Solution structure of the C-terminal domain of TFIIH P44 subunit reveals a novel type of C4C4 ring domain involved in protein-protein interactions.Kellenberger, E., Dominguez, C., Fribourg, S., Wasielewski, E., Moras, D., Poterszman, A., Boelens, R., Kieffer, B.
(2005) J.Biol.Chem. 280: 20785-20792
- PubMed: 15790571
- DOI: 10.1074/jbc.M412999200
- PubMed Abstract:
- Structural characterization of the cysteine-rich domain of TFIIH p44 subunit
Fribourg, S.,Kellenberger, E.,Rogniaux, H.,Poterszman, A.,Van Dorsselaer, A.,Thierry, J.C.,Egly, J.M.,Moras, D.,Kieffer, B.
(2000) J.Biol.Chem. 275: 31963
The human general transcription factor TFIIH is involved in both transcription and DNA nucleotide excision repair. Among the 10 subunits of the complex, p44 subunit plays a crucial role in both mechanisms. Its N-terminal domain interacts with the XPD ...
The human general transcription factor TFIIH is involved in both transcription and DNA nucleotide excision repair. Among the 10 subunits of the complex, p44 subunit plays a crucial role in both mechanisms. Its N-terminal domain interacts with the XPD helicase, whereas its C-terminal domain is involved specifically in the promoter escape activity. By mutating an exposed and non-conserved cysteine residue into a serine, we produced a soluble mutant of p44-(321-395) suitable for solution structure determination. The domain adopts a C4C4 RING domain structure with sequential organization of beta-strands that is related to canonical RING domains by a circular permutation of the beta-sheet elements. Analysis of the molecular surface and mutagenesis experiments suggests that the binding of p44-(321-395) to TFIIH p34 subunit is not mediated by electrostatic interactions and, thus, differs from previously reported interaction mechanisms involving RING domains.
Département de Biologie et de Génomique Structurales, Institut de Génétique et de Biologie Moléculaire et Cellulaire UMR 7104, 1, rue Laurent Fries, BP 10142, 67404 Illkirch cedex, France.