Читать книгу Principles of Virology - Jane Flint, S. Jane Flint - Страница 274

Most viral mRNAs carry a 5′-terminal cap structure (exceptions include picornaviruses and the flavivirus hepatitis C virus), but the modification is made in different ways. Three mechanisms can be distinguished: acquisition of preformed 5′ cap structures from cellular pre-mRNAs or mRNAs as described above, de novo synthesis by cellular enzymes, or synthesis by viral enzymes. Details of the latter processes can be found in Chapter 8.