Unusual Synergism of Transferrin and Citrate in the Regulation of Ti(IV) Speciation, Transport, and Toxicity.
Human serum transferrin (sTf) is a protein that mediates the transport of iron from blood to cells. Assisted by the synergistic anion carbonate, sTf transports Fe(III) by binding the metal ion in a closed conformation. Previous studies suggest sTf's role as a potential transporter of other metals su...
| Publicado en: | Journal of the American Chemical Society Vol. 138; no. 17; pp. 5659 - 5666 |
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| Autores principales: | , , , , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
5/4/2016
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=115656388&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 115656388 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 5/4/2016 vid: 138 iid: 17 pid: 997 pub: American Chemical Society artinfo: ui: 115656388 10.1021/jacs.6b01966 ppf: 5659 ppct: 7 formats: tig: atl: Unusual Synergism of Transferrin and Citrate in the Regulation of Ti(IV) Speciation, Transport, and Toxicity. aug: au: Tinoco, Arthur D. Saxena, Manoj Sharma, Shweta Noinaj, Nicholas Delgado, Yamixa Quiñones González, Ernesto P. Conklin, Steven E. Zambrana, Nicole Loza-Rosas, Sergio A. Parks, Timothy B. affil: Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, Rio Piedras, Puerto Rico 00931 Department of Environmental Sciences, University of Puerto Rico, Rio Piedras Campus, Rio Piedras, Puerto Rico 00931 Department of Biological Sciences, Purdue University, 240 S. Martin Jischke Drive, Hockmeyer Hall, West Lafayette, Indiana 47907, United States VA Caribbean Healthcare System, 10 Casia Street, San Juan, Puerto Rico 00921 su: Transferrin Citrates Carbonates Titanium Metals Antineoplastic agents sug: subj: Transferrin Citrates Carbonates Titanium Metals Antineoplastic agents ab: Human serum transferrin (sTf) is a protein that mediates the transport of iron from blood to cells. Assisted by the synergistic anion carbonate, sTf transports Fe(III) by binding the metal ion in a closed conformation. Previous studies suggest sTf's role as a potential transporter of other metals such as titanium. Ti is a widely used metal in colorants, foods, and implants. A substantial amount of Ti is leached into blood from these implants. However, the fate of the leached Ti and its transport into the cells is not known. Understanding Ti interaction with sTf assumes a greater significance with our ever increasing exposure to Ti in the form of implants. On the basis of in vitro studies, it was speculated that transferrin can bind Ti(IV) assisted by a synergistic anion. However, the role and identity of the synergistic anion(s) and the conformational state in which sTf binds Ti(IV) are not known. Here we have solved the first X-ray crystal structure of a Ti(IV)-bound sTf. We find that sTf binds Ti(IV) in an open conformation with both carbonate and citrate as synergistic anions at the metal binding sites, an unprecedented role for citrate. Studies with cell lines suggest that Ti(IV)-sTf is transported into cells and that sTf and citrate regulate the metal's blood speciation and attenuate its cytotoxic property. Our results provide the first glimpse into the citrate-transferrin synergism in the regulation of Ti(IV) bioactivity and offers insight into the future design of Ti(IV)-based anticancer drugs. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2016 holdings: @attributes: islocal: N |
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