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The integrity of the SH3 binding motif of AFAP-110 is required to facilitate tyrosine phosphorylation by, and stable complex formation with, Src

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Abstract

The actin filament-associated protein AFAP-110 forms a stable complex with activated variants of Src in chick embryo fibroblast cells. Stable complex formation requires the integrity of the Src SH2 and SH3 domains. In addition, AFAP-110 encodes two adjacent SH3 binding motifs and six candidate SH2 binding motifs. These data indicate that both SH2 and SH3 domains may work cooperatively to facilitate Src/AFAP-110 stable complex formation. As a test for this hypothesis, we sought to understand whether one or both SH3 binding motifs in AFAP-110 modulate interactions with the Src SH3 domain and if this interaction was required to present AFAP-110 for tyrosine phosphorylation by, and stable complex formation with, Src. A proline to alanine site-directed mutation in the amino terminal SH3 binding motif (SH3bm I) was sufficient to abrogate absorption of AFAP-110 with GST-SH3src. Co-expression of activated Src (pp60527F) with AFAP-110 in Cos-1 cells permit tyrosine phosphorylation of AFAP-110 a nd stable complex formation with pp60527F. However, co-expression of the SH3 null-binding mutant (AFAP71A) with pp60527F revealed a 2.7 fold decrease in steady-state levels of tyrosine phosphorylation, compared to AFAP-110. Although a lower but detectable level of AFAP71A was phosphorylated on tyrosine, AFAP71A could not be detected in stable complex with pp60527F, unlike AFAP-110. These data indicate that SH3 interactions facilitate presentation of AFAP-110 for tyrosine phosphorylation and are also required for stable complex formation with pp60527F. (Mol Cell Biochem 175: 243–252, 1997)

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  1. The Mary Babb Randolph Cancer Center and the Department of Microbiology and Immunology, West Virginia University, Morgantown, WV, 26506-9300, USA

    Anne C. Guappone & Daniel C. Flynn

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  1. Anne C. Guappone
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Guappone, A.C., Flynn, D.C. The integrity of the SH3 binding motif of AFAP-110 is required to facilitate tyrosine phosphorylation by, and stable complex formation with, Src. Mol Cell Biochem 175, 243–252 (1997). https://doi.org/10.1023/A:1006840104666

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