1CB0

STRUCTURE OF HUMAN 5'-DEOXY-5'-METHYLTHIOADENOSINE PHOSPHORYLASE AT 1.7 A RESOLUTION

• PDB DOI: https://doi.org/10.2210/pdb1CB0/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 1999-02-26 Released: 1999-07-05 
• Deposition Author(s): Appleby, T.C., Erion, M.D., Ealick, S.E.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.202 
• R-Value Work: 0.181 

Literature

The structure of human 5'-deoxy-5'-methylthioadenosine phosphorylase at 1.7 A resolution provides insights into substrate binding and catalysis.

Appleby, T.C., Erion, M.D., Ealick, S.E.

(1999) Structure 7: 629-641

• PubMed: 10404592 
• DOI: https://doi.org/10.1016/s0969-2126(99)80084-7
• Primary Citation of Related Structures:  
  1CB0, 1CG6


• PubMed Abstract: 
  

  5'-Deoxy-5'-methylthioadenosine phosphorylase (MTAP) catalyzes the reversible phosphorolysis of 5'-deoxy-5'-methylthioadenosine (MTA) to adenine and 5-methylthio-D-ribose-1-phosphate. MTA is a by-product of polyamine biosynthesis, which is essential for cell growth and proliferation. This salvage reaction is the principle source of free adenine in human cells. Because of its importance in coupling the purine salvage pathway to polyamine biosynthesis MTAP is a potential chemotherapeutic target.

---

Organizational Affiliation: 

Section of Biochemistry, Molecular and Cell Biology, Cornell University, Ithaca, NY 14853, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C3  (Explore in 3D)
Global Stoichiometry: Homo 3-mer - A3 

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

Macromolecule Content

• Total Structure Weight: 31.41 kDa 
• Atom Count: 2,249 
• Modelled Residue Count: 268 
• Deposited Residue Count: 283 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (5'-DEOXY-5'-METHYLTHIOADENOSINE PHOSPHORYLASE)	A	283	Homo sapiens	Mutation(s): 1  EC: 2.4.2.28
UniProt & NIH Common Fund Data Resources
Find proteins for Q13126 (Homo sapiens) Explore Q13126  Go to UniProtKB:  Q13126
PHAROS:  Q13126 GTEx:  ENSG00000099810

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADE	B [auth A]	ADENINE C5 H5 N5 GFFGJBXGBJISGV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.202 
• R-Value Work: 0.181 
• Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 120.76	α = 90
b = 120.76	β = 90
c = 44.46	γ = 120

Software Package:

Software Name	Purpose
MADSYS	phasing
SHELX	model building
MLPHARE	phasing
X-PLOR	refinement
MOSFLM	data reduction
CCP4	data scaling
SHELX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-07-05 
Deposition Author(s): Appleby, T.C., Erion, M.D., Ealick, S.E.

Revision History  

• Version 1.0: 1999-07-05
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2023-12-27
  Changes: Data collection, Database references, Derived calculations