title: Coordination of platinum therapeutic agents to met-rich motifs of human copper transport protein1.
abstract: Platinum therapeutic agents are widely used in the treatment of several forms of cancer. Various mechanisms for the transport of the drugs have been proposed including passive diffusion across the cellular membrane and active transport via proteins. The copper transport protein Ctr1 is responsible for high affinity copper uptake but has also been implicated in the transport of cisplatin into cells. Human hCtr1 contains two methionine-rich Mets motifs on its extracellular N-terminus that are potential platinum-binding sites: the first one encompasses residues 7-14 with amino acid sequence Met-Gly-Met-Ser-Tyr-Met-Asp-Ser and the second one spans residues 39-46 with sequence Met-Met-Met-Met-Pro-Met-Thr-Phe. In these studies, we use liquid chromatography and mass spectrometry to compare the binding interactions between cisplatin, carboplatin and oxaliplatin with synthetic peptides corresponding to hCtr1 Mets motifs. The interactions of cisplatin and carboplatin with Met-rich motifs that contain three or more methionines result in removal of the carrier ligands of both platinum complexes. In contrast, oxaliplatin retains its cyclohexyldiamine ligand upon platinum coordination to the peptide.
authors.affiliation: Department of Chemistry, Duke University, Durham, NC 27708-0346, USA.
authors.forename: Sarah E
authors.initials: SE
authors.lastname: Crider
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Holbrook
authors.forename: Katherine J
authors.initials: KJ
authors.lastname: Franz
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000378:metabolism; D027682:Cation Transport Proteins / Q000737:chemistry* / Q000378:metabolism; D002853:Chromatography, Liquid; D000079923:Copper Transporter 1; D006801:Humans; D013058:Mass Spectrometry; D008715:Methionine / Q000737:chemistry* / Q000378:metabolism; D058977:Molecular Sequence Annotation; D008969:Molecular Sequence Data; D009646:Norleucine / Q000737:chemistry / Q000378:metabolism; D009944:Organoplatinum Compounds / Q000737:chemistry* / Q000378:metabolism; D010455:Peptides / Q000737:chemistry / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D027682:Cation Transport Proteins; D000079923:Copper Transporter 1; D009944:Organoplatinum Compounds; D010455:Peptides; C490079:SLC31A1 protein, human; D009646:Norleucine; D008715:Methionine