4.5 Article

Protein 4.1G binds to a unique motif within the Fc-gamma RI cytoplasmic tail

期刊

MOLECULAR IMMUNOLOGY
卷 45, 期 7, 页码 2069-2075

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.molimm.2007.10.024

关键词

Fc receptor; yeast two-hybrid; molecular interaction; mutagenesis; domain mapping

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The C-terminal domain of protein 4.1G was identified to interact with the cytosolic tail of the high affinity IgG receptor, Fc gamma RI, in yeast two-hybrid screens. Proteins of the 4.1 family have previously been found to mediate receptor/cytoskeleton interactions. In the study presented here, we show an alternatively spliced 4.1G product to be associated with increased Fc-gamma RI binding in yeast two-hybrid assays, and to be selectively enriched in most immune cells at the transcript level. In addition, a detailed analysis of the 4.1G 'docking site' within Fc gamma RI is provided by examining Fc gamma RI-CY-truncated and alanine-substituted mutants. These pointed to an Fc gamma RI membrane-proximal core motif of HxxBxxxBB (H represents hydrophobic residues, B basic residues and x represents any residue), followed by hydrophobic and (potentially) negatively charged residues to be central for interaction with protein 4.1G. (C) 2007 Elsevier Ltd. All rights reserved.

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