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-Structure paper
| タイトル | Bispecific antibody-antigen complex structures reveal activity enhancement by domain rearrangement. |
|---|---|
| ジャーナル・号・ページ | Cell Rep, Vol. 44, Issue 7, Page 115965, Year 2025 |
| 掲載日 | 2025年7月22日 |
著者 | Kyohei Sato / Shiro Uehara / Atsushi Tsugita / Mayuka Ishii / Shieru Ishiyama / Atsushi Maejima / Ishin Nakahara / Misae Nazuka / Takashi Matsui / Gatsogiannis Christos / Takeshi Yokoyama / Izumi Kumagai / Koki Makabe / Ryutaro Asano / Yoshikazu Tanaka / ![]() |
| PubMed 要旨 | Bispecific antibodies (BsAbs) have been developed as anti-cancer drugs that accumulate activated T cells on cancer cells by bridging the antigens present in each cell. Ex3 is a diabody-type BsAb ...Bispecific antibodies (BsAbs) have been developed as anti-cancer drugs that accumulate activated T cells on cancer cells by bridging the antigens present in each cell. Ex3 is a diabody-type BsAb composed of an anti-epidermal growth factor receptor (EGFR) antibody and an anti-CD3 antibody. In the design of Ex3, the LH-type domain order (Ex3LH) is shown to have more than 100-fold greater anti-cancer activity than the HL-type domain order (Ex3HL). To understand this phenomenon of activity enhancement by domain-order rearrangement, we report here cryoelectron microscopy (cryo-EM) structures of both Ex3HL and Ex3LH in complex with EGFR and CD3. A structural comparison of the HL and LH types reveals that the domain rearrangement leads to drastic structural changes and that the avoidance of steric hindrance by a favorable bridging angle on the cell surface is the fundamental mechanism for this activity enhancement. |
リンク | Cell Rep / PubMed:40664209 |
| 手法 | EM (単粒子) |
| 解像度 | 2.93 - 3.91 Å |
| 構造データ | EMDB-60764, PDB-9ip7: EMDB-60765: HL-type bispecific diabody Ex3 composed of 528 and OKT3 Fvs in ternary complex with sEGFR and CD3gamma-epsilon (closed conformation) EMDB-60766: HL-type bispecific diabody Ex3 composed of 528 and OKT3 Fvs in ternary complex with sEGFR and CD3gamma-epsilon (middle conformation) EMDB-60767: HL-type bispecific diabody Ex3 composed of 528 and OKT3 Fvs in ternary complex with sEGFR and CD3gamma-epsilon (open conformation) EMDB-60768, PDB-9ipb: EMDB-60769: LH-type bispecific diabody Ex3 composed of 528 and OKT3 Fvs in ternary complex with sEGFR and CD3gamma-epsilon (closed conformation) EMDB-60770: LH-type bispecific diabody Ex3 composed of 528 and OKT3 Fvs in ternary complex with sEGFR and CD3gamma-epsilon (middle conformation) EMDB-60771: LH-type bispecific diabody Ex3 composed of 528 and OKT3 Fvs in ternary complex with sEGFR and CD3gamma-epsilon (open conformation) |
| 化合物 | ![]() ChemComp-NAG: |
| 由来 |
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キーワード | ANTITUMOR PROTEIN/IMMUNE SYSTEM / bispecific antibody / diabody / EGFR / HL / Ex3 / 528 / local refinement / ANTITUMOR PROTEIN / ANTITUMOR PROTEIN-IMMUNE SYSTEM complex / CD3 / ternary complex / OKT3 / LH |
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