申请人:Vetigen
公开号:EP0848059A1
公开(公告)日:1998-06-17
An isolated and substantially pure mammal polypeptide different from known adrenergic, serotonine and dopamine receptors, existing at least on mammalian muscle and eosinophils membranes, for instance in rat, guinea pig and humans.
The invention also relates to plasmids containing the genes coding for said polypeptide, to host cells transformed by genes coding for the above mentioned polypeptide, to nucleotide probes capable of hybridizing with the genes coding for the above mentioned polypeptide, and to polyclonal and monoclonal antibodies directed against the above mentioned polypeptide.
Said polypeptide is characterized in that it contains sites such that when said sites are exposed at the surface of a cell, they are able of binding iodocyanopindolol (ICYP) under blockade of α, β1, β2, β3-AR, serotonine 5-HT1A and serotonine 5-HT1B receptors, said binding being saturable, reversible and able to be displaced by a β-adrenergic receptor agonist SM-11044 with stereoselectivity but not by isoproterenol, norepinephrine, epinephrine, serotonine, dopamine or BRL-37344, said polypeptide (1) having an apparent molecular weight of about 30-40 kDa when labeled with 125I-iodocyanopindolol after photoaffinity labeling and separation by electrophoresis and an apparent molecular weight of about 60-80 kDa in Western blot, and (2) generating a fragment having the following formula DPX1FFQHRIHX2FSIFNX3 by acidic cleavage, wherein, X1 represents S (SEQ ID N°5) or X (SEQ ID N°6), X2 represents V (SEQ ID N°6) or W (SEQ ID N°5) and X3 represents S (SEQ ID N°5) or H (SEQ ID N°6), said polypeptide being present at least on muscles and eosinophils membranes and being a non-adrenergic receptor.
一种分离的、纯度很高的哺乳动物多肽,它不同于已知的肾上腺素能受体、血清素受体和多巴胺受体,至少存在于哺乳动物的肌肉和嗜酸性粒细胞膜上,例如存在于大鼠、豚鼠和人体内。
本发明还涉及含有上述多肽编码基因的质粒、由上述多肽编码基因转化的宿主细胞、能与上述多肽编码基因杂交的核苷酸探针以及针对上述多肽的多克隆抗体和单克隆抗体。
上述多肽的特征在于它含有这样的位点:当上述位点暴露在细胞表面时,它们能够在 α、β1、β2、β3-AR、5-羟色胺 5-HT1A 和 5-HT1B 受体的阻断下结合碘氰基吲哚洛尔(ICYP)、所述结合具有饱和性、可逆性,能被β-肾上腺素能受体激动剂 SM-11044 以立体选择性取代,但不能被异丙肾上腺素、去甲肾上腺素、肾上腺素、血清素、多巴胺或 BRL-37344 取代、所述多肽(1)在光亲和标记后用 125I-碘氰基吲哚标记并通过电泳分离时表观分子量约为 30-40 kDa,在 Western 印迹中表观分子量约为 60-80 kDa,(2)通过酸性裂解生成具有下式 DPX1FFQHRIHX2FSIFNX3 的片段、其中,X1 代表 S(SEQ ID N°5)或 X(SEQ ID N°6),X2 代表 V(SEQ ID N°6)或 W(SEQ ID N°5),X3 代表 S(SEQ ID N°5)或 H(SEQ ID N°6),所述多肽至少存在于肌肉和嗜酸性粒细胞膜上,是一种非肾上腺素能受体。