Experientia

, Volume 48, Issue 8, pp 729–731

Presence of a partial urea cycle in the leech,Poecilobdella granulosa

  • S. Natesan
  • B. Jayasundaramma
  • R. Ramamurthi
  • S. R. R. Reddy
Research Articles

Abstract

Ornithine carbamoyltransferase (OCT) and arginase, but not arginine synthetase (AS), were detected in the body wall and gut tissues of the leech. The activities of these enzymes were not altered by starvation. The high activity of arginase in body wall is probably due to the association of the latter with botryoidal tissue. Hirudineans, which evolved from oligochaete ancestors, appear to have lost the citrulline-arginine segment of the urea cycle due to their ammonotelic mode of nitrogen excretion.

Key words

Urea cycle leech botryoidal tissue hirudineans evolution 

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Copyright information

© Birkhäuser Verlag 1992

Authors and Affiliations

  • S. Natesan
    • 1
  • B. Jayasundaramma
    • 2
  • R. Ramamurthi
    • 2
  • S. R. R. Reddy
    • 1
  1. 1.Department of ZoologyUniversity of PoonaPuneIndia
  2. 2.Department of ZoologySri Venkateswara UniversityTirupatiIndia
  3. 3.Department of MedicineUMDNJ-New Jersey Medical SchoolNewarkUSA

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