Abstract
As a major regulator of Cdk5, the protein p35 exerts various effects on neuronal cells. Under certain conditions, p35 undergoes truncation of its N-terminus to form the protein p25. Although p25 is equally potent in activating Cdk5 as p35, it displays a number of differences from the latter, indicating an indispensable role of the N-terminal region for carrying out many of the Cdk5-p35 activities. A number of proteins have been identified that interact with p35 via its N-terminus. Such binding confers p35 and Cdk5 a multitude of properties, including regulation of Cdk5 activity by interacting with the proteins SET, CK2, importins β, 5 and 7, as well as the microtubule cytoskeleton; mediation of nuclear import of p35 through binding with the importin proteins; and participation in the control of protein biogenesis by regulating ribosomal protein S6 kinase 1. p35 itself also functions as a microtubule-associated protein through its N-terminus to regulate microtubule dynamics which is required for neurite outgrowth. Therefore, the discovery of p35–N-terminal binding partners has facilitated the elucidation of p35 and Cdk5 functions and regulations.
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This work was supported by the Earmarked Research Grant from the Research Grants Council and the Area of Excellence Scheme under the University Grants Committee of Hong Kong.
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Ng, G.K.H., He, L., Qi, R.Z. (2008). Protein–Protein Interactions Involving the N-Terminus of p35. In: Ip, N.Y., Tsai, LH. (eds) Cyclin Dependent Kinase 5 (Cdk5). Springer, Boston, MA. https://doi.org/10.1007/978-0-387-78887-6_12
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DOI: https://doi.org/10.1007/978-0-387-78887-6_12
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