1HLO

THE CRYSTAL STRUCTURE OF AN INTACT HUMAN MAX-DNA COMPLEX: NEW INSIGHTS INTO MECHANISMS OF TRANSCRIPTIONAL CONTROL

• PDB DOI:  https://doi.org/10.2210/pdb1HLO/pdb
• NAKB: 1HLO

• Classification: TRANSCRIPTION/DNA
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1997-09-10 Released: 1997-10-27 
• Deposition Author(s): Brownlie, P., Ceska, T.A., Lamers, M., Romier, C., Theo, H., Suck, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.273 
• R-Value Work: 0.213 
• R-Value Observed: 0.213 

Literature

The crystal structure of an intact human Max-DNA complex: new insights into mechanisms of transcriptional control.

Brownlie, P., Ceska, T., Lamers, M., Romier, C., Stier, G., Teo, H., Suck, D.

(1997) Structure 5: 509-520

• PubMed: 9115440 
• DOI: https://doi.org/10.1016/s0969-2126(97)00207-4
• Primary Citation of Related Structures:  
  1HLO


• PubMed Abstract: 
  

Max belongs to the basic helix-loop-helix leucine zipper (bHLHZ) family of transcription factors. Max is able to form homodimers and heterodimers with other members of this family, which include Mad, Mxi1 and Myc; Myc is an oncoprotein implicated in cell proliferation, differentiation and apoptosis. The homodimers and heterodimers compete for a common DNA target site (the E box) and rearrangement amongst these dimer forms provides a complex system of transcriptional regulation. Max is also regulated by phosphorylation at a site preceding the basic region. We report here the first crystal structure of an intact bHLHZ protein bound to its target site.

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Organizational Affiliation: 

EMBL Structural Biology Programme, Meyerhofstrasse 1, 69117, Heidelberg, Germany.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 25.79 kDa 
• Atom Count: 1,746 
• Modelled Residue Count: 175 
• Deposited Residue Count: 182 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (TRANSCRIPTION FACTOR MAX)	C [auth A], D [auth B]	80	Homo sapiens	Mutation(s): 0  Gene Names: MAX, BHLHD4
UniProt & NIH Common Fund Data Resources
Find proteins for P61244 (Homo sapiens) Explore P61244  Go to UniProtKB:  P61244
PHAROS:  P61244

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*CP*AP*CP*CP*AP*CP*GP*TP*GP*GP*T)-3')	A [auth C]	11	N/A

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*AP*CP*CP*AP*CP*GP*TP*GP*GP*TP*G)-3')	B [auth D]	11	N/A

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.273 
• R-Value Work: 0.213 
• R-Value Observed: 0.213 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 108	α = 90
b = 108	β = 90
c = 127	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	refinement
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-10-27 
Deposition Author(s): Brownlie, P., Ceska, T.A., Lamers, M., Romier, C., Theo, H., Suck, D.

Revision History  

• Version 1.0: 1997-10-27
  Type: Initial release
  
• Version 1.1: 2008-05-22
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance