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ABSTRACT: Population genomic study of the patch-nosed salamander (Urspelerpes brucei)

PROVIDER: PRJNA838210 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19213934_1.fastq.gz	Fastqsanger.gz
	SRR19213934_2.fastq.gz	Fastqsanger.gz
	SRR19213935_1.fastq.gz	Fastqsanger.gz
	SRR19213935_2.fastq.gz	Fastqsanger.gz
	SRR19213936_1.fastq.gz	Fastqsanger.gz

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Project description:Eukaryotes have an array of diverse mechanisms for organising and using their genomes, but the histones that make up chromatin are highly conserved. Unusually, histones from Kinetoplastids are highly divergent. The structural and functional consequences of this variation are unknown. Here, we have biochemically characterised nucleosome core particles (NCPs) from the Kinetoplastid parasite Trypanosoma brucei. A structure of the T. brucei NCP reveals that global histone architecture is conserved, but specific sequence alterations lead to distinct DNA and protein interaction interfaces. The T. brucei NCP is unstable and has weakened DNA binding overall. However, dramatic changes at the H2A-H2B interface introduce local reinforcement of DNA contacts. The T. brucei acidic patch has altered topology and is refractory to known binders, indicating that the nature of chromatin interactions in T. brucei may be unique. Overall, our results provide a detailed molecular basis for understanding evolutionary divergence in chromatin structure.

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