Multivalency regulates activity in an intrinsically disordered transcription factor

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Authors	CLARK S. MYERS J.B. KING A. FIALA Radovan NOVÁČEK Jiří PEARCE G. HEIERHORST J. REICHOW S.L. BARBAR E.J.
Year of publication	2018
Type	Article in Periodical
Magazine / Source	elife
MU Faculty or unit	Central European Institute of Technology
Citation
Doi	http://dx.doi.org/10.7554/eLife.36258
Keywords	DYNEIN LIGHT-CHAIN; BINDING PROTEIN CBP; C-TERMINAL DOMAIN; MULTISITE PHOSPHORYLATION; UNSTRUCTURED REGION; DNA-BINDING; LC8; COMPLEX; DYNLL1; ASCIZ
Description	The transcription factor ASCIZ (ATMIN, ZNF822) has an unusually high number of recognition motifs for the product of its main target gene, the hub protein LC8 (DYNLL1). Using a combination of biophysical methods, structural analysis by NMR and electron microscopy, and cellular transcription assays, we developed a model that proposes a concerted role of intrinsic disorder and multiple LC8 binding events in regulating LC8 transcription. We demonstrate that the long intrinsically disordered C -terminal domain of ASCIZ binds LC8 to form a dynamic ensemble of complexes with a gradient of transcriptional activity that is inversely proportional to LC8 occupancy. The preference for low occupancy complexes at saturating LC8 concentrations with both human and Drosophila ASCIZ indicates that negative cooperativity is an important feature of ASCIZ-LC8 interactions. The prevalence of intrinsic disorder and multivalency among transcription factors suggests that formation of heterogeneous, dynamic complexes is a widespread mechanism for tuning transcriptional regulation.
Related projects:	iNEXT - Infrastructure for NMR, EM and X-ray crystallography for translational research