title: Four Trypanosoma brucei fatty acyl-CoA synthetases: fatty acid specificity of the recombinant proteins.
abstract: As part of our investigation of fatty acid metabolism in Trypanosoma brucei, we have expressed four acyl-CoA synthetase (TbACS) genes in Esherichia coli. The recombinant proteins, with His-tags on their C-termini, were purified to near homogeneity using nickel-chelate affinity chromatography. Although these enzymes are highly homologous, they have distinct specificities for fatty acid chain length. TbACS1 prefers saturated fatty acids in the range C(11:0) to C(14:0) and TbACS2 prefers shorter fatty acids, mainly C(10:0). TbACS3 and 4, which have 95% sequence identity, have similar specificities, favouring fatty acids between C(14:0) and C(17:0). In addition, TbACS1, 3 and 4 function well with a variety of unsaturated fatty acids.
authors.affiliation: Department of Biological Chemistry, Johns Hopkins Medical School, 725 N. Wolfe St., Baltimore, MD 21205, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Jiang
authors.forename: P T
authors.initials: PT
authors.lastname: Englund
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D003066:Coenzyme A Ligases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016384:Consensus Sequence; D004926:Escherichia coli; D005230:Fatty Acids, Nonesterified / Q000378:metabolism*; D007527:Isoenzymes / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D007700:Kinetics; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D014346:Trypanosoma brucei brucei / Q000201:enzymology* / Q000235:genetics
chemical_list: D005230:Fatty Acids, Nonesterified; D007527:Isoenzymes; D011994:Recombinant Proteins; D003066:Coenzyme A Ligases