6EUP

Crystal structure of Neisseria meningitidis NadA variant 3 double mutant A33I-I38L

6EUP の概要

• エントリーDOI: 10.2210/pdb6eup/pdb
• 関連するPDBエントリー: 6EUN
• 分子名称: Adhesin A, CHLORIDE ION, 1,2-ETHANEDIOL, ... (7 entities in total)
• 機能のキーワード: trimeric autotransporter adhesin, antigen, double mutant, cell adhesion
• 由来する生物種: Neisseria meningitidis
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 52862.38

構造登録者

Dello Iacono, L.,Liguori, A.,Malito, E.,Bottomley, M.J. (登録日: 2017-10-31, 公開日: 2018-10-10, 最終更新日: 2024-05-08)

主引用文献

Liguori, A.,Dello Iacono, L.,Maruggi, G.,Benucci, B.,Merola, M.,Lo Surdo, P.,Lopez-Sagaseta, J.,Pizza, M.,Malito, E.,Bottomley, M.J.
NadA3 Structures Reveal Undecad Coiled Coils and LOX1 Binding Regions Competed by Meningococcus B Vaccine-Elicited Human Antibodies.
MBio, 9:-, 2018

PubMed Abstract: serogroup B (MenB) is a major cause of sepsis and invasive meningococcal disease. A multicomponent vaccine, 4CMenB, is approved for protection against MenB. Neisserial adhesin A (NadA) is one of the main vaccine antigens, acts in host cell adhesion, and may influence colonization and invasion. Six major genetic variants of NadA exist and can be classified into immunologically distinct groups I and II. Knowledge of the crystal structure of the 4CMenB vaccine component NadA3 (group I) would improve understanding of its immunogenicity, folding, and functional properties and might aid antigen design. Here, X-ray crystallography, biochemical, and cellular studies were used to deeply characterize NadA3. The NadA3 crystal structure is reported; it revealed two unexpected regions of undecad coiled-coil motifs and other conformational differences from NadA5 (group II) not predicted by previous analyses. Structure-guided engineering was performed to increase NadA3 thermostability, and a second crystal structure confirmed the improved packing. Functional NadA3 residues mediating interactions with human receptor LOX-1 were identified. Also, for two protective vaccine-elicited human monoclonal antibodies (5D11, 12H11), we mapped key NadA3 epitopes. These vaccine-elicited human MAbs competed binding of NadA3 to LOX-1, suggesting their potential to inhibit host-pathogen colonizing interactions. The data presented provide a significant advance in the understanding of the structure, immunogenicity and function of NadA, one of the main antigens of the multicomponent meningococcus B vaccine. The bacterial microbe serogroup B (MenB) is a major cause of devastating meningococcal disease. An approved multicomponent vaccine, 4CMenB, protects against MenB. Neisserial adhesin A (NadA) is a key vaccine antigen and acts in host cell-pathogen interactions. We investigated the 4CMenB vaccine component NadA3 in order to improve the understanding of its immunogenicity, structure, and function and to aid antigen design. We report crystal structures of NadA3, revealing unexpected structural motifs, and other conformational differences from the NadA5 orthologue studied previously. We performed structure-based antigen design to engineer increased NadA3 thermostability. Functional NadA3 residues mediating interactions with the human receptor LOX-1 and vaccine-elicited human antibodies were identified. These antibodies competed binding of NadA3 to LOX-1, suggesting their potential to inhibit host-pathogen colonizing interactions. Our data provide a significant advance in the overall understanding of the 4CMenB vaccine antigen NadA.

PubMed: 30327444
DOI: 10.1128/mBio.01914-18

実験手法

X-RAY DIFFRACTION (2.65 Å)