Abstract

The optical rotatory dispersions of MS2 bacteriophage, its constituent RNA 1 1 Abbreviations used: RNA, ribonucleic acid; ORD, optical rotatory dispersion; OD, optical density; PGA, poly- l-glutamic acid; CD, circular dichroism. , and coat protein subunit are described, revealing little change in RNA secondary structure upon assembly. It is concluded that the unusual MS2 protein subunit rotatory dispersion probably reflects tertiary rather than secondary structure, and that this structure persists upon assembly. Analysis of heated bacteriophage revealed an increase in protein levorotation concomitant with splitting of the particles into degraded nucleic acid and protein shells.

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