title: Synthesis and characterization of a ruthenium(II)-based redox conjugate for reagentless biosensing.
abstract: Synthesis of a novel sulfhydryl-specific, tetraammine Ru(II)polypyridyl complex, [Ru(II)(NH(3))(4)(1,10-phenanthroline-5-maleimide)](PF(6))(2), which exhibits environment-sensitive electrochemical properties is described. When conjugated to an allosteric site in a genetically engineered mutant of maltose binding protein, the formal potential of the conjugated redox probe is shifted to higher potential upon maltose binding. The magnitude of this potential shift was used to measure maltose affinity of the protein-redox conjugate complex and to monitor maltose concentration in solution. These results are presented in context of reagentless biosensing.
authors.affiliation: Center for Biomolecular Science and ENgineering, Code 6900 Naval Research Laboratory, Washington, DC 20375, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Trammell
authors.forename: H M
authors.initials: HM
authors.lastname: Goldston
authors.forename: P T
authors.initials: PT
authors.lastname: Tran
authors.forename: L M
authors.initials: LM
authors.lastname: Tender
authors.forename: D W
authors.initials: DW
authors.lastname: Conrad
authors.forename: D E
authors.initials: DE
authors.lastname: Benson
authors.forename: H W
authors.initials: HW
authors.lastname: Hellinga
mesh_terms: D015374:Biosensing Techniques; D002352:Carrier Proteins / Q000737:chemistry* / Q000235:genetics; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D008301:Maleimides / Q000138:chemical synthesis*; D008320:Maltose / Q000378:metabolism; D058619:Maltose-Binding Proteins; D010084:Oxidation-Reduction; D010618:Phenanthrolines / Q000737:chemistry*; D011485:Protein Binding / Q000502:physiology; D015202:Protein Engineering; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D002352:Carrier Proteins; D008301:Maleimides; D058619:Maltose-Binding Proteins; D010618:Phenanthrolines; C043592:maleimide; D008320:Maltose; D012428:Ruthenium; C025205:1,10-phenanthroline