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首页> 外文期刊>Journal of Neurochemistry: Offical Journal of the International Society for Neurochemistry >Recombinant human NMDA homomeric NR1 receptors expressed in mammalian cells form a high-affinity glycine antagonist binding site.
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Recombinant human NMDA homomeric NR1 receptors expressed in mammalian cells form a high-affinity glycine antagonist binding site.

机译:在哺乳动物细胞中表达的重组人NMDA同源NR1受体形成了高亲和力的甘氨酸拮抗剂结合位点。

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摘要

The cDNA NYMDAR1 (NR1) encodes a single polypeptide that forms a receptor-channel complex with electrophsiological and pharmacological properties characteristic of the N-methyl-D-aspartate receptor. Homomeric NR1 recombinant receptors expressed in Xenopus oocytes show functional responses with low levels of conductance. In this study we have characterized, by radioligand binding techniques, the pharmacological properties of homomeric receptors of two human NR1 isoforms (NR1a and NR1e, which differ in their C-terminal region), transiently expressed in human embryonic kidney 293 cells. The glycine site antagonist (+/-)-4-(trans)-2-carboxy-5,7-dichloro-4-[3H]phenylaminocarbonylamino - 1,2,3,4-tetrahydroquinoline ([3H]L-689,560) bound to NR1a- and NR1e-transfected cells with high affinity (KD = 3.29 and 1.61 nM, respectively). Bmax values for NR1a- and NR1e-transfected cells were 3.82 and 1.69 pmol/mg of protein, respectively, and Hill coefficients were close to unity. Ki values for glycine site antagonists inhibiting [3H]L-689,560 binding to NR1e-transfected cells were similar to those observed with rat brain membranes. Affinity values for agonists and partial agonists were four-to 16-fold weaker, indicating that the glycine site of homomeric NR1 receptors is in an antagonist-preferring state. Ki values obtained with NR1a-transfected cells were approximately twofold lower than those obtained with NR1e-transfected cells. High-affinity binding to NR1-transfected cells was not observed with the transmitter recognition site radioligands L-[3H]glutamate and D,L-(epsilon)-2-[3H]amino-4-propyl-5-phosphono-3-pentanoic acid ([3H]CGP-39653) or the ion-channel radioligand [3H]dizocilpine ([3H]MK-801).(ABSTRACT TRUNCATED AT 250 WORDS)
机译:cDNA NYMDAR1(NR1)编码单个多肽,该多肽形成具有N-甲基-D-天冬氨酸受体的电生理和药理学特性的受体通道复合物。在非洲爪蟾卵母细胞中表达的同源NR1重组受体显示出低水平电导的功能响应。在这项研究中,我们已经通过放射性配体结合技术表征了在人类胚胎肾293细胞中瞬时表达的两种人类NR1亚型(NR1a和NR1e,其C端区域不同)的同型受体的药理特性。甘氨酸位点拮抗剂(+/-)-4-(反式)-2-羧基-5,7-二氯-4- [3H]苯基氨基羰基氨基-1,2,3,4-四氢喹啉([3H] L-689,560)以高亲和力(分别为KD = 3.29和1.61 nM)与NR1a和NR1e转染的细胞结合。 NR1a和NR1e转染的细胞的Bmax值分别为3.82和1.69 pmol / mg蛋白质,希尔系数接近于1。甘氨酸位点拮抗剂抑制[3H] L-689,560与NR1e转染细胞结合的Ki值与在大鼠脑膜上观察到的值相似。激动剂和部分激动剂的亲和力弱了4至16倍,表明同型NR1受体的甘氨酸位点处于拮抗剂优先状态。用NR1a转染的细胞获得的Ki值大约是用NR1e转染的细胞获得的Ki值的两倍。发射机识别位点放射性配体L- [3H]谷氨酸和D,L-(ε)-2- [3H]氨基-4-丙基-5-膦酰基-3-未观察到与NR1转染细胞的高亲和力结合。戊酸([3H] CGP-39653)或离子通道放射性配体[3H]二唑西平([3H] MK-801)。(摘要截短为250字)

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