstrated a direct repeat of 7 amino acids in the NH2-terminal region, a feature previously found in several streptococcal M proteins. This suggests that protein Arp, like M proteins, may be a streptococcal virulence factor.
(Less)
- author
- Lindahl, G LU and Akerström, B LU
- organization
- publishing date
- 1989-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Amino Acid Sequence, Bacterial Proteins/genetics, Blotting, Western, Chemical Phenomena, Chemistry, Chromatography, Affinity, Cloning, Molecular, DNA, Bacterial/genetics, Electrophoresis, Polyacrylamide Gel, Escherichia coli/genetics, Genes, Genes, Bacterial, Immunoglobulin A/metabolism, Molecular Sequence Data, Protein Binding, Receptors, Fc, Receptors, Immunologic/genetics, Recombinant Proteins/genetics, Streptococcus pyogenes/genetics
- in
- Molecular Microbiology
- volume
- 3
- issue
- 2
- pages
- 239 - 247
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:2668688
- scopus:0024463060
- ISSN
- 0950-382X
- DOI
- 10.1111/j.1365-2958.1989.tb01813.x
- language
- English
- LU publication?
- yes
- id
- 99941621-0db4-4be7-9201-6d89fbdb3447
- date added to LUP
- 2019-05-22 10:30:10
- date last changed
- 2024-06-12 16:04:46
@article{99941621-0db4-4be7-9201-6d89fbdb3447,
abstract = {{<p>The gene for an IgA-binding protein from a group A streptococcal strain was cloned and expressed in Escherichia coli. The IgA-binding protein, called protein Arp, was purified on IgA-Sepharose, allowing complete purification in a single step. Analysis of protein Arp by Western immunoblotting demonstrated a major IgA-binding band, with an apparent molecular weight of 42 kD. The purified protein was shown to bind serum IgA and secretory IgA, as well as monoclonal IgA of both subclasses. There was no binding to IgM, IgD or IgE, but a weak binding to IgG. Inhibition experiments with whole bacteria indicated that IgA and IgG bind at separate sites. Experiments with immunoglobulin fragments showed that protein Arp binds to the Fc region of both IgA and IgG. The equilibrium constant of the reaction between protein Arp and polyclonal human IgA was determined to be 5.6 x 10(8) M-1. Amino acid sequencing of protein Arp demonstrated a direct repeat of 7 amino acids in the NH2-terminal region, a feature previously found in several streptococcal M proteins. This suggests that protein Arp, like M proteins, may be a streptococcal virulence factor.</p>}},
author = {{Lindahl, G and Akerström, B}},
issn = {{0950-382X}},
keywords = {{Amino Acid Sequence; Bacterial Proteins/genetics; Blotting, Western; Chemical Phenomena; Chemistry; Chromatography, Affinity; Cloning, Molecular; DNA, Bacterial/genetics; Electrophoresis, Polyacrylamide Gel; Escherichia coli/genetics; Genes; Genes, Bacterial; Immunoglobulin A/metabolism; Molecular Sequence Data; Protein Binding; Receptors, Fc; Receptors, Immunologic/genetics; Recombinant Proteins/genetics; Streptococcus pyogenes/genetics}},
language = {{eng}},
number = {{2}},
pages = {{239--247}},
publisher = {{Wiley-Blackwell}},
series = {{Molecular Microbiology}},
title = {{Receptor for IgA in group A streptococci : cloning of the gene and characterization of the protein expressed in Escherichia coli}},
url = {{http://dx.doi.org/10.1111/j.1365-2958.1989.tb01813.x}},
doi = {{10.1111/j.1365-2958.1989.tb01813.x}},
volume = {{3}},
year = {{1989}},
}