Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 17656.70 
• Atom Count: 1027 
• Residue Count: 147 
• Unique protein chains: 1

1FHI

SUBSTRATE ANALOG (IB2) COMPLEX WITH THE FRAGILE HISTIDINE TRIAD PROTEIN, FHIT

• DOI: 10.2210/pdb1FHI/pdb

• Classification: NUCLEOTIDE-BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 1997-12-11 Released: 1998-06-17 
• Deposition Author(s): Pace, H.C., Garrison, P.N., Barnes, L.D., Draganescu, A., Rosler, A., Blackburn, G.M., Siprashvili, Z., Croce, C.M., Huebner, K., Brenner, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.314 
• R-Value Work: 0.241 

Literature

Genetic, biochemical, and crystallographic characterization of Fhit-substrate complexes as the active signaling form of Fhit.

Pace, H.C., Garrison, P.N., Robinson, A.K., Barnes, L.D., Draganescu, A., Rosler, A., Blackburn, G.M., Siprashvili, Z., Croce, C.M., Huebner, K., Brenner, C.

(1998) Proc.Natl.Acad.Sci.USA 95: 5484-5489

• PubMed: 9576908 
• Primary Citation of Related Structures:  
  2FHI


• PubMed Abstract: 
  

Alterations in the FHIT gene at 3p14.2 occur as early and frequent events in the development of several common human cancers. The ability of human Fhit-negative cells to form tumors in nude mice is suppressed by stable reexpression of Fhit protein. Fhit protein is a diadenosine P1,P3-triphosphate (ApppA) hydrolase whose fungal and animal homologs form a branch of the histidine triad (HIT) superfamily of nucleotide-binding proteins. Because the His-96 --> Asn substitution of Fhit, which retards ApppA hydrolase activity by seven orders of magnitude, did not block tumor-suppressor activity in vivo, we determined whether this mutation affected ApppA binding or particular steps in the ApppA catalytic cycle. Evidence is presented that His-96 --> Asn protein binds ApppA well and forms an enzyme-AMP intermediate extremely poorly, suggesting that Fhit-substrate complexes are the likely signaling form of the enzyme. The cocrystal structure of Fhit bound to Ado-p-CH2-p-ps-Ado (IB2), a nonhydrolyzable ApppA analog, was refined to 3.1 A, and the structure of His-96 --> Asn Fhit with IB2 was refined to 2.6 A, revealing that two ApppA molecules bind per Fhit dimer; identifying two additional adenosine-binding sites on the dimer surface; and illustrating that His-98 is positioned to donate a hydrogen bond to the scissile bridging oxygen of ApppA substrates. The form of Fhit bound to two ApppA substrates would present to the cell a dramatically phosphorylated surface, prominently displaying six phosphate groups and two adenosine moieties in place of a deep cavity lined with histidines, arginines, and glutamines.

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Related Citations: 

• Purification and Crystallization of Complexes Modeling the Active State of the Fragile Histidine Triad Protein
  Brenner, C.,Pace, H.C.,Garrison, P.N.,Robinson, A.K.,Rosler, A.,Liu, X.H.,Blackburn, G.M.,Croce, C.M.,Huebner, K.,Barnes, L.D.
  (1998) Protein Eng. 10: 1461




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Organizational Affiliation: 

Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
FRAGILE HISTIDINE TRIAD PROTEIN	A	147	Homo sapiens	Mutation(s): 0  Gene Names: FHIT EC: 3.6.1.29
Find proteins for P49789 (Homo sapiens) Go to Gene View: FHIT Go to UniProtKB:  P49789

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
IB2	A	P1-P2-METHYLENE-P3-THIO-DIADENOSINE TRIPHOSPHATE ADO-P-CH2-P-PS-ADO C21 H29 N10 O14 P3 S UJCWOSLCGXVJOD-LCHUORCTSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.314 
• R-Value Work: 0.241 
• Space Group: P 6₁ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 50.728	α = 90.00
b = 50.728	β = 90.00
c = 268.513	γ = 120.00

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	phasing
SCALEPACK	data scaling
X-PLOR	refinement
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-12-11 
• Released Date: 1998-06-17 
• Deposition Author(s): Pace, H.C., Garrison, P.N., Barnes, L.D., Draganescu, A., Rosler, A., Blackburn, G.M., Siprashvili, Z., Croce, C.M., Huebner, K., Brenner, C.

Revision History 

• Version 1.0: 1998-06-17
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance