Amino Acid Synthesis from Glucose-U-24C in Glossina Morsitans

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Langley, P.A.
Moloo, S.K.
Balogun, R.A.
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Amino acid synthesis from glucose-U _HC was investigated in 2 day post-emergent and pregnant females of Glossina morsitans. This insect can synthesize alanine, aspartic acid, cystine, glutamic acid, glycine, proline, and serine from glucose. Arginine, histidine, hydroxyproline, isoleucine, leucine, lysine, methionine, phenylalanine, taurine, threonine, and valine showed no radioactivity and hence may be classified as nutritionally indispensable amino acids. Although tyrosine and hydroxyproline were not synthesized from glucose, they are at least partially dispensable nutrients for this insect because their synthesis from phenylalanine has been demonstrated. After the labelled glucose injection the highest radioactivity was recovered in the proline fraction. This is probably related to its role as an important energy reserve for flight. The radioactive amino acids recovered from females and from their offspring following glucose-U-lIC injection were similar to those recovered from younger females. Radioactivity was also detected in the expired CO2 and the excreta. The amino acids alanine, arginine, cystine, glycine, histidine, leucine/isoleucine, lysine, methionine. proline, and valine were identified in the excreta, of which arginine and histidine were in the largest amounts. Only excreted alanine, glycine, and proline showed radioactivity.
Journal Of Insect Physiology, 20, p. 1087-1813