| Title | A thermosensitive mutant of HRV2 2A proteinase: evidence for direct cleavage of eIF4GI and eIF4GII. | ||
| Author | Liebig, Hans Dieter; Seipelt, Joachim; Vassilieva, Elena; Gradi, Alessandra; Kuechler, Ernst | ||
| Journal | FEBS Lett | Publication Year/Month | 2002-Jul |
| PMID | 12123803 | PMCID | -N/A- |
| Affiliation | 1.Institute of Medical Biochemistry, Division of Biochemistry, University of Vienna, Dr. Bohrgasse 9/3, 1030, Vienna, Austria. | ||
Infection of mammalian cells with picornaviruses like entero-, rhino-, and aphthoviruses leads to an inhibition of cap-dependent cellular protein synthesis by the cleavage of both translation initiation factors, eIF4GI and eIF4GII. In entero- and rhinovirus infection this cleavage process is mediated by the viral 2A proteinase (2A(pro)). In order to discriminate between a direct mode of eIF4G cleavage and an indirect cleavage via activation of a cellular proteinase, a thermosensitive 2A(pro) mutant (ts-2A(pro)) of human rhinovirus 2 was employed. Temperature shift experiments of cytoplasmic HeLa cell extracts incubated with ts-2A(pro) strongly support a direct mode of cleavage of eIF4GI and eIF4GII by the viral 2A(pro).