3ir1
Crystal Structure of Lipoprotein GNA1946 from Neisseria meningitidis
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedGNA1946, a conserved outer membrane lipoprotein from Neisseria meningitidis, has been identified as a candidate antigen for an urgently needed broad-spectrum meningococcal vaccine. It has been predicted to be a periplasmic receptor in the D-methionine uptake ABC transporter system. The crystal structure of GNA1946 was solved by the single-wavelength anomalous dispersion (SAD) method to a resolution of 2.25 A, and it reveals a Venus flytrap-like structure. GNA1946 consists of two globular lobes connected by a hinge region. Surprisingly, the structure showed an L-methionine bound within the cleft between the lobes. A comparison of GNA1946 with two other outer membrane lipoproteins, the L-methionine-binding Tp32 from Treponema pallidum and the dipeptide GlyMet-binding protein Pg110 from Staphylococcus aureus, revealed that although these three proteins share low sequence similarities, there is a high degree of structural conservation and similar substrate-binding frameworks. Our results reveal that GNA1946 is an L-methionine binding lipoprotein in the outer membrane, and should function as an initial receptor for ABC transporters with high affinity and specificity. The GNA1946 structure reported here should provide a valuable starting point for the development of a broad-spectrum meningococcal vaccine. Crystal structure of lipoprotein GNA1946 from Neisseria meningitidis.,Yang X, Wu Z, Wang X, Yang C, Xu H, Shen Y J Struct Biol. 2009 Dec;168(3):437-43. Epub 2009 Sep 3. PMID:19733245[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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