1eeo
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CRYSTAL STRUCTURE OF PROTEIN TYROSINE PHOSPHATASE 1B COMPLEXED WITH ACETYL-E-L-E-F-PTYR-M-D-Y-E-NH2
OverviewOverview
Protein tyrosine phosphatase 1B (PTP1B) displays a preference for peptides, containing acidic as well as aromatic/aliphatic residues immediately, NH(2)-terminal to phosphotyrosine. The structure of PTP1B bound with, DADEpYL-NH(2) (EGFR(988)(-)(993)) offers a structural explanation for, PTP1B's preference for acidic residues [Jia, Z., Barford, D., Flint, A., J., and Tonks, N. K. (1995) Science 268, 1754-1758]. We report here the, crystal structures of PTP1B in complex with Ac-ELEFpYMDYE-NH(2), (PTP1B.Con) and Ac-DAD(Bpa)pYLIPQQG (PTP1B.Bpa) determined to 1.8 and 1.9, A resolution, respectively. A structural analysis of PTP1B.Con and, PTP1B.Bpa shows how aromatic/aliphatic residues at the -1 and -3 positions, of peptide substrates are accommodated by PTP1B. A comparison of the, structures of PTP1B.Con and PTP1B.Bpa with that of PTP1B.EGFR(988)(-)(993), reveals the structural basis for the plasticity of PTP1B substrate, recognition. PTP1B is able to bind phosphopeptides by utilizing common, interactions involving the aromatic ring and phosphate moiety of, phosphotyrosine itself, two conserved hydrogen bonds between the Asp48, carboxylate side chain and the main chain nitrogens of the pTyr and, residue 1, and a third between the main chain nitrogen of Arg47 and the, main chain carbonyl of residue -2. The ability of PTP1B to accommodate, both acidic and hydrophobic residues immediately NH(2)-terminal to pTyr, appears to be conferred upon PTP1B by a single residue, Arg47. Depending, on the nature of the NH(2)-terminal amino acids, the side chain of Arg47, can adopt one of two different conformations, generating two sets of, distinct peptide binding surfaces. When an acidic residue is positioned at, position -1, a preference for a second acidic residue is also observed at, position -2. However, when a large hydrophobic group occupies position -1, Arg47 adopts a new conformation so that it can participate in hydrophobic, interactions with both positions -1 and -3.
DiseaseDisease
Known diseases associated with this structure: Abdominal body fat distribution, modifier of OMIM:[176885], Insulin resistance, susceptibility to OMIM:[176885]
About this StructureAbout this Structure
1EEO is a Single protein structure of sequence from Homo sapiens with MG as ligand. Active as Protein-tyrosine-phosphatase, with EC number 3.1.3.48 Full crystallographic information is available from OCA.
ReferenceReference
Structural basis of plasticity in protein tyrosine phosphatase 1B substrate recognition., Sarmiento M, Puius YA, Vetter SW, Keng YF, Wu L, Zhao Y, Lawrence DS, Almo SC, Zhang ZY, Biochemistry. 2000 Jul 18;39(28):8171-9. PMID:10889023
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