Cloning of the cDNA encoding a neuronal myosin heavy chain from mammalian brain and its differential expression within the central nervous system.

Cloning of the cDNA encoding a neuronal myosin heavy chain from mammalian brain and its differential expression within the central nervous system.
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编码哺乳动物大脑神经元肌球蛋白重链的 cDNA 的克隆及其在中枢神经系统内的差异表达。

DOI:
10.1016/0022-2836(92)90482-y
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发表时间:
1992
影响因子:
5.6
通讯作者:
Chantler,PD
Chantler,PD
中科院分区:
生物学2区
文献类型:
--
作者:
Sun,W;Chantler,PD

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通过对从大鼠脑cDNA文库中分离的cDNA克隆进行测序,推导出哺乳动物脑神经元肌球蛋白重链(MHC)的完整氨基酸序列(1999个氨基酸,230 kDa)。使用亲和纯化的多克隆抗体筛选文库,所述多克隆抗体是针对从神经元衍生的细胞系(Neuro-2A)纯化的肌球蛋白产生的。来自Neuro-2A细胞和大鼠脑的基因组DNA的限制性内切酶与来自这两个来源的测序同种型的同一性一致。RNA印迹分析表明这种肌球蛋白在大脑皮层和脊髓中表现出差异表达。在肝脏、肾脏、心脏、脾脏或骨骼肌中,或甚至在脑的其他区域内均未观察到表达。将这种神经元MHC的序列与其他非肌肉MHC的序列进行比较,其显示出结构的总体相似性,特别是在头部内的保守区域(ATP结合位点、肌动蛋白结合位点、反应性硫醇)和α-螺旋卷曲螺旋尾的存在方面,所述α-螺旋卷曲螺旋尾可以排列为28个残基重复单元加上4个跳跃残基。由72个氨基酸残基组成的独特的非螺旋尾片段标志着这种神经元肌球蛋白同种型的C-末端。
The complete amino acid sequence of a neuronal myosin heavy chain (MHC) from mammalian brain (1999 amino acids, 230 kDa) has been deduced by sequencing cDNA clones isolated from a rat brain cDNA library. The library was screened using an affinity-purified polyclonal antibody that had been raised against myosin purified from a neuronally-derived cell line (Neuro-2A). Restriction digests of genomic DNA from Neuro-2A cells and rat brain are consistent with an identity of the sequenced isoform from these two sources. RNA blot analysis demonstrates this myosin to exhibit differential expression within the cerebral cortex and spinal cord. No expression was observed in liver, kidney, heart, spleen or skeletal muscle, or even within other regions of the brain. The sequence of this neuronal MHC is compared with those of other non-muscle MHCs, to which it shows an overall similarity of structure, especially with respect to conserved regions within the head (ATP binding site, actin binding site, reactive thiols) and the presence of an α-helical coiled-coil tail that can be arranged as 28-residue repeating units plus four skip residues. A unique non-helical tailpiece composed of 72 amino acid residues marks the C-terminus of this neuronal myosin isoform.
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DOI: --
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