title: [Isolation and purification of aspartyl- and valyl-tRNA-synthetases from muscles of normal and long-fasting rabbits. Structural characteristics and various kinetic parameters].
abstract: Highly purified aspartyl- and valyl-tRNA synthetases were obtained by 6-stage purification from normal and long-fasting rabbit's muscles. The molecular masses of the enzymes are (120 +/- 10) X 10(3). These proteins consist of two subunits (alpha 2-type) with (60 +/- 10) X X 10(3) molecular mass as determined by electrophoresis in SDS polyacrylamide gel. The values of Km for ATP are similar for all the studied enzymes (4.25 divided by 6.48) M X 10(-3) but Km for amino acids differ: (1.22 divided by 3.3) M X 10(-4) for normal and (13.8 divided by 18.9) X M-4 for enzymes from long-fasting rabbits. The molecular activity of the latter increases 2.5-3 fold.
mesh_terms: D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D007700:Kinetics; D008297:Male; D008970:Molecular Weight; D009132:Muscles / Q000201:enzymology*; D012346:RNA, Transfer, Amino Acyl / Q000302:isolation & purification*; D011817:Rabbits; D013217:Starvation / Q000201:enzymology*; D013997:Time Factors
chemical_list: D012346:RNA, Transfer, Amino Acyl
vernacular_title: Vydelenie i ochistka asparagil- i valil-tRNK-sintetaz iz myshts normal'nykh i dlitel'no golodavshikh krolikov. Strukturnye osobennosti i nekotorye kineticheskie parametry.