Profilin is required for optimal actin-dependent transcription of respiratory syncytial virus genome RNA

Emily Burke, Nicole M. Mahoney, Steven C. Almo, Sailen Barik

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Transcription of human respiratory syncytial virus (RSV) genome RNA exhibited an obligatory need for the host cytoskeletal protein actin. Optimal transcription, however, required the participation of another cellular protein that was characterized as profilin by a number of criteria. The amino acid sequence of the protein, purified on the basis of its transcription- optimizing activity in vitro, exactly matched that of profilin. RSV transcription was inhibited 60 to 80% by antiprofilin antibody or poly-L- proline, molecules that specifically bind profilin. Native profilin, purified from extracts of lung epithelial cells by affinity binding to a poly-L- proline matrix, stimulated the actin-saturated RSV transcription by 2.5- to 3-fold. Recombinant profilin, expressed in bacteria, stimulated viral transcription as effectively as the native protein and was also inhibited by poly-L-proline. Profilin alone, in the absence of actin, did not activate viral transcription. It is estimated that at optimal levels of transcription, every molecule of viral genomic RNA associates with approximately the following number of protein molecules: 30 molecules of L, 120 molecules of phosphoprotein P, and 60 molecules each of actin and profilin. Together, these results demonstrated for the first time a cardinal role for profilin, an actin-modulatory protein, in the transcription of a paramyxovirus RNA genome.

Original languageEnglish (US)
Pages (from-to)669-675
Number of pages7
JournalJournal of Virology
Volume74
Issue number2
DOIs
StatePublished - 2000

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Profilins
Respiratory Syncytial Viruses
actin
Actins
transcription (genetics)
Genome
RNA
viruses
genome
proline
Proteins
proteins
Human respiratory syncytial virus
Cytoskeletal Proteins
Respirovirus
profilins
cytoskeletal proteins
Phosphoproteins
Viral RNA
phosphoproteins

ASJC Scopus subject areas

  • Immunology

Cite this

Profilin is required for optimal actin-dependent transcription of respiratory syncytial virus genome RNA. / Burke, Emily; Mahoney, Nicole M.; Almo, Steven C.; Barik, Sailen.

In: Journal of Virology, Vol. 74, No. 2, 2000, p. 669-675.

Research output: Contribution to journalArticle

Burke, Emily ; Mahoney, Nicole M. ; Almo, Steven C. ; Barik, Sailen. / Profilin is required for optimal actin-dependent transcription of respiratory syncytial virus genome RNA. In: Journal of Virology. 2000 ; Vol. 74, No. 2. pp. 669-675.
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