Variable lymphocyte receptor recognition of the immunodominant glycoprotein of Bacillus anthracis spores.

Variable lymphocyte receptor recognition of the immunodominant glycoprotein of Bacillus anthracis spores.
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DOI:
10.1016/j.str.2012.01.009
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发表时间:
2012-03-07
期刊:
影响因子:
5.7
通讯作者:
Wilson, Ian A.
Wilson, Ian A.
中科院分区:
生物学2区
文献类型:
--
作者:
Kirchdoerfer, Robert N.;Herrin, Brantley R.;Han, Byung Woo;Turnbough, Charles L., Jr.;Cooper, Max D.;Wilson, Ian A.

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可变淋巴细胞受体(VLRs)是无颌鱼的适应性免疫受体,它独立于其他脊椎动物进化出适应性免疫。代替基于免疫球蛋白折叠的T细胞和B细胞受体,无颌鱼的淋巴细胞样细胞表达由富含亮氨酸的重复序列组成的VLRs (A, B或C),在结构上与toll样受体(TLRs)相似,但在功能上与抗体(VLRB)和T细胞受体(VLRA, C)相似。本文研究了与炭疽芽孢杆菌免疫优势糖蛋白BclA复合物的VLRB VLR4的结构和生化特性。结合晶体学、诱变和结合研究,我们描述了VLR4和BclA之间的抗原识别和结合模式,研究了VLR4识别抗原的共性,并证明了VLR4作为鉴定炭疽芽孢杆菌的诊断工具的潜力。
Variable Lymphocyte Receptors (VLRs) are the adaptive immune receptors of jawless fish, which evolved adaptive immunity independent of other vertebrates. In lieu of the immunoglobulin-fold based T- and B-cell receptors, lymphocyte-like cells of jawless fish express VLRs (A, B or C) composed of leucine-rich repeats and are similar to toll-like receptors (TLRs) in structure, but antibodies (VLRB) and T cell receptors (VLRA, C) in function. Here we present the structural and biochemical characterization of VLR4, a VLRB, in complex with BclA, the immunodominant glycoprotein of Bacillus anthracis spores. Using a combination of crystallography, mutagenesis and binding studies, we delineate the mode of antigen recognition and binding between VLR4 and BclA, examine commonalities in VLRB recognition of antigens, and demonstrate the potential of VLR4 as a diagnostic tool for the identification of B. anthracis spores.
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