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Metabolic sources of ammonia in the earthworm,Lumbricus terrestris L

✍ Scribed by MacDonnell, Paul C. ;Tillinghast, Edward K.

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
530 KB
Volume
185
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The earthworm Lumbricus terrestris is ammonotelic while feeding but becomes ureotelic with fasting.

The metabolic sources of ammonia nitrogen in feeding worms have been examined. Two deaminating enzymes, L‐serine dehydratase and 5′‐AMP deaminase, have been observed to be present in high activity. The latter enzyme was an order of magnitude more active than the former.

The activity of L‐serine dehydratase was modified by theophylline but not by cyclic AMP.

5′‐AMP deaminase appears to be an allosteric enzyme with ATP functioning as a positive modulator. The positive allosteric effector increases the apparent affinity of 5′‐AMP deaminase for its substrate while having no effect on the maximum velocity of the reaction.

Both enzymes were located predominantly in the gut tissue.

While neither enzyme decreased in activity with fasting their possible role in ammonia production is discussed.

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