National Institutes of Health/National Cancer Institute (NIH/NCI)
R21-CA219899
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
R21-CA227709
米国
Department of Defense (DOD, United States)
W81XMH-19-1-0046
米国
引用
ジャーナル: RSC Chem Biol / 年: 2025 タイトル: Cryo-electron microscopy reveals a single domain antibody with a unique binding epitope on fibroblast activation protein alpha. 著者: Zhen Xu / Akesh Sinha / Darpan N Pandya / Nicholas J Schnicker / Thaddeus J Wadas / 要旨: Fibroblast activation protein alpha (FAP) is a serine protease that is expressed at basal levels in benign tissues but is overexpressed in a variety of pathologies, including cancer. Despite this ...Fibroblast activation protein alpha (FAP) is a serine protease that is expressed at basal levels in benign tissues but is overexpressed in a variety of pathologies, including cancer. Despite this unique expression profile, designing functional diagnostic and therapeutic agents that effectively target this biomarker remains elusive. Here we report the structural characterization of the interaction between a novel single domain antibody (sdAb), I3, and FAP using cryo-electron microscopy. The reconstructions were determined to a resolution of 2.7 Å and contained two distinct populations; one I3 bound and two I3 molecules bound to the FAP dimer. In both cases, the sdAb bound a unique epitope that was distinct from the active site of the enzyme. Furthermore, this report describes the rational mutation of specific residues within the complementarity determining region 3 (CDR3) loop to enhance affinity and selectivity of the I3 molecule for FAP. This report represents the first sdAb-FAP structure to be described in the literature.
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2024年10月8日
登録サイト: RCSB / 処理サイト: RCSB
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2025年2月26日
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2025年2月26日
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2025年2月26日
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2025年2月26日
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