1NWL image
Deposition Date 2003-02-06
Release Date 2003-04-01
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1NWL
Keywords:
Title:
Crystal structure of the PTP1B complexed with SP7343-SP7964, a pTyr mimetic
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:protein-tyrosine phosphatase, non-receptor type 1
Gene (Uniprot):PTPN1
Mutations:R47C
Chain IDs:A
Chain Length:298
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Discovery of a New Phosphotyrosine Mimetic for PTP1B Using Breakaway Tethering
J.Am.Chem.Soc. 125 5602 5603 (2003)
PMID: 12733877 DOI: 10.1021/ja034440c

Abstact

Protein tyrosine phosphatases play important roles in many signaling cascades involved in human disease. The identification of druglike inhibitors for these targets is a major challenge, and the discovery of suitable phosphotyrosine (pY) mimetics remains one of the key difficulties. Here we describe an extension of tethering technology, "breakaway tethering", which is ideally suited for discovering such new chemical entities. The approach involves first irreversibly modifying a protein with an extender that contains both a masked thiol and a known pY mimetic. The extender is then cleaved to release the pY mimetic, unmasking the thiol. The resulting protein is screened against a library of disulfide-containing small molecule fragments; any molecules with inherent affinity for the pY binding site will preferentially form disulfides with the extender, allowing for their identification by mass spectrometry. The ability to start from a known substrate mimimizes perturbation of protein structure and increases the opportunity to probe the active site using tethering. We applied this approach to the anti-diabetic protein PTP1B to discover a pY mimetic which belongs to a new molecular class and which binds in a novel fashion.

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