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© Research
Publication : Journal of agricultural and food chemistry

Grafting of aliphatic and aromatic probes on rapeseed 2S and 12S proteins: influence on their structural and physicochemical properties

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of agricultural and food chemistry - 01 Dec 1999

Gerbanowski A, Malabat C, Rabiller C, Guéguen J

Link to Pubmed [PMID] – 10606599

J. Agric. Food Chem. 1999 Dec;47(12):5218-26

Lysyl residues of rapeseed napin (2S) and cruciferin (12S) were acylated and sulfamidated by means of anhydrides and sulfonyl chlorides, respectively. The secondary and tertiary structures as well as the surface hydrophobicity of the modified proteins were studied using circular dichroism, intrinsic fluorescence, and binding of anilinonaphthalenesulfonic acid. The results showed clearly that grafting of hydrophobic chains induced different structural modifications and surface hydrophobicities on the monomeric (2S) and on the hexameric (12S) proteins. Thus, the original structure of the 2S modified protein seemed to be preserved. Therefore, the surface hydrophobicity increased proportionally with the number of groups grafted. Conversely, after modification, 12S was shown to be expanded. As a result, hydrophobic regions were exposed, leading to a much greater hydrophobization of the protein surface. Acylation and sulfamidation appeared, therefore, to be good methods to hydrophobize efficiently the surface of the two proteins and thus might probably induce new functional properties.

http://www.ncbi.nlm.nih.gov/pubmed/10606599