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标题：Serotonin binds specifically and saturably to an actin-like protein isolated from rat brain synaptosomes
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作者：D H Small ; R J Wurtman
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1984
卷号：81
期号：3
页码：959-963
DOI：10.1073/pnas.81.3.959
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：A soluble serotonin-binding protein was identified in a high-speed supernatant fraction of an osmotically shocked rat brain synaptosome (P2) preparation. The binding of serotonin was saturable (Bmax = 6.0 nmol per mg of protein) and was specific for serotonin and a few structurally related compounds including dopamine and norepinephrine. Binding of serotonin (1 microM) was inhibited approximately equal to 40% by chlorpromazine (10 microM). The affinity of serotonin for the binding protein was low in the crude extract (Kd = 1.7 X 10(-3)M). However, on purification by chromatography on a column of phenothiazine agarose, a higher affinity (Kd = 10(-5) M) binding component was also observed. The purified protein was greatly enriched in a polypeptide of Mr of 43,000 that comigrated on polyacrylamide gel with skeletal muscle actin. Muscle actin also bound serotonin, and the binding to actin was similar to that of the purified protein in both the specificity of the binding and the affinity for serotonin. It is likely that the serotonin-binding protein is identical to cytoplasmic G-actin or an actin-like protein of similar molecular weight.