期刊
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH
卷 1843, 期 11, 页码 2765-2774出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbamcr.2014.07.021
关键词
Autophagy; cAMP signalling; p62; Phosphodiesterase; Protein kinase A; Protein-protein interaction
资金
- Medical Research Council (UK) [MRC G0600765]
- Medical Research Council [MR/J007412/1, G0600765] Funding Source: researchfish
- MRC [MR/J007412/1, G0600765] Funding Source: UKRI
p62, also known as SQSTM1, is a multi-domain signalling scaffold protein involved in numerous critical cellular functions such as autophagy, apoptosis and inflammation. Crucial interactions relevant to these functions are mediated by the N-terminal Phox and Bem1p (PB1) domain, which is divided into two interaction surfaces, one of predominantly acidic and one of basic character. Most known interaction partners, including atypical protein kinase C (aPKC), bind to the basic surface, and acidic-basic interactions at this interface also allow for p62 homopolymerisation. We identify here that the coupling of p62 to the cAMP signalling system is conferred by both the direct binding of cAMP degrading phosphodiesterase-4 (PDE4) to the acidic surface of the p62 PB1 domain and the phosphorylation of the basic surface of this domain by CAMP-dependent protein kinase (PKA). Such phosphoiylation is a previously unknown means of regulating PB1 domain interaction partnerships by disrupting the interaction of p62 with basic surface binding partners, such as aPKCs, as well as p62 homopolymerisation. Thus, we uncover a new regulatory mechanism that connects cAMP signalling with the p62 multi-domain signalling scaffold and autophagy cargo receptor protein. (C) 2014 Elsevier B.V. All rights reserved.
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