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. 1996 May;70(5):3319–3324. doi: 10.1128/jvi.70.5.3319-3324.1996

Hybrid proteins between Pseudomonas aeruginosa exotoxin A and poliovirus 2Apro cleave p220 in HeLa cells.

I Novoa 1, M Cotten 1, L Carrasco 1
PMCID: PMC190201  PMID: 8627818

Abstract

Cleavage of p220, a component of the initiation factor eIF-4F, has been correlated with the inhibition of host translation during poliovirus infection. To obtain p220 cleavage in the absence of any other poliovirus gene products, hybrid proteins containing Pseudomonas aeruginosa exotoxin A and poliovirus protease 2Apro have been constructed. The addition of the hybrid molecules to cultured cells did not lead to substantial p220 cleavage. However, the simultaneous presence of the hybrid toxin with replicationally inactive chicken adenovirus particles results in efficient cleavage of p220 in the intact cells. Under these conditions, cellular translation continues unabated for several hours, arguing against a direct requirement for intact p220 in each round of the initiation of translation of cellular mRNAs.

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Selected References

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