Protein Synthesis in Plants

Abstract

Summary The final stages in the formation of protein, rather than the formation of amino‐acids, are discussed. The approach is physiological rather than biochemical. After reviewing the present state of knowledge of the structure of proteins various suggestions as to the substances used in the formation of the protein are considered. The evidence seems to be in favour of the formation by condensation of amino‐acids rather than by the polymerization of some simple unit. This leads to a consideration of the various seats of synthesis in the cell and to the mechanism by which the proteins are formed from their constituent parts. The article concludes with a discussion of the interrelation of nitrogen metabolism and respiration and of the factors governing amino‐acid formation and protein synthesis.

EFFECTS OF IRON ON CERTAIN NITROGENOUS FRACTIONS OF ANANAS COMOSUS (L.) MERR

“…recolubiliation of some of the amino acid residues by the synthesis of new peptide bonds in addition to the scission of peptide linkages from proteins. Bromelin (23) an1d PETRIE and AVOOD (24) claimn that, " a given relation of proteins to amino acids will hold only so lonog as the proportions between the individual amino acids remain constant; the relation will be different for every change in amino acid proportions. " They have based their statement on data which showed that eystine inreeased less rapidly than other amino acids when the total concentration increased.…”

Effects of Nitrogen on the Nitrogenous Fractions of Ananas comosus (L.) Merr.

“…However, the great complexity of factors alreadyknown (15,25) to be associated with protein synthesis or breakdown weakens PAECH 's hypothesis with respect to the effects of mass law action.…”

Nitrogen and Phosphorus Fractions, Respiration, and Structure of Normal and Crown Gall Tissues of Tomato

“…Thus it can only be stated that the association of these cellular components during the maturation phase of crown gall development parallels that found in other organisms. PETRIE (22) has reviewed the attempts to correlate protein synthesis in plants with changes in respiratory activity and concluded that, to date, these studies have not been marked with any great degree of success. Examinations of the curves relating to the changes in protein nitrogen of the tumorous tissue ( fig.…”