Abstract:
:Loss-of-function in melanocortin 1 receptor (MC1R), a GS protein-coupled receptor that regulates signal transduction through cAMP and protein kinase A (PKA) in melanocytes, is a major inherited melanoma risk factor. Herein, we report a novel cAMP-mediated response for sensing and responding to UV-induced DNA damage regulated by A-kinase-anchoring protein 12 (AKAP12). AKAP12 is identified as a necessary participant in PKA-mediated phosphorylation of ataxia telangiectasia mutated and Rad3-related (ATR) at S435, a post-translational event required for cAMP-enhanced nucleotide excision repair (NER). Moreover, UV exposure promotes ATR-directed phosphorylation of AKAP12 at S732, which promotes nuclear translocation of AKAP12-ATR-pS435. This complex subsequently recruits XPA to UV DNA damage and enhances 5' strand incision. Preventing AKAP12's interaction with PKA or with ATR abrogates ATR-pS435 accumulation, delays recruitment of XPA to UV-damaged DNA, impairs NER and increases UV-induced mutagenesis. Our results define a critical role for AKAP12 as an UV-inducible scaffold for PKA-mediated ATR phosphorylation, and identify a repair complex consisting of AKAP12-ATR-pS435-XPA at photodamage, which is essential for cAMP-enhanced NER.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Jarrett SG,Wolf Horrell EM,D'Orazio JAdoi
10.1093/nar/gkw871subject
Has Abstractpub_date
2016-12-15 00:00:00pages
10711-10726issue
22eissn
0305-1048issn
1362-4962pii
gkw871journal_volume
44pub_type
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