2qfj
From Proteopedia
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'''Crystal Structure of First Two RRM Domains of FIR Bound to ssDNA from a Portion of FUSE''' | '''Crystal Structure of First Two RRM Domains of FIR Bound to ssDNA from a Portion of FUSE''' | ||
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[[Category: Lolis, E.]] | [[Category: Lolis, E.]] | ||
[[Category: Yang, Y.]] | [[Category: Yang, Y.]] | ||
| - | [[Category: | + | [[Category: Protein-dna complex]] |
| - | [[Category: | + | [[Category: Rrm domain]] |
| - | [[Category: | + | [[Category: Transcription repressor/dna complex]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 14:52:39 2008'' | |
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Revision as of 11:52, 4 May 2008
Crystal Structure of First Two RRM Domains of FIR Bound to ssDNA from a Portion of FUSE
Overview
c-myc is essential for cell homeostasis and growth but lethal if improperly regulated. Transcription of this oncogene is governed by the counterbalancing forces of two proteins on TFIIH--the FUSE binding protein (FBP) and the FBP-interacting repressor (FIR). FBP and FIR recognize single-stranded DNA upstream of the P1 promoter, known as FUSE, and influence transcription by oppositely regulating TFIIH at the promoter site. Size exclusion chromatography coupled with light scattering reveals that an FIR dimer binds one molecule of single-stranded DNA. The crystal structure confirms that FIR binds FUSE as a dimer, and only the N-terminal RRM domain participates in nucleic acid recognition. Site-directed mutations of conserved residues in the first RRM domain reduce FIR's affinity for FUSE, while analogous mutations in the second RRM domain either destabilize the protein or have no effect on DNA binding. Oppositely oriented DNA on parallel binding sites of the FIR dimer results in spooling of a single strand of bound DNA, and suggests a mechanism for c-myc transcriptional control.
About this Structure
2QFJ is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Dimerization of FIR upon FUSE DNA binding suggests a mechanism of c-myc inhibition., Crichlow GV, Zhou H, Hsiao HH, Frederick KB, Debrosse M, Yang Y, Folta-Stogniew EJ, Chung HJ, Fan C, De la Cruz EM, Levens D, Lolis E, Braddock D, EMBO J. 2008 Jan 9;27(1):277-89. Epub 2007 Dec 6. PMID:18059478 Page seeded by OCA on Sun May 4 14:52:39 2008
