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Abstract
High mobility group (HMG) proteins are chromatin proteins endowed with 'architectural'
capabilities. HMGA proteins are moderately sequence-specific, and help build enhanceosomes
by interacting with partner proteins and binding stably to the minor groove of DNA;
their acetylation/deacetylation signal enhanceosome assembly or disassembly. HMGBs
are much more dynamic proteins: they have no sequence specificity, and help transcription
factors and other nuclear proteins bind to their cognate sites by bending the DNA
molecule. However, HMGBs are rarely retained within the complex. Similarly, HMGBs
interact with nucleosomes and promote their sliding, but remain bound only for fractions
of a second. We argue that HMGBs fluidize chromatin - an action that appears opposite
to that of histone H1.