Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).

Catalysis of the reaction: 2-octoprenyl-3-methyl-6-methoxy-1,4-benzoquinone + O2 = 2-octoprenyl-3-methyl-5-hydroxy-6-methoxy-1,4-benzoquinone.

Catalysis of an oxidation-reduction (redox) reaction in which hydrogen or electrons are transferred from each of two donors, and molecular oxygen is reduced or incorporated into a donor.

Catalysis of the reaction: 2-octaprenyl-6-methoxyphenol + O2 + 4 H+ = 2-octaprenyl-6-methoxy-1,4-benzoquinol + H2O.

Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic.

Catalysis of the reaction: 2-octaprenyl-6-methoxyphenol + O2 + 4 H+ = 2-octaprenyl-6-methoxy-1,4-benzoquinol + H2O.

Catalysis of an oxidation-reduction (redox) reaction in which hydrogen or electrons are transferred from reduced flavin or flavoprotein and one other donor, and one atom of oxygen is incorporated into one donor.

Catalysis of the reaction: 2-octaprenyl-6-methoxyphenol + O2 + 4 H+ = 2-octaprenyl-6-methoxy-1,4-benzoquinol + H2O.

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.

Catalysis of an oxidation-reduction (redox) reaction in which hydrogen or electrons are transferred from NADH or NADPH and one other donor, and one atom of oxygen is incorporated into one donor.