ISDA

Deposition Date 2022-02-08

Release Date 2022-06-01

Last Version Date 2024-05-22

Entry Detail

PDB ID:

7TXC

Keywords:

DNA BINDING PROTEIN/DNA

Title:

HIC2 zinc finger domain in complex with the DNA binding motif-2 of the BCL11A enhancer

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Escherichia coli BL21(DE3)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

3.04 Å

R-Value Free:

0.20

R-Value Work:

0.19

R-Value Observed:

0.19

Space Group:

P 31 2 1

Download Validation Report

Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*AP*GP*AP*TP*AP*AP*TP*GP*CP*CP*AP*AP*CP*AP*GP*T)-3')
Chain IDs:A
Chain Length:16
Number of Molecules:1
Biological Source:Homo sapiens

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*AP*CP*TP*GP*TP*TP*GP*GP*CP*AP*TP*TP*AP*TP*CP*T)-3')
Chain IDs:B
Chain Length:16
Number of Molecules:1
Biological Source:Homo sapiens

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Hypermethylated in cancer 2 protein
Gene (Uniprot):HIC2
Chain IDs:C (auth: E)
Chain Length:118
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:Q96JB3 Pfam ID:PF00096

Ligand Molecules

Primary Citation

HIC2 controls developmental hemoglobin switching by repressing BCL11A transcription.

Huang, P, Peslak, S.A, Ren, R, Khandros, E, Qin, K, Keller, C.A, Giardine, B, Bell, H.W, Lan, X, Sharma, M, Horton, J.R, Abdulmalik, O, Chou, S.T, Shi, J, Crossley, M, Hardison, R.C, Cheng, X, Blobel, G.A.Show

Nat.Genet. 54 1417 1426 (2022)

PMID: 35941187 DOI: 10.1038/s41588-022-01152-6

Abstact

The fetal-to-adult switch in hemoglobin production is a model of developmental gene control with relevance to the treatment of hemoglobinopathies. The expression of transcription factor BCL11A, which represses fetal β-type globin (HBG) genes in adult erythroid cells, is predominantly controlled at the transcriptional level but the underlying mechanism is unclear. We identify HIC2 as a repressor of BCL11A transcription. HIC2 and BCL11A are reciprocally expressed during development. Forced expression of HIC2 in adult erythroid cells inhibits BCL11A transcription and induces HBG expression. HIC2 binds to erythroid BCL11A enhancers to reduce chromatin accessibility and binding of transcription factor GATA1, diminishing enhancer activity and enhancer-promoter contacts. DNA-binding and crystallography studies reveal direct steric hindrance as one mechanism by which HIC2 inhibits GATA1 binding at a critical BCL11A enhancer. Conversely, loss of HIC2 in fetal erythroblasts increases enhancer accessibility, GATA1 binding and BCL11A transcription. HIC2 emerges as an evolutionarily conserved regulator of hemoglobin switching via developmental control of BCL11A.

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Primary Citation of related structures