The primary structure of human ribonuclease/angiogenin inhibitor (RAI) discloses a novel highly diversified protein superfamily with a common repetitive module.
The primary structure of human ribonuclease/angiogenin inhibitor (RAI) discloses a novel highly diversified protein superfamily with a common repetitive module.
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人核糖核酸酶/血管生成素抑制剂（RAI）的一级结构揭示了一个具有共同重复模块的新型高度多样化的蛋白质超家族。
DOI：
10.1002/j.1460-2075.1988.tb03310.x
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
M. Schweiger
中科院分区：
文献类型：
--
作者：
R. Schneider;E. Schneider;M. Thurnher;B. Auer;M. Schweiger
Immunological screening of a lambda gt11 library, constructed from HeLa mRNA, yielded several ribonuclease/angiogenin inhibitor (RAI) cDNA clones containing 900‐bp inserts. Northern blot analysis revealed that the length of the RAI mRNA is approximately 1.9 kb. Construction and screening of a eukaryotic cDNA expression library (HeLa) containing preferentially complete cDNA inserts led to the isolation of a full length clone. The complete nucleotide sequence was determined. The C‐terminal amino acid sequence deduced from the cDNA is identical to the peptide sequence obtained from a CNBr fragment of RAI, confirming the identity of the clone. The deduced primary structure of RAI consists of eight homologous tandem repeats with remarkable periodicity of leucine and cysteine residues. Each repeat is derived from the duplication of a leucine‐rich 28‐amino‐acid module. This prototype module is closely related to a repetitive 24‐amino‐acid motif of unclear function, previously found in proteins involved in important biological processes such as blood coagulation, embryonic development, cell morphogenesis and signal transduction. Although homologous, the RAI modules show distinct differences in length and amino acid composition to the modules of this group of proteins, demonstrating their high potential of variability, necessary for adaptation to very diverse roles. Based on our results we propose that these repetitive modules are a common structural feature of a novel protein superfamily whose members exert their function by highly specific protein‐protein interactions.
