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Makrigiannis, A.P. et al.

Identification of the Ly49L protein: evidence for activating counterparts to inhibitory Ly49 proteins.

Previous studies have indicated that NK cells from different strains of inbred mice may express distinct Ly49 repertoires. Screening of NK cells from the CBA/J mouse for inhibitory and activating Ly49s revealed a novel DAP12-associated receptor that was immunoprecipitated with the Ly49G-specific mAb 4D11. Degenerate primers were designed to amplify and clone Ly49 cDNAs from CBA/J NK cells. A novel activating Ly49 cDNA was identified, which bears strong homology to the partially sequenced Ly49l gene found in C57BL/6 mice. Transfection of Ly49l into a DAP12+ cell line and subsequent immunoprecipitation experiments showed that Ly49L is likely the activating Ly49 detected by the 4DD11 antibody in CBA/J NK cells. Antibody-mediated cross-linking of Ly49L induced DAP12 phosphorylation, providing evidence that Ly49L is a functional activating receptor. Comparison of the extracellular domains of Ly49 family members indicates that all known activating members have an inhibitory counterpart with a highly related extracellular region.[1]

References

Identification of the Ly49L protein: evidence for activating counterparts to inhibitory Ly49 proteins. Makrigiannis, A.P., Etzler, J., Winkler-Pickett, R., Mason, A., Ortaldo, J.R., Anderson, S.K. J. Leukoc. Biol. (2000) [Pubmed]

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