ISDA

Deposition Date 2022-01-14

Release Date 2022-06-29

Last Version Date 2023-11-29

Entry Detail

PDB ID:

7WM3

Keywords:

DNA BINDING PROTEIN/DNA

Title:

hnRNP A2/B1 RRMs in complex with single-stranded DNA

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.62 Å

R-Value Free:

0.18

R-Value Work:

0.16

R-Value Observed:

0.16

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Heterogeneous nuclear ribonucleoproteins A2/B1
Gene (Uniprot):HNRNPA2B1
Chain IDs:A, B, C, D
Chain Length:179
Number of Molecules:4
Biological Source:Homo sapiens

UniProt ID:P22626 Pfam ID:PF00076

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(P*TP*TP*AP*GP*GP*GP*TP*TP*AP*GP*GP*G)-3')
Chain IDs:E, F, G, H
Chain Length:12
Number of Molecules:4
Biological Source:Homo sapiens

Primary Citation

Structural Insight Into hnRNP A2/B1 Homodimerization and DNA Recognition.

Liu, Y, Abula, A, Xiao, H, Guo, H, Li, T, Zheng, L, Chen, B, Nguyen, H.C, Ji, X.Show

J.Mol.Biol. 435 167920 167920 (2022)

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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