Abstract：
:The glycosyl phosphatidylinositol (GPI)-linked antigen recognized by monoclonal antibody (mAb) MEM-102 is expressed on all peripheral blood lymphocytes, both resting and activated. Its properties are very similar to a previously described activation antigen, Blast-1. The amino acid sequence deduced from the structure of cloned cDNA is identical to that of the Blast-1 antigen except for a single amino acid residue. There are several other minor differences in the nucleotide sequence of the Blast-1 and MEM-102 cDNAs that do not affect the predicted structure of the polypeptide product. The amino acid sequence of the first 15 N-terminal residues of the antigen purified from Raji cells is found in the deduced sequence close to the presumed boundary between the leader peptide and mature polypeptide. Properties of the recombinant product expressed in COS cells are similar to the antigen isolated from peripheral blood mononuclear cells (PBMNCs) or B-and T-cells lines. The antigen purified on immobilized mAb MEM-102 is recognized by all six known CD48 mAbs under western blotting conditions. COS cells transfected with MEM-102 cDNA react with all the CD48 mAbs. It is concluded that mAb MEM-102 is directed against the as yet poorly characterized antigen CD48, which is therefore structurally closely related to Blast-1. Several possibilities are discussed that might account for the apparent discrepancy between the broad pan-leucocyte expression of the between the broad pan-leucocyte expression of the MEM-102/CD48 antigen and much more restricted expression of the epitope recognized by the previously described mAb defining the Blast-1 antigen.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Korínek V,Stefanová I,Angelisová P,Hilgert I,Horejsí Vdoi
10.1007/BF00210823subject
Has Abstractpub_date
1991-01-01 00:00:00pages
108-12issue
2eissn
0093-7711issn
1432-1211journal_volume
33pub_type
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