Advertisement

Topics

Boundaries of eliminated heterochromatin of Tetrahymena are positioned by the DNA-binding protein Ltl1.

08:00 EDT 13th June 2019 | BioPortfolio

Summary of "Boundaries of eliminated heterochromatin of Tetrahymena are positioned by the DNA-binding protein Ltl1."

During differentiation of the Tetrahymena thermophila somatic nucleus, its germline-derived DNA undergoes extensive reorganization including the removal of ∼50 Mb from thousands of loci called internal eliminated sequences (IESs). IES-associated chromatin is methylated on lysines 9 and 27 of histone H3, marking newly formed heterochromatin for elimination. To ensure that this reorganized genome maintains essential coding and regulatory sequences, the boundaries of IESs must be accurately defined. In this study, we show that the developmentally expressed protein encoded by Lia3-Like 1 (LTL1) (Ttherm_00499370) is necessary to direct the excision boundaries of particular IESs. In ΔLTL1 cells, boundaries of eliminated loci are aberrant and heterogeneous. The IESs regulated by Ltl1 are distinct from those regulated by the guanine-quadruplex binding Lia3 protein. Ltl1 has a general affinity for double stranded DNA (Kd ∼ 350 nM) and binds specifically to a 50 bp A+T rich sequence flanking each side of the D IES (Kd ∼ 43 nM). Together these data reveal that Ltl1 and Lia3 control different subsets of IESs and that their mechanisms for flanking sequence recognition are distinct.

Affiliation

Journal Details

This article was published in the following journal.

Name: Nucleic acids research
ISSN: 1362-4962
Pages:

Links

DeepDyve research library

PubMed Articles [13933 Associated PubMed Articles listed on BioPortfolio]

An RNA aptamer to HP1/Swi6 facilitates heterochromatin formation at an ectopic locus in S.pombe.

In the fission yeast Schizosaccharomyces pombe (S.pombe), heterochromatin domains are established and maintained by protein complexes that contain numerous RNA binding domains among their components. ...

Topoisomerase 3β interacts with RNAi machinery to promote heterochromatin formation and transcriptional silencing in Drosophila.

Topoisomerases solve topological problems during DNA metabolism, but whether they participate in RNA metabolism remains unclear. Top3β represents a family of topoisomerases carrying activities for bo...

One-step production of bioactive human lipopolysaccharide binding protein from LPS-eliminated E. coli.

Human lipopolysaccharide (LPS) binding protein (LBP) is a ∼60 kDa glycosylated protein that mediates potent innate immune against invading Gram-negative bacteria by recognition of LPS in their out...

Mitotic phosphorylation of HP1α regulates its cell cycle-dependent chromatin binding.

Heterochromatin protein 1 (HP1) is an evolutionarily conserved chromosomal protein that plays a crucial role in heterochromatin-mediated gene silencing. We previously showed that mammalian HP1α is co...

A deep neural network approach for learning intrinsic protein-RNA binding preferences.

The complexes formed by binding of proteins to RNAs play key roles in many biological processes, such as splicing, gene expression regulation, translation and viral replication. Understanding protein-...

Clinical Trials [3093 Associated Clinical Trials listed on BioPortfolio]

Study of the Role of Soluble Inhibitor of Interleukin 22, Interleukin 22 Binding Protein (IL-22BP), in Chronic Inflammatory Bowel Disease

IL-22 is an IL-10 family cytokine that plays major actions to increase intestinal epithelial barrier function and regeneration during experimental colitis. IL-22 binding protein is a small...

Assessment of Heparin Binding Protein for the Prediction of Severe Sepsis

The purpose of this prospective, non-interventional, multi-centre clinical study is to assess the clinical validity of the Heparin Binding Protein (HBP) assay for indicating the presence, ...

Heparin Binding Protein in Early Sepsis Diagnosis

The primary objective of this study is to use heparin-binding protein (HBP) concentration to indicate the presence, or outcome, of sepsis over 72 hours after ED admission. The secondary ob...

Comparison of Ertapenem Distribution in the Muscle of Six Healthy Volunteers and Six Critically Ill Patients by Microdialysis

Ertapenem is an antibiotic that is highly bound to plasma protein (> 95%). The effects of this high protein binding on tissue distribution of antibiotics have been few evaluated yet. In t...

Lipopolysaccharide Binding Protein and Development of Infectious Events in Cirrhotic Patients

The purpose of this study is to determine whether plasma levels of lipopolysaccharide binding protein (LBP) are correlated with PBMN pro- and anti-inflammatory cytokine secretion, as well ...

Medical and Biotech [MESH] Definitions

GTP-BINDING PROTEINS that contain three non-identical subunits. They are found associated with members of the seven transmembrane domain superfamily of G-PROTEIN-COUPLED RECEPTORS. Upon activation the GTP-BINDING PROTEIN ALPHA SUBUNIT of the complex dissociates leaving a dimer of a GTP-BINDING PROTEIN BETA SUBUNIT bound to a GTP-BINDING PROTEIN GAMMA SUBUNIT.

A poly(A) binding protein that has a variety of functions such as mRNA stabilization and protection of RNA from nuclease activity. Although poly(A) binding protein I is considered a major cytoplasmic RNA-binding protein it is also found in the CELL NUCLEUS and may be involved in transport of mRNP particles.

A member of the p300-CBP transcription factor family that was initially identified as a binding partner for CAMP RESPONSE ELEMENT-BINDING PROTEIN. Mutations in CREB-binding protein are associated with RUBINSTEIN-TAYBI SYNDROME.

The major sequence-specific DNA-binding component involved in the activation of transcription of RNA POLYMERASE II. It was originally described as a complex of TATA-BOX BINDING PROTEIN and TATA-BINDING PROTEIN ASSOCIATED FACTORS. It is now know that TATA BOX BINDING PROTEIN-LIKE PROTEINS may take the place of TATA-box binding protein in the complex.

A class of proteins related in structure and function to TATA-BOX BINDING PROTEIN that can take the place of TATA-BOX BINDING PROTEIN in the transcription initiation complex. They are found in most multicellular organisms and may be involved in tissue-specific promoter regulation. They bind to DNA and interact with TATA-BINDING PROTEIN ASSOCIATED FACTORS, however they may lack specificity for the TATA-BOX.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topics

Bioinformatics
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...

Nutrition
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...


Searches Linking to this Article