The Space External to the Outermost Structure of a Cell. For Cells Without External Protective or External Encapsulating Structures This Refers to Space Outside of the Plasma Membrane. This Term Covers the Host Cell Environment Outside an Intracellular Parasite.
Catalysis of an Oxidation Reduction (redox) Reaction a Reversible Chemical Reaction in Which the Oxidation State of an Atom or Atoms Within a Molecule Is Altered. One Substrate Acts As a Hydrogen or Electron Donor and Becomes Oxidized While the Other Acts As Hydrogen or Electron Acceptor and Becomes Reduced.
Interacting Selectively and Non Covalently with FAD Flavin Adenine Dinucleotide the Coenzyme or the Prosthetic Group of Various Flavoprotein Oxidoreductase Enzymes in Either the Oxidized Form FAD or the Reduced Form Fadh2.