Source:http://linkedlifedata.com/resource/pubmed/id/12223483
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| rdf:type | |
| lifeskim:mentions | |
| pubmed:dateCreated |
2002-11-18
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| pubmed:abstractText |
AMY-1 has been identified by us as a c-Myc-binding protein and was found to stimulate c-Myc transcription activity. AMY-1 was also found to be associated with protein kinase A anchor protein 84/149 (S-AKAP84/AKAP149) in the mitochondria in somatic cells and sperm, suggesting that it plays a role in spermatogenesis. To determine the molecular function of AMY-1, a two-hybrid screening of cDNAs encoding AMY-1-binding proteins was carried out with AMY-1 as a bait using a human testis cDNA library, and a clone encoding a novel protein, AAT-1, was obtained. Three isoforms of AAT-1, AAT-1alpha, -beta, and -gamma, were found to be derived from an alternative splicing of the transcripts of the aat-1 gene, which was mapped at human chromosome 3q13-3q21. AAT-1 was found to be specifically expressed in the testis during the course of spermatogenesis and also to be present in the spermatid and mature sperm, as was AMY-1. AAT-1alpha was found to bind to and be colocalized in mitochondria with AMY-1 in human HeLa and mouse GC-1 cells. Furthermore, AAT-1alpha was found to bind to the N-terminal half of S-AKAP84/AKAP149 in a quaternary complex with AMY-1 and a regulatory subunit (RII) of cAMP-dependent kinase (PKA), in which AAT-1alpha was associated with RII via S-AKAP84/AKAP149, in rat testis and HeLa cells. It was then found that AAT-1alpha weakly stimulated a phosphorylation activity of PKA and also that AAT-1 itself was phosphorylated by PKA in vivo and in vitro. These results suggest that both AAT-1 and AMY-1 play roles in spermatogenesis.
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| pubmed:language |
eng
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| pubmed:citationSubset |
IM
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| pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/A Kinase Anchor Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/AKAP1 protein, human,
http://linkedlifedata.com/resource/pubmed/chemical/Adaptor Proteins, Signal Transducing,
http://linkedlifedata.com/resource/pubmed/chemical/Akap1 protein, mouse,
http://linkedlifedata.com/resource/pubmed/chemical/Akap1 protein, rat,
http://linkedlifedata.com/resource/pubmed/chemical/Amy1 protein, mouse,
http://linkedlifedata.com/resource/pubmed/chemical/Carrier Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Cyclic AMP-Dependent Protein Kinases,
http://linkedlifedata.com/resource/pubmed/chemical/DNA-Binding Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/MYCBP protein, human,
http://linkedlifedata.com/resource/pubmed/chemical/Macromolecular Substances,
http://linkedlifedata.com/resource/pubmed/chemical/Membrane Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Protein Subunits,
http://linkedlifedata.com/resource/pubmed/chemical/Recombinant Fusion Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Salivary alpha-Amylases,
http://linkedlifedata.com/resource/pubmed/chemical/Transcription Factors
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| pubmed:status |
MEDLINE
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| pubmed:author | |
| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
45480-92
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| pubmed:dateRevised |
2009-11-19
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| pubmed:articleTitle |
AAT-1, a novel testis-specific AMY-1-binding protein, forms a quaternary complex with AMY-1, A-kinase anchor protein 84, and a regulatory subunit of cAMP-dependent protein kinase and is phosphorylated by its kinase.
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| pubmed:affiliation |
Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo 060-0812, Japan.
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