JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
REVIEW
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Receptor tyrosine kinase signaling--a proteomic perspective.

The RTKs are one of the most important families mediating transmembrane signaling and they participate and are instrumental in regulating a broad range of physiological activities. Indeed, tyrosine kinases in general, and the processes that they control and/or stimulate, provide a rich source of drug targets, particularly in growth related disorders such as cancer (Zwick et al., 2002; Krause and Van Etten, 2005). However, there remain many questions regarding their activation and downstream signaling and the application of proteomic analyses promises to answer many of them. There have been relatively few detailed studies of this type to date and it will require considerably more of them to better define the pathways with respect to both the major and minor PTMs that, along with the protein-protein interactions, are the means to direct the flow of the signals generated. It will take such approaches to define the specificity that characterize the individual families, even appreciating that to some degree all are capable of activating many, if not all, of the principal pathways. It will also be necessary to understand, in the highly complex networks of intracellular phosphorylation (that contain thousands of sites of modification and clearly have not yet been fully determined in any paradigm), exactly which kinases modify which substrates, and to work out the inter-relationships with other modifications such as O-GlcNAcylation and acetylation. Only then will it be possible to determine which modifications are physiologically significant and which are simply background. Along theway, these studies should continue to provide potential drug targets and perhaps improve the current lackluster biomarker discovery track record.

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