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. 2004 Jul 22;78(2):500–510. doi: 10.1016/0042-6822(77)90126-X

The RNA of human coronavirus OC-43

Gregory A Tannock a,b,1, John C Hierholzer a,b
PMCID: PMC7131760  PMID: 194396

Abstract

A homogeneous RNA complex with a sedimentation coefficient of 70 S and an apparent molecular weight of approximately 6.1 × 106 was released from purified 32P-labeled, mouse-brain-derived OC-43 virus after treatment with 1% sodium dodecyl sulfate (SDS) for 15 min at 23°. The complex was highly susceptible to heat, releasing 4 S RNA fragments at 37° and breaking down to fragments of 4–70 S at 60°; it was also degraded by centrifugation through dimethyl sulfoxide gradients. Unlike tobacco mosaic virus or Rous sarcoma virus RNA, OC-43 RNA prepared by extraction with phenol-SDS or phenol-chloroform degraded into a range of fragments with coefficients of 15–55 S; 4 S RNA was also present as a minor component. This suggests that (a) extensive nicking of a large RNA molecule has occurred during viral growth, due to ribonucleases which are inactivated during phenol extractions; (b) heterogeneity for OC-43 RNA is not due to internal ribonuclease activity and fragments are held together by noncovalent linkages much weaker than those present in the 70 S retroviral RNA complex, or by small proteins; or, most probably, (c) a combination of extensive nicking and weak noncovalent linkages results in the heterogeneous denaturation products.

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