MOLECULAR CLONING OF THE GUINEA-PIG IL-5 RECEPTOR α AND β SUBUNITS AND RECONSTITUTION OF A HIGH AFFINITY RECEPTOR

The functional IL-5 receptor is a heteromeric complex consisting of an α and β subunit. The cloning, sequencing and expression of guinea-pig IL-5Rα and β subunits is described. The guinea-pig IL-5Rα subunit cDNA encodes a protein of Mr47kDa, which is 72 and 66% homologous to the human and murine ort...

Full description

Saved in:
Bibliographic Details
Published in:Cytokine (Philadelphia, Pa.) Pa.), 2000-07, Vol.12 (7), p.858-866
Main Authors: Scott, Clay W, Logsdon, Naomi J., Wilkins, Deidre E., Norris, Tyrrell E., Sobotka-Briner, Cindy, Hubbs, Stephen, Graham, Alexander
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Cell Line
Cloning, Molecular
cytokine/eosinophil/guinea-pig/interleukin 5/IL-5R
Gene Expression
Guinea Pigs
Humans
Interleukin-5 - metabolism
Molecular Sequence Data
Protein Binding
Protein Isoforms - genetics
Protein Isoforms - metabolism
Receptors, Interleukin - genetics
Receptors, Interleukin - metabolism
Receptors, Interleukin-5
Recombinant Fusion Proteins - genetics
Recombinant Fusion Proteins - metabolism
Sequence Analysis, DNA
Spodoptera - cytology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The functional IL-5 receptor is a heteromeric complex consisting of an α and β subunit. The cloning, sequencing and expression of guinea-pig IL-5Rα and β subunits is described. The guinea-pig IL-5Rα subunit cDNA encodes a protein of Mr47kDa, which is 72 and 66% homologous to the human and murine orthologs, respectively. Three guinea-pig IL-5Rβ subunit cDNA clones were isolated, which differ in the N-terminus and are 56–64% homologous to the human and murine IL-5Rβ subunits. Expressing human IL-5Rαβ and guinea-pig IL-5Rαβ1in the baculovirus-insect cell system resulted in recombinant receptors which bound hIL-5 with high affinity (Kd=0.19 and 0.11nM, respectively). Expressing just gpIL-5Rα was not sufficient to demonstrate binding. This contrasts with the human receptor, where hIL-5Rα alone can bind hIL-5 with high affinity. gpIL-5Rαβ1bound both hIL-5 and mIL-5 with comparable affinity (Ki=0.10 and 0.06nM), similar to that seen with hIL-5Rαβ. Thus, both the heteromeric hIL-5R and gpIL-5Rαβ1can bind multiple IL-5 orthologs with high affinity whereas the murine IL-5R is selective for the murine ligand.
ISSN:1043-4666
1096-0023
DOI:10.1006/cyto.1999.0657