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The primary structure of hemoglobin D from the Aldabra giant tortoise, Geochelone gigantea

机译:亚达伯拉象龟Geochelone gigantea的血红蛋白D的一级结构

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The complete primary structures of alpha(D)-2- and beta-globin of hemoglobin D (Hb D) from the Aldabra giant tortoise, Geochelone gigantea, have been constructed by amino acid sequencing analysis in assistance with nucleotide sequencing analysis of PCR fragments amplified using degenerate oligonucleotide primers. Using computer-assisted sequence comparisons, the alpha(D)-2-globin shared a 92.0% sequence identity versus alpha(D)-globin of Geochelone carbonaria, a 75.2% versus alpha(D)-globin of Aves (Rhea americana) and a 62.4% versus alpha(A)-globin of Hb A expressed in adult red blood cells of Geochelone gigantea. Additionally, judging from their primary structures, an identical beta-globin was common to the two hemoglobin components, Hb A and Hb D. The alpha(D)-2- and beta-globin genes contained the three-exon and two-intron configurations and showed the characteristic of all functional vertebrate hemoglobin genes except an abnormal GC dinucleotide instead of the invariant GT at the 5' end of the second intron sequence. The introns of alpha(D)-2-globin gene were both small (224-bp/first intron, 227-bp/second intron) such that they were quite similar to those of adult alpha-type globins; the beta-globin gene has one small intron (approximately 130-bp) and one large intron (approximately 1590-bp).
机译:来自Aldabra巨型陆龟Geochelone gigantea的血红蛋白D(Hb D)的alpha(D)-2-和β-珠蛋白的完整一级结构已通过氨基酸测序分析来辅助扩增的PCR片段的核苷酸测序分析而构建使用简并的​​寡核苷酸引物。使用计算机辅助序列比较,alpha(D)-2-globin与Geochelone carbonaria的alpha(D)-globin具有92.0%的序列同一性,而Aves(Rhea americana)和Alves(a)的alpha(D)-globin具有75.2%的序列同一性。相对于在巨螯虾(Geochelone gigantea)的成年红细胞中表达的Hb A的α(A)球蛋白而言,其含量为62.4%。此外,从它们的一级结构来看,相同的β-球蛋白是两个血红蛋白成分Hb A和Hb D共有的。alpha(D)-2-和β-球蛋白基因包含三个外显子和两个内含子构型并显示了所有功能性脊椎动物血红蛋白基因的特征,除了第二内含子序列5'端的异常GC二核苷酸而不是不变的GT。 alpha(D)-2-globin基因的内含子都很小(224 bp /第一个内含子,227 bp /第二个内含子),因此它们与成年的α型球蛋白非常相似。 β-珠蛋白基因具有一个小内含子(约130 bp)和一个大内含子(约1590 bp)。

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