title: Mutations in Neurospora crassa which affect multiple amino acid transport systems.
abstract: Characterization of a double mutant, his-6: hgu-4, which is unable to utilize L-histidyl-glycine as a source of histidine has revealed a new locus on linkage group V. The hgu-4 genotype results in a generalized reduced transport activity for amino acids, with a concomitant increased resistance to amino acid analogs. Transport rates and analog resistance for amino acids by this mutant are compared to the previously reported transport deficient mutants fpr-1, nap and un-3. Transport of L-aspartate as a function of temperature is examined in a variety of transport deficient strains in an attempt to explain the mode of action of mutation which pleiotropically affect several genetically and biochemically distinct amino acid transport systems.
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D001120:Arginine / Q000378:metabolism; D001224:Aspartic Acid / Q000378:metabolism; D001693:Biological Transport, Active; D002455:Cell Division; D002874:Chromosome Mapping; D007700:Kinetics; D009154:Mutation; D009491:Neurospora / Q000378:metabolism*; D009492:Neurospora crassa / Q000378:metabolism*; D010649:Phenylalanine / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D000596:Amino Acids; D001224:Aspartic Acid; D010649:Phenylalanine; D001120:Arginine