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Regulation of chromatin organization and dynamics by INO80

INO80 对染色质组织和动力学的调节

基本信息

批准号：
10546440
负责人：
Blaine Bartholomew
金额：
$ 45.52万
依托单位：
UNIVERSITY OF TX MD ANDERSON CAN CTR
依托单位国家：
美国
项目类别：
财政年份：
2015
资助国家：
美国
起止时间：
2015-05-01 至 2024-12-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10546440
关键词：
3-Dimensional ATP phosphohydrolase ATPase Domain Affect Binding Biochemical Biological Assay Catalytic Domain Cells Centromere Chemicals Chromatin Chromosomes Communication Complex Coronary Coupling Cryoelectron Microscopy DNA DNA Crosslinking DNA Double Strand Break DNA Repair DNA Sequence DNA biosynthesis DNA-Protein Interaction Data Enhancers Formaldehyde Gatekeeping Gene Expression Genome Genomics Heterochromatin Histone H4 Histones Hot Spot Human Hydrolysis In Vitro Length Linker DNA Malignant Neoplasms Maps Mass Spectrum Analysis Measures Mediating Methods Molecular Molecular Conformation Motor Movement Mutate Mutation Nucleosome Core Particle Nucleosomes Outcome Positioning Attribute Promoter Regions Protein-Protein Interaction Map Publishing Recombinants Regulation Resolution Rest Role Series Sorting Specific qualifier value Specificity Structure Surface Testing Time Transcriptional Regulation Vascular Diseases Visualization Yeasts analog chromatin remodeling crosslink dimer experimental study human disease improved in vitro Assay in vivo innovation insight mutant promoter reconstitution telomere whole genome yeast genome

项目摘要

Summary We know very little about the mechanism of INO80, how it disrupts nucleosomes and the factors governing its activity. We will take detailed “snapshots” of INO80 during nucleosome remodeling to find how INO80 and nucleosomes are moved during remodeling. A series of orthogonal approaches will be used to arrest INO80 remodeling at distinct stages and examine conformational changes in the core nucleosome and INO80. We will build on our recent observations of the motor domain being engaged at the H2A-H2B interface and persistently displacing DNA from this surface to find why displacement occurs, the factors that control displacement and whether this displacement weakens the interactions of H2A or H2A.Z dimers with the rest of the histone octamer or otherwise disrupts the nucleosome structure. Based on the proximity of Arp5 to nucleosomal DNA, we will test the premise of Arp5 as the “gatekeeper” regulating DNA traversing through the center of nucleosomes with wild type INO80 and mutant Arp5 in which either its histone or nucleosome binding regions have been deleted or mutated. We will also test whether the Arp8 module regulates Arp5 interactions with the acidic pocket of nucleosomes or nucleosomal DNA and if communication between these two domains is mediated by the Ino80 catalytic subunit. INO80 will be arrested at different stages in remodeling by limiting DNA translocations to specified distances, arresting with non-hydrolyzable ATP analogs, limiting linker DNA length and mutation of Arp8 and Arp5. We will probe the role of DNA sequence in INO80 remodeling because we observed coupling of ATPase activity to nucleosome movement being dramatically affected by the DNA sequence of the core nucleosome. We will find as suggested in these experiments if INO80 interactions and conformation varies depending on the DNA sequence bound by nucleosomes. In order to better examine the importance of DNA sequence in a “native” context, we will use yeast chromatin reconstituted with recombinant histones and simultaneously examine the differences of INO80 binding and remodeling with many thousands of nucleosomes, each with a different DNA sequence. We will use our expertise of mapping protein-DNA interactions in these genomic assays to sort with high precision the interactions of the INO80 subunits along with nucleosome movement, composition and structural features at ~bp resolution to provide a detailed analysis of each of these nucleosomes in a time resolved manner when remodeled. This approach will provide more insights into the DNA sequence specificity of INO80 and if there are “hot spots” for mobilizing/ destabilizing nucleosomes or exchanging H2A.Z in the yeast genome that doesn’t require additional factors. To confirm if INO80 behaves the same in vivo as in our in vitro assays, we will transfer several of these approaches to yeast cells so that we can measure chromatin dynamics in vivo with the same resolution as in vitro. We will compare how mutations in Arp5 and Arp8 change nucleosome dynamics in vivo, the importance of genomic position, and other factors for INO80 remodeling not present in our yeast reconstituted chromatin.

总结

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

INO80 Chromatin Remodeler Facilitates Release of RNA Polymerase II from Chromatin for Ubiquitin-Mediated Proteasomal Degradation.

INO80 染色质重塑器促进 RNA 聚合酶 II 从染色质中释放，以实现泛素介导的蛋白酶体降解。

DOI：
10.1016/j.molcel.2015.10.028
发表时间：
2015-12-03
期刊：
Molecular cell
影响因子：
16
作者：
Lafon A;Taranum S;Pietrocola F;Dingli F;Loew D;Brahma S;Bartholomew B;Papamichos-Chronakis M
通讯作者：
Papamichos-Chronakis M

INO80 exchanges H2A.Z for H2A by translocating on DNA proximal to histone dimers.

DOI：
10.1038/ncomms15616
发表时间：
2017-06-12
期刊：
Nature communications
影响因子：
16.6
作者：
Brahma S;Udugama MI;Kim J;Hada A;Bhardwaj SK;Hailu SG;Lee TH;Bartholomew B
通讯作者：
Bartholomew B

The Arp8 and Arp4 module acts as a DNA sensor controlling INO80 chromatin remodeling.

DOI：
10.1038/s41467-018-05710-7
发表时间：
2018-08-17
期刊：
Nature communications
影响因子：
16.6
作者：
Brahma S;Ngubo M;Paul S;Udugama M;Bartholomew B
通讯作者：
Bartholomew B

New insights into the mechanism and DNA-sequence specificity of INO80 chromatin remodeling.

对 INO80 染色质重塑机制和 DNA 序列特异性的新见解。

DOI：
10.21203/rs.3.rs-3443329/v1
发表时间：
2023
期刊：
Research square
影响因子：
0
作者：
Bartholomew,Blaine;Shukla,Shagun;Ngubo,Mzwanele;Paul,Somnath;Persinger,Jim;Brahma,Sandipan
通讯作者：
Brahma,Sandipan