Associated component of the proteasome that specifically recognizes acetylated histones and promotes ATP- and ubiquitin-independent degradation of core histones during spermatogenesis and DNA damage response. Recognizes and binds acetylated histones via its bromodomain-like (BRDL) region and activates the proteasome by opening the gated channel for substrate entry. Binds to the core proteasome via its C-terminus, which occupies the same binding sites as the proteasomal ATPases, opening the closed structure of the proteasome via an active gating mechanism. Component of the spermatoproteasome, a form of the proteasome specifically found in testis: binds to acetylated histones and promotes degradation of histones, thereby participating actively to the exchange of histones during spermatogenesis. Also involved in DNA damage response in somatic cells, by promoting degradation of histones following DNA double-strand breaks.
Background References
1. Blickwedehl J., Olejniczak S., Cummings R., Sarvaiya N., Mantilla A., Chanan-Khan A., Pandita T.K., Schmidt M., Thompson C.B., Bangia N. The proteasome activator PA200 regulates tumor cell responsiveness to glutamine and resistance to ionizing radiation. Mol. Cancer Res. 10:937-944(2012).
2. Blickwedehl J., Agarwal M., Seong C., Pandita R.K., Melendy T., Sung P., Pandita T.K., Bangia N. Role for proteasome activator PA200 and postglutamyl proteasome activity in genomic stability. Proc. Natl. Acad. Sci. U.S.A. 105:16165-16170(2008).
Western blot analysis of PSME4 on different lysates with Rabbit anti-PSME4 antibody (HA500375) at 1/500 dilution.
Lane 1: 293T cell lysate (10 µg/Lane) Lane 2: Hela cell lysate (10 µg/Lane) Lane 3: Jurkat cell lysate (10 µg/Lane) Lane 4: RAW264.7 cell lysate (10 µg/Lane) Lane 5: Rat skeletal muscle tissue lysate (20 µg/Lane)
Predicted band size: 211 kDa Observed band size: 211 kDa
Exposure time: 2 minutes;
6% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA500375) at 1/500 dilution was used in 5% NFDM/TBST at room temperature for 2 hours. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1:200,000 dilution was used for 1 hour at room temperature.
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