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
Mutation(s): No

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.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 3.10 Å
R-Value Free: 0.314
R-Value Work: 0.241
R-Value Observed: 0.241

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

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 U S A 95: 5484-5489

PubMed: 9576908 Search on PubMedSearch on PubMed Central
DOI: 10.1073/pnas.95.10.5484
Primary Citation of Related Structures:
2FHI, 1FHI

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.

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

Organizational Affiliation:

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

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
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) Explore P49789 Go to UniProtKB: P49789
NIH Common Fund Data Resources
PHAROS: P49789 GTEx: ENSG00000189283
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
IB2 Query on IB2 Download Ideal Coordinates CCD File SDF format, chain B [A] MOL2 format, chain B [A]	A	P1-P2-METHYLENE-P3-THIO-DIADENOSINE TRIPHOSPHATE C₂₁ H₂₉ N₁₀ O₁₄ P₃ S UJCWOSLCGXVJOD-LCHUORCTSA-N		Ligand Interaction