8YE8 | pdb_00008ye8

Crystal structure of mouse BAHCC1 TTD domain in complex with H4K20me1 peptide

• PDB DOI: https://doi.org/10.2210/pdb8YE8/pdb

• Classification: PROTEIN BINDING
• Organism(s): Mus musculus, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-02-22 Released: 2025-07-16 
• Deposition Author(s): Zhang, Z.-M., Song, J.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 
  0.238 (Depositor), 0.237 (DCC) 
• R-Value Work: 
  0.187 (Depositor), 0.191 (DCC) 
• R-Value Observed: 
  0.191 (Depositor) 

Starting Model: experimental

Literature

BAHCC1 binds H4K20me1 to facilitate the MCM complex loading and DNA replication.

Li, D., Zhang, Z.M., Mei, L., Yu, Y., Guo, Y., Mackintosh, S.G., Chen, J., Allison, D.F., Kim, A., Storey, A.J., Edmondson, R.D., Byrum, S.D., Tackett, A.J., Cai, L., Cook, J.G., Song, J., Wang, G.G.

(2025) Nat Commun 16: 5502-5502

• PubMed: 40592879 
• DOI: https://doi.org/10.1038/s41467-025-61284-1
• Primary Citation of Related Structures:  
  8YE8


• PubMed Abstract: 
  

  Mono-methylation of histone H4 lysine 20 (H4K20me1) regulates DNA replication, cell cycle progression and DNA damage repair. How exactly H4K20me1 regulates these biological processes remains unclear. Here, we report that an evolutionarily conserved tandem Tudor domain (TTD) in BAHCC1 (BAHCC1 ^TTD ) selectively reads H4K20me1 for facilitating replication origin activation and DNA replication. Our biochemical, structural, genomic and cellular analyses demonstrate that BAHCC1 ^TTD preferentially recognizes H4K20me1 to promote the recruitment of BAHCC1 and its interacting partners, notably Mini-chromosome Maintenance (MCM) complex, to replication origin sites. Combined actions of the H4K20me1-reading BAHCC1 and the H4K20me2-reading Origin Recognition Complex (ORC) ensure genomic loading of MCM for replication. Depletion of BAHCC1, or disruption of the BAHCC1 ^TTD :H4K20me1 interaction, reduces H4K20me1 levels and MCM loading, leading to defects in replication origin activation and cell cycle progression. In summary, this study identifies BAHCC1 ^TTD as an effector transducing H4K20me1 signals into MCM recruitment to promote DNA replication.

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Organizational Affiliation: 
• Department of Biochemistry and Biophysics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
Polyseq Biotech Inc., Beijing, P. R. China.
Department of Biochemistry, University of California, Riverside, Riverside, CA, 92521, USA.
College of Pharmacy, Jinan University, Guangzhou, P. R. China.
Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC, 27710, USA.
Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA.
Triangle Biotechnology Inc., Durham, NC, USA.
Department of Pathology, Duke University School of Medicine, Durham, NC, 27710, USA.
Duke Cancer Institute, Duke University School of Medicine, Durham, NC, 27710, USA.
Department of Biochemistry and Biophysics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA. [e-mail].
Department of Biochemistry, University of California, Riverside, Riverside, CA, 92521, USA. [e-mail].
Department of Biochemistry and Biophysics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA. [e-mail].
Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC, 27710, USA. [e-mail].
Duke Cancer Institute, Duke University School of Medicine, Durham, NC, 27710, USA. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 32.96 kDa 
• Atom Count: 2,167 
• Modeled Residue Count: 260 
• Deposited Residue Count: 294 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BAH and coiled-coil domain-containing protein 1	A, B	141	Mus musculus	Mutation(s): 0  Gene Names: Bahcc1, Kiaa1447
UniProt
Find proteins for Q3UHR0 (Mus musculus) Explore Q3UHR0  Go to UniProtKB:  Q3UHR0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H4	C	12	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P62805 (Homo sapiens) Explore P62805  Go to UniProtKB:  P62805
PHAROS:  P62805 GTEx:  ENSG00000274618 ENSG00000197238 ENSG00000197837 ENSG00000158406 ENSG00000278705 ENSG00000197061 ENSG00000270882 ENSG00000270276 ENSG00000273542 ENSG00000277157 ENSG00000276966 ENSG00000276180 ENSG00000278637 ENSG00000275126

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MLZ	C	L-PEPTIDE LINKING	C7 H16 N2 O2		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free:  0.238 (Depositor), 0.237 (DCC) 
• R-Value Work:  0.187 (Depositor), 0.191 (DCC) 
• R-Value Observed: 0.191 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.695	α = 90
b = 65.286	β = 90
c = 78.67	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data scaling
Coot	model building
PHENIX	phasing
HKL-2000	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-07-16 
Deposition Author(s): Zhang, Z.-M., Song, J.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2025-07-16
  Type: Initial release