title: Synthesis and biological evaluation of a targeted library of protein phosphatase inhibitors.
abstract: Phosphorylation of serine, threonine, and tyrosine controls fundamental mammalian cell events and is achieved by kinases which, in turn, are in dynamic relationship with phosphatases. Few selective inhibitors of protein tyrosine and dual specificity phosphatases are readily available. Based on SAR studies of naturally occurring phosphatase inhibitors and following up on previously published research, we have designed a new pharmacophore model V and synthesized a new library of functional analogues of V. All synthetic steps were carried out and optimized employing combinatorial chemistry methods on Wang resin. All compounds were tested in vitro for their ability to inhibit recombinant human protein tyrosine (PTP1B) and dual-specificity (Cdc25B(2) and VHR) phosphatases. Three of the approximately 70 compounds in our library inhibited Cdc25B(2) by 50% at 375-490 microM. No compounds inhibited PTP1B, and only one blocked VHR. Cell-culture studies revealed no toxicity to human breast cancer cells with two of the phosphatase inhibitors.
authors.affiliation: Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: P
authors.initials: P
authors.lastname: Wipf
authors.forename: D C
authors.initials: DC
authors.lastname: Aslan
authors.forename: D K
authors.initials: DK
authors.lastname: Luci
authors.forename: E C
authors.initials: EC
authors.lastname: Southwick
authors.forename: J S
authors.initials: JS
authors.lastname: Lazo
mesh_terms: D019992:Databases as Topic; D015195:Drug Design; D004791:Enzyme Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D004988:Ethers, Cyclic / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D007202:Indicators and Reagents; D007700:Kinetics; D008387:Marine Toxins; D052998:Microcystins; D008958:Models, Molecular; D019319:Okadaic Acid / Q000737:chemistry / Q000494:pharmacology; D010080:Oxazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D010456:Peptides, Cyclic / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D010749:Phosphoprotein Phosphatases / Q000037:antagonists & inhibitors*; D013329:Structure-Activity Relationship
chemical_list: D004791:Enzyme Inhibitors; D004988:Ethers, Cyclic; D007202:Indicators and Reagents; D008387:Marine Toxins; D052998:Microcystins; D010080:Oxazoles; D010456:Peptides, Cyclic; D019319:Okadaic Acid; C078588:microcystin; C059041:calyculin A; D010749:Phosphoprotein Phosphatases