title: 5'-Nucleotidase activity in adult and fetal rabbit lungs.
abstract: 5'-Nucleotidase was assayed in the membrane fractions isolated from rabbit lung homogenate. The enzyme activity was measured from the rate of hydrolysis of [U-14C]cytidine 5'-monophosphate (CMP). The optimal pH of the rate of hydrolysis is around 8.0 and the enzyme activity is stimulated by Mg2+. The apparent Km and Vmax of the enzyme in the microsomal fraction for CMP were 3.33 mM and 1.43 mumol/min/mg protein, respectively. During lung development the enzyme activity increased moderately at late gestational ages and reached its maximum level in adults (p less than 0.001). The developing profile of 5'-nucleotidase activity is similar to the developing pattern of the CMP content in rabbit lungs.
mesh_terms: D015720:5'-Nucleotidase; D000818:Animals; D003563:Cyclic CMP / Q000378:metabolism; D003576:Electron Transport Complex IV / Q000378:metabolism; D005260:Female; D005865:Gestational Age; D006863:Hydrogen-Ion Concentration; D008168:Lung / Q000196:embryology* / Q000201:enzymology; D008861:Microsomes / Q000201:enzymology; D009251:NADPH-Ferrihemoprotein Reductase / Q000378:metabolism; D009708:Nucleotidases / Q000378:metabolism*; D011247:Pregnancy; D011817:Rabbits
chemical_list: D003563:Cyclic CMP; D009251:NADPH-Ferrihemoprotein Reductase; D003576:Electron Transport Complex IV; D009708:Nucleotidases; D015720:5'-Nucleotidase