8HNI image
Deposition Date 2022-12-07
Release Date 2023-11-29
Last Version Date 2023-11-29
Entry Detail
PDB ID:
8HNI
Keywords:
DNA BINDING PROTEIN
Title:
hnRNP A2/B1 RRMs in complex with telomeric DNA
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.64 Å
R-Value Free:
0.26
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
C 1 2 1
8HNI validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Heterogeneous nuclear ribonucleoproteins A2/B1
Gene (Uniprot):HNRNPA2B1
Chain IDs:A, B, C, D, E, F, S (auth: G), T (auth: H), U (auth: I), V (auth: J), W (auth: K), X (auth: L)
Chain Length:179
Number of Molecules:12
Biological Source:Homo sapiens
UniProt ID:P22626 Pfam ID:PF00076
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(P*TP*AP*GP*GP*GP*TP*TP*AP*GP*GP*GP*T)-3')
Chain IDs:G (auth: M), H (auth: N), I (auth: O), J (auth: P), K (auth: Q), L (auth: R), M (auth: S), N (auth: T), O (auth: U), P (auth: V), Q (auth: W), R (auth: X)
Chain Length:12
Number of Molecules:12
Biological Source:Homo sapiens
Ligand Molecules
NA
Primary Citation
Structural Insight Into hnRNP A2/B1 Homodimerization and DNA Recognition.
J.Mol.Biol. 435 167920 167920 (2023)
PMID: 36528084 DOI: 10.1016/j.jmb.2022.167920

Abstact

Heterogeneous nuclear ribonucleoprotein A2/B1 (hnRNP A2/B1) has been identified as a nuclear DNA sensor. Upon viral infection, hnRNP A2/B1 recognizes pathogen-derived DNA as a homodimer, which is a prerequisite for its translocation to the cytoplasm to activate the interferon response. However, the DNA binding mechanism inducing hnRNP A2/B1 homodimerization is unknown. Here, we show the crystal structure of the RNA recognition motif (RRM) of hnRNP A2/B1 in complex with a U-shaped ssDNA, which mediates the formation of a newly observed protein dimer. Our biochemical assays and mutagenesis studies confirm that the hnRNP A2/B1 homodimer forms in solution by binding to pre-generated ssDNA or dsDNA with a U-shaped bulge. These results depict a potential functional state of hnRNP A2/B1 in antiviral immunity and other cellular processes.

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Primary Citation of related structures
8HNI