3CRO

THE PHAGE 434 CRO/OR1 COMPLEX AT 2.5 ANGSTROMS RESOLUTION

• PDB DOI: https://doi.org/10.2210/pdb3CRO/pdb
• NAKB: 3CRO

• Classification: TRANSCRIPTION/DNA
• Organism(s): Phage 434
• Mutation(s): No 


• Deposited: 1990-07-06 Released: 1991-10-15 
• Deposition Author(s): Mondragon, A., Harrison, S.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Observed: 0.220 

Literature

The phage 434 Cro/OR1 complex at 2.5 A resolution.

Mondragon, A., Harrison, S.C.

(1991) J Mol Biol 219: 321-334

• PubMed: 2038059 
• DOI: https://doi.org/10.1016/0022-2836(91)90568-q
• Primary Citation of Related Structures:  
  3CRO


• PubMed Abstract: 
  

  The crystal structure of phage 434 Cro protein in complex with a 20 base-pair DNA fragment has been determined to 2.5 A resolution. The DNA fragment contains the sequence of the OR1 operator site. The structure shows a bent conformation for the DNA, straighter at the center and more bent at the ends. The central base-pairs adopt conformations with significant deviations from coplanarity. The two molecules interact extensively along their common interface, both through hydrogen bonds and van der Waals interactions. The significance of these interactions for operator binding and recognition is discussed.

---

Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 28.42 kDa 
• Atom Count: 1,881 
• Modelled Residue Count: 170 
• 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 (434 CRO)	C [auth L], D [auth R]	71	Phage 434	Mutation(s): 0
UniProt
Find proteins for P03036 (Enterobacteria phage 434) Explore P03036  Go to UniProtKB:  P03036

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*AP*AP*GP*TP*AP*CP*AP*AP*AP*CP*TP*TP*TP*CP*TP*TP*G P*TP*AP*T)-3')	A	20	N/A

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*TP*AP*TP*AP*CP*AP*AP*GP*AP*AP*AP*GP*TP*TP*TP*GP*T P*AP*CP*T)-3')	B	20	N/A

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Observed: 0.220 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.2	α = 90
b = 47.6	β = 109.5
c = 61.7	γ = 90

Software Package:

Software Name	Purpose
TNT	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1991-10-15 
Deposition Author(s): Mondragon, A., Harrison, S.C.

Revision History  

• Version 1.0: 1991-10-15
  Type: Initial release
  
• Version 1.1: 2008-05-22
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-21
  Changes: Data collection, Database references