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8ujg

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X-ray crystal structure of Toxoplasma gondii GalNAc-T3 in complex with UDP-GalNAc, Mn2+, and the mono-glycopeptide Srs13.2

Structural highlights

8ujg is a 3 chain structure with sequence from Toxoplasma gondii and Toxoplasma gondii ME49. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.27Å
Ligands:	, , , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Publication Abstract from PubMed

Infection with the apicomplexan protozoan Toxoplasma gondii can be life-threatening in immunocompromised hosts. Transmission frequently occurs through the oral ingestion of T. gondii bradyzoite cysts, which transition to tachyzoites, disseminate, and then form cysts containing bradyzoites in the central nervous system, resulting in latent infection. Encapsulation of bradyzoites by a cyst wall is critical for immune evasion, survival, and transmission. O-glycosylation of the protein CST1 by the mucin-type O-glycosyltransferase T. gondii (Txg) GalNAc-T3 influences cyst wall rigidity and stability. Here, we report X-ray crystal structures of TxgGalNAc-T3, revealing multiple features that are strictly conserved among its apicomplexan homologues. This includes a unique 2(nd) metal that is coupled to substrate binding and enzymatic activity in vitro and cyst wall O-glycosylation in T. gondii. The study illustrates the divergence of pathogenic protozoan GalNAc-Ts from their host homologues and lays the groundwork for studying apicomplexan GalNAc-Ts as therapeutic targets in disease.

A Toxoplasma gondii O-glycosyltransferase that modulates bradyzoite cyst wall rigidity is distinct from host homologues.,Kumar P, Tomita T, Gerken TA, Ballard CJ, Lee YS, Weiss LM, Samara NL Nat Commun. 2024 May 6;15(1):3792. doi: 10.1038/s41467-024-48253-w. PMID:38710711^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Kumar P, Tomita T, Gerken TA, Ballard CJ, Lee YS, Weiss LM, Samara NL. A Toxoplasma gondii O-glycosyltransferase that modulates bradyzoite cyst wall rigidity is distinct from host homologues. Nat Commun. 2024 May 6;15(1):3792. PMID:38710711 doi:10.1038/s41467-024-48253-w