Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 8-mer - A2B2C2D2 Pseudo Symmetry: Cyclic - C2  (3D View)
Pseudo Stoichiometry: Homo 8-mer -A8 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 203020.34 
• Atom Count: 11962 
• Residue Count: 1306 
• Unique protein chains: 4
• Unique nucleic acid chains: 1

3A6N

The nucleosome containing a testis-specific histone variant, human H3T

• DOI: 10.2210/pdb3A6N/pdb
• NDB: NA0136

• Classification: STRUCTURAL PROTEIN/DNA
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3), Escherichia coli


• Deposited: 2009-09-04 Released: 2010-05-26 
• Deposition Author(s): Tachiwana, H., Kagawa, W., Osakabe, A., Koichiro, K., Shiga, T., Kimura, H., Kurumizaka, H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.7 Å
• R-Value Free: 0.264 
• R-Value Work: 0.228 

Literature

Structural basis of instability of the nucleosome containing a testis-specific histone variant, human H3T

Tachiwana, H., Kagawa, W., Osakabe, A., Kawaguchi, K., Shiga, T., Hayashi-Takanaka, Y., Kimura, H., Kurumizaka, H.

(2010) Proc.Natl.Acad.Sci.USA 107: 10454-10459

• PubMed: 20498094 
• DOI: 10.1073/pnas.1003064107
• Primary Citation of Related Structures:  
  3AFA


• PubMed Abstract: 
  

A histone H3 variant, H3T, is highly expressed in the testis, suggesting that it may play an important role in the chromatin reorganization required for meiosis and/or spermatogenesis. In the present study, we found that the nucleosome containing human H3T is significantly unstable both in vitro and in vivo, as compared to the conventional nucleosome containing H3.1. The crystal structure of the H3T nucleosome revealed structural differences in the H3T regions on both ends of the central alpha2 helix, as compared to those of H3.1. The H3T-specific residues (Met71 and Val111) are the source of the structural differences observed between H3T and H3.1. A mutational analysis revealed that these residues are responsible for the reduced stability of the H3T-containing nucleosome. These physical and structural properties of the H3T-containing nucleosome may provide the basis of chromatin reorganization during spermatogenesis.

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Organizational Affiliation: 

Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 162-8480, Japan.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Histone H3.1t	A, E	139	Homo sapiens	Mutation(s): 0  Gene Names: HIST3H3 (H3FT)
Find proteins for Q16695 (Homo sapiens) Go to Gene View: HIST3H3 Go to UniProtKB:  Q16695

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Histone H4	B, F	106	Homo sapiens	Mutation(s): 0  Gene Names: HIST1H4A, HIST1H4B, HIST1H4C, HIST1H4D, HIST1H4E, HIST1H4F, HIST1H4H, HIST1H4I, HIST1H4J, HIST1H4K, HIST1H4L, HIST2H4A, HIST2H4B, HIST4H4 (H4/A, H4FA, H4/I, H4FI, H4/G, H4FG, H4/B, H4FB, H4/J, H4FJ, H4/C, H4FC, H4/H, H4FH, H4/M, H4FM, H4/E, H4FE, H4/D, H4FD, H4/K, H4FK, H4/N, H4F2, H4FN, HIST2H4, H4/O, H4FO)
Find proteins for P62805 (Homo sapiens) Go to Gene View: HIST1H4A HIST1H4B HIST1H4C HIST1H4D HIST1H4E HIST1H4F HIST1H4H HIST1H4I HIST1H4J HIST1H4K HIST1H4L HIST2H4A HIST2H4B HIST4H4 Go to UniProtKB:  P62805

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Histone H2A type 1-B/E	C, G	133	Homo sapiens	Mutation(s): 0  Gene Names: HIST1H2AB, HIST1H2AE (H2AFM, H2AFA)
Find proteins for P04908 (Homo sapiens) Go to Gene View: HIST1H2AB HIST1H2AE Go to UniProtKB:  P04908

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details
Histone H2B type 1-J	D, H	129	Homo sapiens	Mutation(s): 0  Gene Names: HIST1H2BJ (H2BFR)
Find proteins for P06899 (Homo sapiens) Go to Gene View: HIST1H2BJ Go to UniProtKB:  P06899

Entity ID: 5
Molecule	Chains	Length	Organism
146-MER DNA	I,J	146	N/A

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MN	D, I, J	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N
CL	A, C, E, G	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.7 Å
• R-Value Free: 0.264 
• R-Value Work: 0.228 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 105.476	α = 90.00
b = 109.521	β = 90.00
c = 181.052	γ = 90.00

Software Package:

Software Name	Purpose
BSS	data collection
CNS	refinement
HKL-2000	data reduction
MOLREP	phasing
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-09-04 
• Released Date: 2010-05-26 
• Deposition Author(s): Tachiwana, H., Kagawa, W., Osakabe, A., Koichiro, K., Shiga, T., Kimura, H., Kurumizaka, H.

Revision History 

• Version 1.0: 2010-05-26
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Version format compliance
• Version 1.2: 2012-07-18
  Type: Structure summary