These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Nonspecific inhibition of Escherichia coli ornithine decarboxylase by various ribosomal proteins: detection of a new ribosomal protein possessing strong antizyme activity.
    Author: Kashiwagi K, Igarashi K.
    Journal: Biochim Biophys Acta; 1987 Jan 30; 911(2):180-90. PubMed ID: 3542048.
    Abstract:
    Escherichia coli ornithine decarboxylase (L-ornithine carboxy-lyase, EC 4.1.1.17) was found to be inhibited by several basic proteins. When ribosomal proteins were tested, major ribosomal proteins, with the exceptions of S1, S5, S6, S8, S10, L3, L5, L6, L7/L12, L8, L9 and L10 proteins, showed antizyme activity in addition to the recognized antizymes (S20/L26 and L34 proteins). Furthermore, it was found that L20 protein and a new ribosomal protein, tentatively named X1 protein and bound to 50 S ribosomal subunits, showed stronger antizyme activity than S20/L26 and L34 proteins. The antizyme activity of S20/L26 and L34 proteins was at most 10% of the total antizyme activity of ribosomal proteins. Several basic polypeptides also showed antizyme activity in the order polyarginine greater than protamine greater than histone greater than polylysine. Ribosomal proteins and basic polypeptides inhibited ornithine decarboxylase activity competitively. Ribosome-bound antizymes were inactive as antizymes, and antizyme inhibition of ornithine decarboxylase was eliminated by ribosomes. When E. coli extracts were separated into ribosomes and 100,000 X g supernatant fraction, no significant antizyme activity was observed in the supernatant fraction. Results of these in vitro experiments infer that basic antizymes may not function as inhibitors of ornithine decarboxylase in vivo.
    [Abstract] [Full Text] [Related] [New Search]