ISDA

Entry Detail

PDB ID:

9C7D

Keywords:

IMMUNE SYSTEM

Title:

Human monoclonal antibody MAD22-38 bound to the N-terminus of cleaved circumsporozoite protein

Biological Source:

Source Organism:

Homo sapiens, Plasmodium falciparum 3D7

Host Organism:

Cricetulus griseus

PDB Version:

Deposition Date:

2024-06-10

Release Date:

2024-12-25

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.99 Å

R-Value Free:

0.23

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Circumsporozoite protein
Chain IDs:C (auth: B)
Chain Length:18
Number of Molecules:1
Biological Source:Plasmodium falciparum 3D7

UniProt ID:Q7K740

Polymer Type:polypeptide(L)
Description:Monoclonal antibody MAD22-38 Fab Heavy Chain
Chain IDs:A (auth: H)
Chain Length:227
Number of Molecules:1
Biological Source:Homo sapiens

Polymer Type:polypeptide(L)
Description:Monoclonal antibody MAD22-38 Fab Light Chain
Chain IDs:B (auth: L)
Chain Length:213
Number of Molecules:1
Biological Source:Homo sapiens

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
PCA	C	GLN	modified residue

Primary Citation

Protective antibodies target cryptic epitope unmasked by cleavage of malaria sporozoite protein.

Dacon, C, Moskovitz, R, Swearingen, K, Da Silva Pereira, L, Flores-Garcia, Y, Aleshnick, M, Kanatani, S, Flynn, B, Molina-Cruz, A, Wollenberg, K, Traver, M, Kirtley, P, Purser, L, Dillon, M, Bonilla, B, Franco, A, Petros, S, Kritzberg, J, Tucker, C, Paez, G.G, Gupta, P, Shears, M.J, Pazzi, J, Edgar, J.M, Teng, A.A, Belmonte, A, Oda, K, Doumbo, S, Krymskaya, L, Skinner, J, Li, S, Ghosal, S, Kayentao, K, Ongoiba, A, Vaughan, A, Campo, J.J, Traore, B, Barillas-Mury, C, Wijayalath, W, Idris, A, Crompton, P.D, Sinnis, P, Wilder, B.K, Zavala, F, Seder, R.A, Wilson, I.A, Tan, J.Show

Science 387 eadr0510 eadr0510 (2025)

PMID: 39745947 DOI: 10.1126/science.adr0510

Abstact

The most advanced monoclonal antibodies (mAbs) and vaccines against malaria target the central repeat region or closely related sequences within the Plasmodium falciparum circumsporozoite protein (PfCSP). Here, using an antigen-agnostic strategy to investigate human antibody responses to whole sporozoites, we identified a class of mAbs that target a cryptic PfCSP epitope that is only exposed after cleavage and subsequent pyroglutamylation (pGlu) of the newly formed N terminus. This pGlu-CSP epitope is not targeted by current anti-PfCSP mAbs and is not included in the licensed malaria vaccines. MAD21-101, the most potent mAb in this class, confers sterile protection against Pf infection in a human liver-chimeric mouse model. These findings reveal a site of vulnerability on the sporozoite surface that can be targeted by next-generation antimalarial interventions.

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Primary Citation of related structures