NF-Y recruitment of TFIID, multiple interactions with histone fold TAF(II)s

Mattia Frontini (1) , Carol Imbriano (1) , Alberto Disilvio (1) , Brendan Bell (2) , Alessia Bogni (1) , Christophe Romier (2) , Dino Moras (2) , Làszlò Tora (2) , Irwin Davidson (2) , Roberto Mantovani (1)

1 UNIMORE - Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia
2 IGBMC - Institut de génétique et biologie moléculaire et cellulaire

The nuclear factor y (NF-Y) trimer and TFIID contain histone fold subunits, and their binding to the CCAAT and Initiator elements of the major histocompatibility complex class II Ea promoter is required for transcriptional activation. Using agarose-electrophoretic mobility shift assay we found that NF-Y increases the affinity of holo-TFIID for Ea in a CCAAT- and Inr-dependent manner. We began to dissect the interplay between NF-Y- and TBP-associated factors PO1II (TAF(II)s)-containing histone fold domains in protein-protein interactions and transfections. hTAF(II)20, hTAF(II)28, and hTAF(II)18-hTAF(II)28 bind to the NF-Y B-NF-YC histone fold dimer; hTAF(II)80 and hTAF(II)31-hTAF(II)80 interact with the trimer but not with the NF-YB-NF-YC dimer. The histone fold alpha2 helix of hTAF(II)80 is not required for NF-Y association, as determined by interactions with the naturally occurring splice variant hTAF(II)80 delta. Expression of hTAF(II)28 and hTAF(II)18 in mouse cells significantly and specifically reduced NF-Y activation in GAL4-based experiments, whereas hTAF(II)20 and hTAF(II)135 increased it. These results indicate that NF-Y (i) recruits purified holo-TFIID in vitro and (ii) can associate multiple TAF(II)s, potentially accommodating different core promoter architectures.

Domaines: Biochimie, Biologie Moléculaire

Mattia Frontini, Carol Imbriano, Alberto Disilvio, Brendan Bell, Alessia Bogni, et al.. NF-Y recruitment of TFIID, multiple interactions with histone fold TAF(II)s. Journal of Biological Chemistry, 2002, 277 (8), pp.5841-5848. ⟨10.1074/jbc.M103651200⟩. ⟨hal-04146335⟩