A genetically encoded sensor for H2O2 with expanded dynamic range.
Hydrogen peroxide is an important second messenger controlling intracellular signaling cascades by selective oxidation of redox active thiolates in proteins. Changes in intracellular [H(2)O(2)] can be tracked in real time using HyPer, a ratiometric genetically encoded fluorescent probe. Although HyPer is sensitive and selective for H(2)O(2) due to the properties of its sensing domain derived from the Escherichia coli OxyR protein, many applications may benefit from an improvement of the indicator's dynamic range. We here report HyPer-2, a probe that fills this demand. Upon saturating [H(2)O(2)] exposure, HyPer-2 undergoes an up to sixfold increase of the ratio F500/F420 versus a threefold change in HyPer. HyPer-2 was generated by a single point mutation A406V from HyPer corresponding to A233V in wtOxyR. This mutation was previously shown to destabilize interface between monomers in OxyR dimers. However, in HyPer-2, the A233V mutation stabilizes the dimer and expands the dynamic range of the probe.
Markvicheva
Kseniya N
KN
Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, RAS, Miklukho-Maklaya 16/10, 117997 Moscow, Russia.
Bilan
Dmitry S
DS
Mishina
Natalia M
NM
Gorokhovatsky
Andrey Yu
AY
Vinokurov
Leonid M
LM
Lukyanov
Sergey
S
Belousov
Vsevolod V
VV
D016475:3T3 Cells; D000818:Animals; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D005456:Fluorescent Dyes / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000378:metabolism; D051379:Mice; D018613:Microscopy, Confocal; D009154:Mutation; D010084:Oxidation-Reduction; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D015398:Signal Transduction; D013997:Time Factors; D014162:Transfection
D029968:Escherichia coli Proteins; D005456:Fluorescent Dyes; D012097:Repressor Proteins; C499299:oxyR protein, E coli; D006861:Hydrogen Peroxide