8Q5U

Endoglycosidase S2 in complex with IgG1 Fc

Summary for 8Q5U

• Entry DOI: 10.2210/pdb8q5u/pdb
• Descriptor: Uncharacterized protein DKFZp686C11235, Endo-beta-N-acetylglucosaminidase, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose, ... (8 entities in total)
• Functional Keywords: antibody, igg, fc, endoglycosidase s2, endos2, immune system
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 6
• Total formula weight: 358341.61

Authors

Sudol, A.S.L.,Tews, I.,Crispin, M. (deposition date: 2023-08-09, release date: 2024-04-17, Last modification date: 2024-10-09)

Primary citation

Sudol, A.S.L.,Crispin, M.,Tews, I.
The IgG-specific endoglycosidases EndoS and EndoS2 are distinguished by conformation and antibody recognition.
J.Biol.Chem., 300:107245-107245, 2024

PubMed Abstract: The IgG-specific endoglycosidases EndoS and EndoS2 from Streptococcus pyogenes can remove conserved N-linked glycans present on the Fc region of host antibodies to inhibit Fc-mediated effector functions. These enzymes are therefore being investigated as therapeutics for suppressing unwanted immune activation, and have additional application as tools for antibody glycan remodeling. EndoS and EndoS2 differ in Fc glycan substrate specificity due to structural differences within their catalytic glycosyl hydrolase domains. However, a chimeric EndoS enzyme with a substituted glycosyl hydrolase from EndoS2 loses catalytic activity, despite high structural homology between the two enzymes, indicating either mechanistic divergence of EndoS and EndoS2, or improperly-formed domain interfaces in the chimeric enzyme. Here, we present the crystal structure of the EndoS2-IgG1 Fc complex determined to 3.0 Å resolution. Comparison of complexed and unliganded EndoS2 reveals relative reorientation of the glycosyl hydrolase, leucine-rich repeat and hybrid immunoglobulin domains. The conformation of the complexed EndoS2 enzyme is also different when compared to the earlier EndoS-IgG1 Fc complex, and results in distinct contact surfaces between the two enzymes and their Fc substrate. These findings indicate mechanistic divergence of EndoS2 and EndoS. It will be important to consider these differences in the design of IgG-specific enzymes, developed to enable customizable antibody glycosylation.

PubMed: 38569940
DOI: 10.1016/j.jbc.2024.107245

Experimental method

X-RAY DIFFRACTION (3 Å)