Biochemical Genetics

, Volume 15, Issue 1–2, pp 173–193 | Cite as

Pyrimidine biosynthesis in Serratia marcescens: Polypeptide interactions of three nonsequential enzymes

  • James R. Wild
  • William L. Belser


Orotidine-5′-monophosphate pyrophosphorylase (OMPppase, E.C. and orotidylate decarboxylase (OMPdecase, E.C. were purified from Serratia marcescens HY. These enzymes required physical association for maximal catalytic activities and formed a fragile complex with dihydroorotase (DHOase, E.C. OMPppase reversibly lost 50% of its activity upon separation from DHOase. The kinetic characteristics of OMPppase were modified by this separation. In the presence of DHOase, the Kms for PRPP and orotate were stoichiometric: 2.3×10−6m and 2.6×10−6m, respectively. Following separation, the Kms were significantly different: 1.3 × 10−6m for PRPP and 4.1×10−6m for orotate. OMPppase and OMPdecase could be reversibly separated by acrylamide gel electrophoresis, but the separation was accompanied by a loss of catalytic efficiency for both enzymes. DHOase readily associated into multiple molecular forms and could not be purified. The DHOase-OMPppase-OMPdecase interactions demonstrate that a weakly aggregated, multifunctional enzyme complex participates in the biosynthesis of pyrimidine nucleotides in S. marcescens. This unique association of nonsequential biosynthetic enzymes may represent a larger complex which provides a channeling or regulatory unit.

Key words

Serratia marcescens pyrimidine biosynthesis enzyme aggregation regulation bacteria 


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Copyright information

© Plenum Publishing Corporation 1977

Authors and Affiliations

  • James R. Wild
    • 1
  • William L. Belser
    • 1
  1. 1.Department of BiologyUniversity of CaliforniaRiverside

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