Jan 15, 1976

Circular-dichroism and absorption spectroscopic studies on specific aromatic residues involved in the different modes of aggregation of tobacco-mosaic-virus protein

European Journal of Biochemistry
D Vogel, R Jaenicke


Conformational changes accompanying the different modes of aggregation of tobacco mosaic virus protein (TMV-protein) were investigated using circular dichroism (CD) and absorption difference spectra in the range of aromatic absorption. Comparing wild-type protein and mutant Ni 2068 (Tyr-139 leads to Cys-139) a tentative localization of aromatic amino acids in the three-dimensional structure is rendered possible. In all modes of aggregation the CD spectra are determined by intrasubunit interactions between aromatic residues, in particular Trp-17 and Trp-52 as well as Tyr-70, Tyr-72 and Tyr-139. The Trp-17-Trp-52 interaction was found to be highly sensitive towards changes of the quaternary structure especially with respect to helical aggregates. This suggests that the environment of the two tryptophan residues is of crucial importance in the three-dimensional structure of the subunit; in the course of aggregation intersubunit interactions compete with the specific intrasubunit Trp-17--Trp52 interactions. It is suggested that Try-70 and Tyr-72 form hydrogen bonds in a strongly hydrophobic environment. Formation of the double disc decreases the rotatory strength, pointing to an increase in conformational flexibility. Spectroscopic...Continue Reading

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Mentioned in this Paper

Viral Proteins
Plasma Protein Binding Capacity
Protein Conformation
Spectrophotometry, Ultraviolet
Tobacco Mosaic Virus
Circular Dichroism, Vibrational
Hydrogen-Ion Concentration
Computers, Digital

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