Three-dimensional modeling of a pre-B-cell receptor.
Three-dimensional modeling of a pre-B-cell receptor.
复制标题
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
中科院分区:
文献类型:
--
作者:
H. Lanig;Harald Bradl;H. Jäck
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.
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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
影响因子:
32.4
作者:
GRAWUNDER, U;LEU, TMJ;WINKLER, TH
通讯作者:
WINKLER, TH
DOI:
10.1073/pnas.97.10.5399
发表时间:
2000-05-09
影响因子:
11.1
作者:
Graille, M;Stura, EA;Silverman, GJ
通讯作者:
Silverman, GJ
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