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The 20S proteasome of Streptomyces coelicolor.


ABSTRACT: 20S proteasomes were purified from Streptomyces coelicolor A3(2) and shown to be built from one alpha-type subunit (PrcA) and one beta-type subunit (PrcB). The enzyme displayed chymotrypsin-like activity on synthetic substrates and was sensitive to peptide aldehyde and peptide vinyl sulfone inhibitors and to the Streptomyces metabolite lactacystin. Characterization of the structural genes revealed an operon-like gene organization (prcBA) similar to Rhodococcus and Mycobacterium spp. and showed that the beta subunit is encoded with a 53-amino-acid propeptide which is removed during proteasome assembly. The upstream DNA region contains the conserved orf7 and an AAA ATPase gene (arc).

SUBMITTER: Nagy I 

PROVIDER: S-EPMC107596 | biostudies-literature | 1998 Oct

REPOSITORIES: biostudies-literature

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The 20S proteasome of Streptomyces coelicolor.

Nagy I I   Tamura T T   Vanderleyden J J   Baumeister W W   De Mot R R  

Journal of bacteriology 19981001 20


20S proteasomes were purified from Streptomyces coelicolor A3(2) and shown to be built from one alpha-type subunit (PrcA) and one beta-type subunit (PrcB). The enzyme displayed chymotrypsin-like activity on synthetic substrates and was sensitive to peptide aldehyde and peptide vinyl sulfone inhibitors and to the Streptomyces metabolite lactacystin. Characterization of the structural genes revealed an operon-like gene organization (prcBA) similar to Rhodococcus and Mycobacterium spp. and showed t  ...[more]

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