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cUMP hydrolysis by PDE3B.

Jessica Ostermeyer1, Franziska Golly1, Volkhard Kaever2

  • 1Hannover Medical School, Institute of Pharmacology, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.

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Summary

Phosphodiesterase PDE3B efficiently hydrolyzes cyclic uridine monophosphate (cUMP) with low affinity, explaining previously observed cUMP-hydrolytic activity in rat adipose tissue. This study characterized PDE3B kinetics and binding for cUMP.

Keywords:
3T3-L1 cellsAdipocytesCyclic UMPPDE3BPhosphodiesterase

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Previous findings suggested phosphodiesterase PDE3B hydrolyzes cyclic uridine monophosphate (cUMP).
  • cUMP-hydrolytic activity was noted in rat adipose tissue nearly 50 years ago.
  • The specific enzyme responsible for this activity remained uncharacterized.

Purpose of the Study:

  • To characterize the enzyme kinetics of PDE3B-mediated cUMP hydrolysis.
  • To determine the binding mode of cUMP to PDE3B.
  • To analyze cUMP hydrolysis in adipocyte preparations.

Main Methods:

  • Quantification of cyclic nucleotide monophosphates (cNMPs) and nucleotide monophosphates (NMPs) using HPLC-coupled tandem mass spectrometry.
  • Determination of PDE3B expression via qPCR and Western blot.
  • Molecular docking studies utilizing the PDE3B crystal structure (PDB ID 1SO2).

Main Results:

  • PDE3B demonstrated significant hydrolysis of both cUMP (Km ≈ 550 μM, Vmax ≈ 76 μmol/min/mg) and cyclic adenosine monophosphate (cAMP) (Km ≈ 0.7 μM, Vmax ≈ 4.3 μmol/min/mg).
  • Hydrolysis was sensitive to milrinone, a selective PDE3 inhibitor (Ki for cUMP hydrolysis: 205 nM).
  • cUMP forms one hydrogen bond with PDE3B, while cAMP forms two; cCMP does not interact with PDE3B.
  • Adipocyte differentiation increased PDE3B mRNA levels, and PDE3B-expressing cells and rat adipose tissue exhibited milrinone-sensitive cUMP-hydrolytic activity.

Conclusions:

  • PDE3B functions as a low-affinity, high-velocity phosphodiesterase for cUMP.
  • The study identifies PDE3B as the likely enzyme responsible for the historically observed cUMP-hydrolyzing activity in rat adipose tissue.
  • These findings elucidate the role of PDE3B in cUMP metabolism within adipocytes.