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Structural and functional analyses of the mammalian TIN2-TPP1-TRF2 telomeric complex
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Structural and functional analyses of the mammalian TIN2-TPP1-TRF2 telomeric complex
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Structural and functional analyses of the mammalian TIN2-TPP1-TRF2 telomeric complex
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Journal Article
Structural and functional analyses of the mammalian TIN2-TPP1-TRF2 telomeric complex
2017
Overview
Telomeres are nucleoprotein complexes that play essential roles in protecting chromosome ends. Mammalian telomeres consist of repetitive DNA sequences bound by the shelterin complex. In this complex, the POT1-TPP1 heterodimer binds to single-stranded telomeric DNAs, while TRF1 and TRF2-RAP1 interact with double-stranded telomeric DNAs. TIN2, the linchpin of this complex, simultaneously interacts with TRF1, TRF2, and TPP1 to mediate the stable assembly of the shelterin complex. However, the molecular mechanism by which TIN2 interacts with these proteins to orchestrate telomere protection remains poorly understood. Here, we report the crystal structure of the N-terminal domain of TIN2 in complex with TIN2-binding motifs from TPP1 and TRF2, revealing how TIN2 interacts cooperatively with TPP1 and TRF2. Unexpectedly, TIN2 contains a telomeric repeat factor homology （TRFH）-Iike domain that functions as a protein-protein interaction platform. plays an important role in maintaining the stable shelterin Structure-based mutagenesis analyses suggest that TIN2 complex required for proper telomere end protection.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Animals
/ Biomedical and Life Sciences
/ Dipeptidyl-Peptidases and Tripeptidyl-Peptidases - chemistry
/ Dipeptidyl-Peptidases and Tripeptidyl-Peptidases - isolation & purification
/ Dipeptidyl-Peptidases and Tripeptidyl-Peptidases - metabolism
/ DNA
/ Homology
/ Humans
/ Mammals
/ Mice
/ Original
/ Proteins
/ Serine Proteases - chemistry
/ Serine Proteases - isolation & purification
/ Serine Proteases - metabolism
/ Shelterin Complex - metabolism
/ Structure-function relationships
/ Telomere-Binding Proteins - chemistry
/ Telomere-Binding Proteins - isolation & purification
/ Telomere-Binding Proteins - metabolism
/ Telomeric Repeat Binding Protein 2 - chemistry
/ Telomeric Repeat Binding Protein 2 - isolation & purification
