Protein in senescent leaves of Trifolium subterraneum: partial amino-acid composition
- 1 January 1948
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 42 (3) , 412-414
- https://doi.org/10.1042/bj0420412
Abstract
The amide, tyrosine, tryptophan, cyst(e)ine methionine, arginine, histidine and lysine contents of protein prepns. from senescent leaves of T. subterraneum, expressed as percentages of the protein N occurring in these forms, were found to be 5.39-5.71,2.8-2.9, 1.65-1.85, 1.42-1.47, 1.02-1.13, 13.5, 4.26 and 5.72, respectively. From comparison of these values with those previously found for non-senescent material (arginine, histidine and lysine values were not available) and from other considerations, it has been concluded tentatively that the onset of senescence was accompained by an increase in the cyst(e)ine and possibly in the tyrosine content, and a decrease in the methionine content of the whole protein in the tissues.This publication has 12 references indexed in Scilit:
- Large-scale extraction of protein samples reasonably representative of the whole proteins in the leaves of some plants: the amide, tyrosine, tryptophan, cystine (plus cysteine) and methionine contents of the preparationsBiochemical Journal, 1944
- Further studies of cryptogam tissue proteins: protein composition and tissue function in plantsBiochemical Journal, 1943
- Protein metabolism in seed germinationBiochemical Journal, 1941
- The cystine and methionine in certain species of grassland herbageBiochemical Journal, 1941
- The basic amino-acids of leaf proteins. With a discussion of various methods of analysisBiochemical Journal, 1939
- The representativeness of extracted samples and the efficiency of extraction of protein from the fresh leaves of plants; and some partial analyses of the whole proteins of leavesBiochemical Journal, 1939
- Preparation of some protein samples from the fresh leaves of plants and the sulphur distributions of the preparationsBiochemical Journal, 1938
- The amide, tyrosine and tryptophan contents and the sulphur distributions (cystine plus cysteine and methionine contents), of some plant leaf protein preparationsBiochemical Journal, 1938
- Investigations of sources of error in the estimation of tyrosine and tryptophan in complex materials, which are associated with hydrolysisBiochemical Journal, 1938
- On the use of mercuric salts and nitrous acid in the colorimetric determination of tyrosine and tryptophan present in solutionBiochemical Journal, 1937