Reactions of Deprotonated Tyrosine and Tryptophan with Electronically Excited Singlet Molecular Oxygen (a1Δg): A Guided-Ion-Beam Scattering, Statistical Modeling, and Trajectory Study

2012 ◽  
Vol 116 (22) ◽  
pp. 6369-6379 ◽  
Author(s):  
Fangwei Liu ◽  
Yigang Fang ◽  
Yun Chen ◽  
Jianbo Liu
Keyword(s):  
Molecular Oxygen ◽  
Statistical Modeling ◽  
Ion Beam ◽  
Excited Singlet ◽  
Singlet Molecular Oxygen ◽  
Guided Ion Beam ◽  
Beam Scattering ◽  
Electronically Excited

Singlet Molecular Oxygen Triggers the soxRS Regulon of Escherichia coli

2001 ◽  
Vol 382 (7) ◽  
pp. 1071-1075 ◽  
Author(s):  
Lucymara F. Agnez-Lima ◽  
Paolo Di Mascio ◽  
Bruce Demple ◽  
Carlos F.M. Menck
Keyword(s):  
Escherichia Coli ◽  
Singlet Oxygen ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Signal Molecule ◽  
Present Evidence ◽  
Oxidative Stresses ◽  
Electronically Excited ◽  
Soxrs Regulon ◽  
Intercellular Signal

AbstractThe electronically excited molecular oxygen (singlet oxygen, [1]O[2]) can be detrimental to cells in several ways, although recent reports indicate that it may play a role as an intercellular signal in eukaryotes. Here we present evidence that [1]O[2], generated by thermodissociation of disodium 3,3(1,4-naphthylidene) diproprionate endoperoxide, activates transcription of genes of the soxRS regulon, and that this induction is paralleled by induction of a soxS::lacZ operon fusion. The inductions were dependent on a functional soxR gene. These data imply that protective responses, such as induction of the soxRS regulon, may be triggered by diverse environmental oxidative stresses, and that [1]O[2] may also function as a signal molecule in prokaryotes.

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