Reconstitution of human TFIIA activity from recombinant polypeptides: a role in TFIID-mediated transcription.

Abstract:

:Human TFIIA activity is composed of three subunits (alpha, beta, gamma). Here we report the isolation of a human cDNA clone encoding the gamma-subunit and the reconstitution of TFIIA activity from recombinant polypeptides (holo-TFIIA). Protein-protein interaction analysis established that the beta and gamma subunits of TFIIA interact with the TBP component of TFIID. The alpha-subunit is recruited into the complex by association with the gamma-subunit. Functional studies indicate that recombinant TFIIA stimulates basal TFIID-dependent transcription but is without effect on TBP-dependent transcription. Our studies indicate that TFIIA not only functions by physically removing negative components present in TFIID (antirepression), as demonstrated previously, but that it can stimulate basal transcription through components of the TFIID complex. Holo-TFIIA also stimulated activation of transcription in vitro as well as in vivo in transfected HeLa cells.

journal_name

Genes Dev

journal_title

Genes & development

authors

Sun X,Ma D,Sheldon M,Yeung K,Reinberg D

doi

10.1101/gad.8.19.2336

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

2336-48

issue

19

eissn

0890-9369

issn

1549-5477

journal_volume

8

pub_type

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