Acid phosphatases in the frog (Rana esculenta) skeletal muscle. Purification and some properties of the low molecular weight enzyme.
1. The presence of high-Mr and low-Mr acid phosphatases [orthophosphoric-monoester phosphohydrolase, (acid optimum), EC 3.1.3.2] in the skeletal muscle of frog Rana esculenta was reported. 2. The subcellular localization and some characteristics of both enzymes were also described. 3. The low-Mr AcPase was purified to homogeneity. The enzyme did not absorb on Concanavalin A-Sepharose 4B indicating that this was not a glycoprotein. 4. The enzyme is homogeneous on polyacrylamide gel electrophoresis and moves as a single band of Mr 13.7 +/- 0.8 kDa in the presence of sodium dodecyl sulphate. 5. The Mr of the native enzyme was 14.0 +/- 1.1 kDa as determined by gel filtration on a Sephadex G-100 column. The isoelectric point was 6.02. 6. The enzyme was strongly inhibited by 1 mM Ag+, Hg2+, Sn2+ and Cu2+ while other cations both at 10(-2) and 10(-3) M showed little or no effect. 7. The enzyme was insensitive to NaF and tartrate but was strongly deactivated by formaldehyde, PMB, Iodoacetamide and Triton X-100. Phosphate was a competitive inhibitor (k1 = 0.83 mM). 8. The best substrate for the enzyme was p-nitrophenylphosphate but phenylphosphate, flavin mononucleotide and o-P-tyrosine were also hydrolyzed, though at different rates. 9. The enzyme activity was enhanced in the presence of methanol, ethanol, acetone and glycerol indicating a phosphotransferase activity.
Panara
F
F
Istituto di Biologia Cellulare, Universita di Perugia, Italy.
Angiolillo
A
A
Secca
T
T
Di Rosa
I
I
Fagotti
A
A
Pascolini
R
R
D000135:Acid Phosphatase / Q000302:isolation & purification* / Q000378:metabolism; D000818:Animals; D002458:Cell Fractionation; D002848:Chromatography, DEAE-Cellulose; D004591:Electrophoresis, Polyacrylamide Gel; D004795:Enzyme Stability; D008970:Molecular Weight; D009132:Muscles / Q000201:enzymology*; D011893:Rana esculenta
D000135:Acid Phosphatase