Cellular content of ubiquitin and formation of ubiquitin conjugates during chicken spermatogenesis - PubMed (original) (raw)

Cellular content of ubiquitin and formation of ubiquitin conjugates during chicken spermatogenesis

N Agell et al. Biochem J. 1988.

Abstract

Ubiquitin was purified from chicken testis and its content, biosynthesis and formation of conjugates was determined in germinal cells at successive stages of spermatogenesis. Free ubiquitin increased markedly during spermatogenesis, reaching its maximum level in early spermatids. High levels of ubiquitin were still present in late spermatids but were not detectable in mature spermatozoa. Biosynthesis of ubiquitin occurred in vitro in a fraction containing meiotic and pre-meiotic cells, and during spermiogenesis, in early and late spermatids. The cellular content of free ubiquitin increased after ATP depletion, especially in early spermatids. Lysates of chicken testis cells, particularly those obtained from spermatids, were able to form nuclear (24 and 27 kDa) and extranuclear (55-90 kDa) ubiquitin conjugates in vitro. The presence of increasing levels of ubiquitin and ubiquitin conjugates in chicken spermatids may suggest a possible involvement of this protein in the marked changes of protein turnover, chromatin structure and cell-cell interactions that spermatids undergo during spermiogenesis.

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