The invention discloses an application of PA200 proteins in preparation of products. The products have at least one of the following functions from (1) to (4): (1) combining with acetylated proteins; (2) promoting the degradation of the acetylated proteins; (3) participating in repair of 
DNA (deoxyribonucleic acid) damages of somatic cells; and (4) participating in the formation of sperms. The invention has breakthroughs in four following aspects: (1) finding a mechanism of regulation and control of degradation of the histones, the 
sperm formation and the 
DNA repair by 
acetylation; (2) revealing the degradation of the histones medicated by 
acetylation rather than ubiquitination through PA200 / Blm10 
proteasome; (3) finding novel testis-specific 
proteasome containing PA200 and alpha 4s, and revealing the core histones as a first type biological substrate for the 
proteasome; and (4) revealing that a 
histone deacetylase inhibitor can promote the degradation of the histones which are induced by 
DNA double-strand breaks and medicated by 
acetylation, enhance the sensitivity of cells to DNA damages and easily lead to the death of the cells.