9U4E

Cryo-EM structure of the human CRP-CPS23F complex

This is a non-PDB format compatible entry.

Summary for 9U4E

• Entry DOI: 10.2210/pdb9u4e/pdb
• EMDB information: 63844
• Descriptor: C-reactive protein, alpha-L-rhamnopyranose-(1-2)-1,3-bis(oxidanyl)propan-2-yl [(2~{R},3~{S},4~{S},5~{R})-2-(hydroxymethyl)-3,5,6-tris(oxidanyl)oxan-4-yl] hydrogen phosphate-(1-4)-beta-L-rhamnopyranose-(1-4)-beta-D-glucopyranose, CALCIUM ION (3 entities in total)
• Functional Keywords: complex, pentamer, anti-bacterial immunity, immune system
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 5
• Total formula weight: 129651.34

Authors

Chen, D.Y.,Xie, Y.F.,Gao, F.,Qi, J.X.,Zhang, J.R. (deposition date: 2025-03-19, release date: 2025-09-24, Last modification date: 2026-04-08)

Primary citation

Chen, D.,Hu, J.,Zhu, M.,Xie, Y.,Yao, H.,An, H.,Meng, Y.,Wang, J.,Huang, X.,Liu, Y.,Shao, Z.,Xiang, Y.,Qi, J.,Gao, G.F.,Zhang, J.R.
C-reactive protein is a broad-spectrum capsule-binding receptor for hepatic capture of blood-borne bacteria.
Embo J., 44:7364-7394, 2025

PubMed Abstract: Plasma C-reactive protein (CRP) is widely used as a biomarker for bacterial infections due to its massive induction during infections. However, the biological function of CRP remains largely undefined. Here we show that CRP enables liver resident macrophages (Kupffer cells) to capture and eliminate a wide range of invasive bacteria from the bloodstream of mice, and thereby provides rapid and sterilizing immunity. Mechanistically, CRP binds to at least 20 capsule types of Gram-positive and -negative pathogens, and shuffles the encapsulated bacteria to Kupffer cells embedded in the lining of the liver sinusoidal vasculatures by the complement-dependent and -independent pathways. The complement-dependent mode involves the activation of complement C3 at the bacterial surface, and the capture of the C3-opsonized bacteria by the CRIg and CR3 complement receptors on Kupffer cells. Cryo-electron microscopy analysis revealed a flexible structural framework for CRP's recognition of structurally diverse capsular polysaccharides. Because human CRP also possesses the broad capsule-binding activities, our findings provide a biological reason for the massive rise of plasma CRP during bacterial infections.

PubMed: 41214213
DOI: 10.1038/s44318-025-00623-w

Experimental method

ELECTRON MICROSCOPY (2.78 Å)