Abstract
The actin filament-associated protein of 110 kDa (AFAP-110) was first identified as an SH3/SH2 binding partner for the nonreceptor tyrosine kinase, Src. Subsequent data have demonstrated that AFAP-110 can interact with other Src family members. AFAP-110 contains additional protein binding modules including two pleckstrin homology domains, a leucine zipper motif and a target sequence for serine/threonine phosphorylation. AFAP-110 interacts with actin filaments directly via a carboxy terminal actin-binding domain. Thus AFAP-110 may function as an adaptor protein by linking Src family members and/or other signaling proteins to actin filaments. AFAP-110 also has an intrinsic capability to alter actin filament integrity that can be revealed upon conformational changes associated with phosphorylation or mutagenesis. Recent data has indicated that AFAP-110 may also serve to activate cSrc in response to this conformational change as well. Thus, AFAP-110 may function in several ways by (1) acting as an adaptor protein that links signaling molecules to actin filaments, (2) serving as a platform for the construction of larger signaling complexes, (3) serving as an activator of Src family kinases in response to cellular signals that alter its conformation and (4) directly effecting actin filament organization as an actin filament cross-linking protein. Here, we will review the structure and function of AFAP-110 as well as potential binding partners and effectors of AFAP-110's ability to alter actin filament integrity.
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Acknowledgements
The authors would like to acknowledge Michael Seckl, Bing-Hua Jiang, Mingyao Liu, Sue Fessler and Jamie Enomoto-Baisden for critical review and comments. This work was supported by a grant from the NCI, CA60731.
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Baisden, J., Qian, Y., Zot, H. et al. The actin filament-associated protein AFAP-110 is an adaptor protein that modulates changes in actin filament integrity. Oncogene 20, 6435–6447 (2001). https://doi.org/10.1038/sj.onc.1204784
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DOI: https://doi.org/10.1038/sj.onc.1204784
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