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| {{STRUCTURE_1p3k| PDB=1p3k | SCENE= }} | | {{STRUCTURE_1p3k| PDB=1p3k | SCENE= }} |
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| '''Crystallographic Studies of Nucleosome Core Particles containing Histone 'Sin' Mutants'''
| | ===Crystallographic Studies of Nucleosome Core Particles containing Histone 'Sin' Mutants=== |
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| ==Overview==
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| Here we describe 11 crystal structures of nucleosome core particles containing individual point mutations in the structured regions of histones H3 and H4. The mutated residues are located at the two protein-DNA interfaces flanking the nucleosomal dyad. Five of the mutations partially restore the in vivo effects of SWI/SNF inactivation in yeast. We find that even nonconservative mutations of these residues (which exhibit a distinct phenotype in vivo) have only moderate effects on global nucleosome structure. Rather, local protein-DNA interactions are disrupted and weakened in a subtle and complex manner. The number of lost protein-DNA interactions correlates directly with an increased propensity of the histone octamer to reposition with respect to the DNA, and with an overall destabilization of the nucleosome. Thus, the disruption of only two to six of the approximately 120 direct histone-DNA interactions within the nucleosome has a pronounced effect on nucleosome mobility and stability. This has implications for our understanding of how these structures are made accessible to the transcription and replication machinery in vivo.
| | The line below this paragraph, {{ABSTRACT_PUBMED_14739929}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 14739929 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_14739929}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Protein/dna interaction]] | | [[Category: Protein/dna interaction]] |
| [[Category: Sin mutants,nucleosome core particle]] | | [[Category: Sin mutants,nucleosome core particle]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 04:38:25 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:28:12 2008'' |
