A macromolecular transducer as illustrated by trout hemoglobin IV.

Abstract
Oxygen binding by trout Hb IV was investigated as a function of pH up to 10 atm (1 MPa) of pure O2. An extreme proteon-oxygen linkage, which gives rise to a Root effect was revealed. The results are discussed in relation to the function of the Hb as an oxygen pump. The system is of special interest as providing a prototype of a macromolecule acting as a transducer by coupling 2 allosterically linked reactions.