Primitive vertebrate immunity: what is the evolutionary derivative of molecules that define the adaptive immune system?

Primitive vertebrate immunity: what is the evolutionary derivative of molecules that define the adaptive immune system?
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原始脊椎动物免疫:定义适应性免疫系统的分子的进化衍生物是什么?

DOI:
10.1002/9780470514658.ch13
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发表时间:
1994
期刊:
Ciba Foundation symposium
影响因子:
--
通讯作者:
Flajnik,MF
Flajnik,MF
中科院分区:
--
文献类型:
--
作者:
Flajnik,MF

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适应性免疫系统能够通过抗原特异性受体免疫球蛋白(Ig)和T细胞受体(TCR)对无限数量的抗原做出反应。LG结合可溶性抗原,而TCR识别多态自身编码的主要组织相容性复合体(MHC)I类和II类分子裂隙中结合的抗原。所有这些分子都完全或部分由LG超家族结构域组成。TCR和LG使用V-SET LG超家族结构域,总是以异二聚体的形式,用于抗原识别。尽管TCR和Ig结合抗原的方式从根本上不同,但异二聚体V结构域的结构可能是相同的。MHC蛋白的抗原结合裂隙具有不同于LG超家族结构域的结构,尽管一些研究人员提出这个裂隙是从LG结构域进化而来的。我们认为MHC裂解是一个原始结构,可能与细胞内伴侣蛋白的多肽结合域有关。提出了一个模型,其中伴侣蛋白是原始的MHC分子,提供来自驻留在细胞内的不变蛋白的多肽,供具有最小差异受体的淋巴细胞识别。这样的系统可能反映在今天的上皮免疫系统中,显然是由单一的MHC分子和具有非传统抗原特异性受体的淋巴细胞控制的。
The adaptive immune system is capable of responding to an infinite number of antigens with the antigen‐specific receptors immunoglobulin (Ig) and the T cell receptor (TCR). lg binds soluble antigens while TCR recognizes antigen bound in clefts of polymorphic self‐encoded major histocompatibility complex (MHC) class I and class II molecules. All of these molecules are wholly or partially composed of lg superfamily domains. TCR and lg use V‐set lg superfamily domains, always in heterodimeric forms, in antigen recognition. Although the ways in which TCR and Ig bind antigen are fundamentally different, the structure of the heterodimeric V domains is probably identical. The antigen‐binding cleft of MHC proteins has a structure unlike lg superfamily domains, although several investigators have proposed that this cleft is evolutionarily derived from lg domains. We believe the MHC cleft is a primitive structure, perhaps related to the peptide‐binding domains of intracellular chaperone proteins. A model is proposed whereby chaperone proteins were the primordial MHC molecules, presenting peptides derived from invariant proteins residing inside cells for recognition by lymphocytes with minimally diverse receptors. Such a system may be reflected today by the epithelial immune system, apparently governed by monomorphic MHC molecules and lymphocytes with unconventional antigen‐specific receptors.
DOI: 10.1007/978-3-642-75875-1_7
发表时间: 1991
影响因子: --
作者:
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DOI: 10.1016/0167-5699(92)90198-g
发表时间: 1992-01-01
期刊: IMMUNOLOGY TODAY
影响因子: --
作者:
JANEWAY, CA
通讯作者: JANEWAY, CA
DOI: 10.1126/science.2756425
发表时间: 1989-07-28
期刊: SCIENCE
影响因子: 56.9
作者:
FLYNN, GC;CHAPPELL, TG;ROTHMAN, JE
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DOI: 10.1006/dbio.1993.1167
发表时间: 1993
影响因子: 2.7
作者:
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通过融合实验测试复合海鞘的集落特异性
DOI: --
发表时间: 1957
期刊:
影响因子: --
作者:
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通讯作者: Hiroshi Watanabe