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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cloning and characterization of a cDNA encoding an A-kinase anchoring protein located in the centrosome, AKAP450.

A combination of protein kinase A type II (RII) overlay screening, database searches and PCR was used to identify a centrosomal A-kinase anchoring protein. A cDNA with an 11.7 kb open reading frame was characterized and found to correspond to 50 exons of genomic sequence on human chromosome 7q21-22. This cDNA clone encoded a 3908 amino acid protein of 453 kDa, that was designated AKAP450 (DDBJ/EMBL/GenBank accession No. AJ131693). Sequence comparison demonstrated that the open reading frame contained a previously characterized cDNA encoding Yotiao, as well as the human homologue of AKAP120. Numerous coiled-coil structures were predicted from AKAP450, and weak homology to pericentrin, giantin and other structural proteins was observed. A putative RII-binding site was identified involving amino acid 2556 of AKAP450 by mutation analysis combined with RII overlay and an amphipatic helix was predicted in this region. Immunoprecipitation of RII from RIPA-buffer extracts of HeLa cells demonstrated co-precipitation of AKAP450. By immunofluorecent labeling with specific antibodies it was demonstrated that AKAP450 localized to centrosomes. Furthermore, AKAP450 was shown to co-purify in centrosomal preparations. The observation of two mRNAs and several splice products suggests additional functions for the AKAP450 gene.[1]


  1. Cloning and characterization of a cDNA encoding an A-kinase anchoring protein located in the centrosome, AKAP450. Witczak, O., Skålhegg, B.S., Keryer, G., Bornens, M., Taskén, K., Jahnsen, T., Orstavik, S. EMBO J. (1999) [Pubmed]
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