title: Genetic polymorphism, mapping, and characterization of isocitrate dehydrogenase in Anopheles quadrimaculatus.
abstract: The isocitrate dehydrogenase-2 (Idh-2) locus of Anopheles quadrimaculatus was analyzed genetically and the enzyme was characterized physiochemically. Three-point testcrosses involving chromosome 3 markers showed that in female hybrids the gene sequence and the map distances are: nonstripe (st)--6.8--Idh-2--43.5--short antenna (Sa). Reduced recombination frequencies were observed in male hybrids (st--3.4--Idh-2--25.5--Sa). Idh-2 activity gradually increases during development and reaches a peak intensity in adults. Maximum enzyme activity of Idh-2 was obtained at pH 7.5. One-minute heat treatment at 50 degrees C caused about 50 percent reduction of IDH-2. Ethylene diamine tetraacetic acid (EDTA 5 mM) and p-chloromercuribenzoate (pCMB 10(-5)M) caused complete loss of activity of IDH-2, but pretreatment of the enzyme in situ with mercaptoethanol protected the activity of allozymes from inhibition by pCMB treatment.
mesh_terms: D000818:Animals; D000852:Anopheles / Q000201:enzymology / Q000235:genetics*; D002874:Chromosome Mapping; D005260:Female; D006824:Hybridization, Genetic; D007521:Isocitrate Dehydrogenase / Q000037:antagonists & inhibitors / Q000235:genetics*; D008297:Male; D011110:Polymorphism, Genetic; D011995:Recombination, Genetic
chemical_list: D007521:Isocitrate Dehydrogenase