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  • Title: A quantity control mechanism regulating levels of the HapE subunit of the Hap complex in Aspergillus nidulans: no accumulation of HapE in hapC deletion mutants.
    Author: Kato M, Tateyama Y, Hayashi K, Naruse F, Oonishi R, Tanoue S, Tanaka A, Kobayashi T, Tsukagoshi N.
    Journal: FEBS Lett; 2002 Feb 13; 512(1-3):227-9. PubMed ID: 11852085.
    Abstract:
    The Aspergillus nidulans CCAAT-binding complex (Hap complex) consists of at least three subunits, HapB, HapC and HapE. To investigate the quantity control mechanisms of the subunits during assembly of the Hap complex, reconstitution studies with the recombinant subunits and extracts prepared from the respective hap subunit deletion mutants were carried out. Furthermore, Western blot analysis of the Hap subunits and Northern blot analysis of the hap genes with the respective deletion mutants were also performed. From all the results together, it was suggested that the number of the HapC molecule could adjust that of the HapE molecule by forming stable heterodimers prior to assembly of the Hap complex.
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