National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: CD5L associates with IgM via the J chain. 著者: Yuxin Wang / Chen Su / Chenggong Ji / Junyu Xiao / 要旨: CD5 antigen-like (CD5L), also known as Spα or AIM (Apoptosis inhibitor of macrophage), emerges as an integral component of serum immunoglobulin M (IgM). However, the molecular mechanism underlying ...CD5 antigen-like (CD5L), also known as Spα or AIM (Apoptosis inhibitor of macrophage), emerges as an integral component of serum immunoglobulin M (IgM). However, the molecular mechanism underlying the interaction between IgM and CD5L has remained elusive. In this study, we present a cryo-electron microscopy structure of the human IgM pentamer core in complex with CD5L. Our findings reveal that CD5L binds to the joining chain (J chain) in a Ca-dependent manner and further links to IgM via a disulfide bond. We further corroborate recently published data that CD5L reduces IgM binding to the mucosal transport receptor pIgR, but does not impact the binding of the IgM-specific receptor FcμR. Additionally, CD5L does not interfere with IgM-mediated complement activation. These results offer a more comprehensive understanding of IgM and shed light on the function of the J chain in the immune system.
履歴
登録
2023年10月31日
登録サイト: PDBJ / 処理サイト: PDBJ
改定 1.0
2024年10月9日
Provider: repository / タイプ: Initial release
改定 1.1
2024年11月13日
Group: Data collection / カテゴリ: em_admin / Item: _em_admin.last_update
A: Interleukin-2,Isoform 1 of Immunoglobulin heavy constant mu L: Interleukin-2,Isoform 1 of Immunoglobulin heavy constant mu M: Interleukin-2,CD5 antigen-like J: Immunoglobulin J chain ヘテロ分子
Interleukin-2,Isoform1ofImmunoglobulinheavyconstantmu / IL-2 / T-cell growth factor / TCGF / Ig mu chain C region / Ig mu chain C region BOT / Ig mu chain ...IL-2 / T-cell growth factor / TCGF / Ig mu chain C region / Ig mu chain C region BOT / Ig mu chain C region GAL / Ig mu chain C region OU
分子量: 44086.461 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: IL2, IGHM / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P60568, UniProt: P01871