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Characterization of mouse ALCAM (CD166): the CD6-binding domain is conserved in different homologs and mediates cross-species binding.

Abstract：

:Activated leukocyte cell adhesion molecule (ALCAM; CD166) is a member of the immunoglobulin gene superfamily (IgSF) which is expressed by activated leukocytes and thymic epithelial cells and is a ligand for the lymphocyte antigen CD6. Herein, we report on the isolation and characterization of cDNA clones encoding mouse ALCAM (mALCAM). Comparison of the predicted amino acid sequence of mALCAM and human ALCAM (hALCAM) showed an overall identity of 93%. Binding studies with truncated forms of the extracellular region of mALCAM showed that the CD6 binding site is located in the N-terminal Ig-like domain and that mALCAM is capable of binding both human and mouse CD6. Mutagenesis studies on hALCAM suggested that residues critical for CD6 binding map to the predicted A'GFCC'C" beta-sheet of ALCAM's N-terminal binding domain. Residue differences in the N-terminal domains of mALCAM and hALCAM were analyzed with the aid of a molecular model of ALCAM. All residues critical for CD6 binding are conserved in both mALCAM and hALCAM, whereas residue differences map to the predicted BED face which is opposite the CD6 binding site on hALCAM. These findings provide a molecular rationale for the observed cross-species CD6/ALCAM interaction and the apparent inability to generate monoclonal antibodies (mAb) against the CD6 binding site. RNA blot analysis showed that mRNA transcripts encoding mALCAM are expressed in the brain, lung, liver, and the kidney, as well as by activated leukocytes and a number of cell lines. A rat mAb specific for mALCAM was produced and by two-color immunofluorescence studies was shown to bind to both activated CD4+ and CD8+ T cells.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Bowen MA,Bajorath J,D'Egidio M,Whitney GS,Palmer D,Kobarg J,Starling GC,Siadak AW,Aruffo A

doi

10.1002/eji.1830270625

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

1469-78

issue

6

eissn

0014-2980

issn

1521-4141

journal_volume

27

pub_type

杂志文章

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