Three-dimensional modeling of a pre-B-cell receptor.

Three-dimensional modeling of a pre-B-cell receptor.
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前 B 细胞受体的三维建模。

DOI:
10.1016/j.molimm.2003.11.030
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发表时间:
2004
影响因子:
3.6
通讯作者:
H. Jäck
H. Jäck
中科院分区:
医学3区
文献类型:
--
作者:
H. Lanig;Harald Bradl;H. Jäck

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由免疫球蛋白(IG)样前B细胞受体(pre-BCR)传递的信号对于早期前体B(pre-B)细胞的有效成熟至关重要。前BCR包含两条免疫球蛋白μ重链(μHC)、两条由非共价结合多肽VpreB和λ5组成的替代轻链(SLC)以及异二聚体信号转导物IGα/β。尽管普遍认为,前B细胞的有效扩增和分化需要从前BCR起始的信号,但该受体的三维结构尚未通过NMR或X射线光谱法确定。因此,我们使用间接计算机辅助分子模拟技术首次预测了pre-BCR的三维坐标,SLC组分VpreB和λ5的构象,以及VpreB C端和λ5 N端的所谓非Ig样独特尾部的位置和柔性。结构预测显示,VpreB和λ5的这些独特尾部在常规IgL链的CDR 3将位于的位置处从SLC突出。因此,独特的尾部可用于配体结合,这支持了最近的发现,即λ5独特的尾部是前BCR/基质细胞相互作用所需的。此外,预测λ5(β8)的额外β链与VpreB的非共价相互作用导致VpreB的三级结构的稳定。总之,三维计算机建模表明,前BCR的结构类似于传统B细胞受体(BCR)的结构,λ5独特的尾部可能是前BCR配体的主要结合位点。
Signals delivered by the immunoglobulin (Ig)-like pre-B-cell receptor (pre-BCR) are critical for efficient maturation of early precursor B (pre-B) cells. A pre-BCR contains two immunoglobulin μ-heavy chains (μHC), two surrogate light chains (SLC) consisting of the non-covalently associated polypeptides, VpreB and λ5, and the heterodimeric signaling transducer Igα/β. Although, it is generally accepted that signals initiated from the pre-BCR are required for efficient expansion and differentiation of pre-B cells, the three-dimensional structure of this receptor has not yet been determined by either NMR or X-ray spectroscopy. Therefore, we used indirect computer-assisted molecular modeling techniques to predict for the first time three-dimensional coordinates of the pre-BCR, the conformation of the SLC components, VpreB and λ5, and the position and flexibility of the so-called non-Ig-like unique tails at the C-terminus of VpreB and the N-terminus of λ5. Structure prediction revealed that these unique tails of VpreB and λ5 protrude from the SLC at the position where the CDR3 of a conventional IgL chain would be located. Thus, the unique tails are accessible for ligand binding, which supports the recent finding that the λ5 unique tail is required for pre-BCR/stroma cell interaction. Further, the non-covalent interaction of the extra β-strand of λ5 (β8) with VpreB is predicted to result in a stabilization of the tertiary structure of VpreB. In summary, three-dimensional computer modeling suggests that the structure of a pre-BCR resembles that of a conventional B-cell receptor (BCR) and that the λ5 unique tail could be a major binding site for pre-BCR ligands.
Ig 重链蛋白通过调节种系转录和重新定位 V(D)J 重组来控制 B 细胞发育。
DOI: --
发表时间: 1994
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Schlissel,MS;Morrow,T
通讯作者: Morrow,T
DOI: 10.1016/1074-7613(95)90131-0
发表时间: 1995-11-01
期刊: IMMUNITY
影响因子: 32.4
作者:
GRAWUNDER, U;LEU, TMJ;WINKLER, TH
通讯作者: WINKLER, TH
Ig 重链 V 区的替代轻链依赖性选择。
DOI: --
发表时间: 1995
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Keyna,U;Beck-Engeser,GB;Jongstra,J;Applequist,SE;Jack,HM
通讯作者: Jack,HM