Structure-Function Relationships in Chloroquine and Related 4-Aminoquinoline Antimalarials

Recent publications have provided strong evidence that activity and cellular uptake of 4-aminoquinoline antimalarials depends on vacuolar haemoglobin degradation and that haematin is the drug target. Studies on haematin-quinoline interactions have provided insight into the structural requirements for these interactions and indications are that 4-aminoquinolines may act by inhibiting haemozoin formation. Structural requirements for this activity have also been reported recently and have led to construction of an empirical structure-function relationship for 4-aminoquinolines.