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The cysteine content of poliovirus particles and naturally occuring empty capsids was determined by two methods: (1) reaction with vinylpyridine and subsequent amino acid analyses and (2) treatment with 5,5′-dithiobis-(2-nitrobenzoic acid) (DTNB) and measurement in the change of absorption. Both methods were performed under dissociating conditions in order to expose all sulfhydryl groups. Poliovirus, type 1, strain Mahoney, contains 10-11 cysteine/cystine residues per protomer, irrespective of the use of virus particles or empty capsids. Poliovirus, type 3, strain Saukett, contains 12-13 cysteine/cystine residues per protomer. Poliovirus particles are completely free of disulfide bridges, whereas empty capsids contain 2-4 cystine residues/protomer. No sulfhydryl groups are present on the surface of the virus particle, because of lack of reaction with DTNB.

zeitschrift für naturforschung c

Chemische Analyse und Struktur des Poliovirus. I. Cystein/Cystin Gehalt, vollständige Aminosäureanalyse und Hydrophobizität von Poliovirus und seinen natürlichen leeren Kapsiden / Chemical Analysis and Structure of Poliovirus. I. Cysteine/Cystine Content, Complete Amino Acid Analysis and Hydrophobicity of Poliovirus and Its Naturally Occurring Empty Capsids