The purification and identification of calmodulin from human placenta.
A protein which showed similarity to bovine brain calmodulin in electrophoretic mobilities on polyacrylamide gels in the presence of 40% glycerol (pH 8.6) and 0.1% sodium dodecyl sulfate (pH 7.2) was isolated from human placenta. Its final yield was approx. 4 mg per kg human placenta. The placenta protein was similar to bovine brain calmodulin in stimulating bovine brain calmodulin-deficient cyclic nucleotide phosphodiesterase in the presence of calcium. However, its stimulating activity was eliminated by ethyleneglycol-bis(beta-aminoethyl ether)-N,N'-tetraacetic acid (EGTA) or trifluoperazine. In addition, there is a close resemblance in amino acid composition between the placental protein and bovine brain calmodulin. These results indicate that calmodulin is present in human placenta.
D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002135:Calcium-Binding Proteins / Q000302:isolation & purification*; D002147:Calmodulin / Q000302:isolation & purification* / Q000494:pharmacology; D002417:Cattle; D004789:Enzyme Activation; D005260:Female; D006801:Humans; D008970:Molecular Weight; D010920:Placenta / Q000032:analysis*; D011247:Pregnancy
D000596:Amino Acids; D002135:Calcium-Binding Proteins; D002147:Calmodulin; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D002118:Calcium