Structural alterations in a component of cytochrome c oxidase and molecular evolution of pathogenic Neisseria in humans.
Three closely related bacterial species within the genus Neisseria are of importance to human disease and health. Neisseria meningitidis is a major cause of meningitis, while Neisseria gonorrhoeae is the agent of the sexually transmitted disease gonorrhea and Neisseria lactamica is a common, harmless commensal of children. Comparative genomics have yet to yield clear insights into which factors dictate the unique host-parasite relationships exhibited by each since, as a group, they display remarkable conservation at the levels of nucleotide sequence, gene content and synteny. Here, we discovered two rare alterations in the gene encoding the CcoP protein component of cytochrome cbb(3) oxidase that are phylogenetically informative. One is a single nucleotide polymorphism resulting in CcoP truncation that acts as a molecular signature for the species N. meningitidis. We go on to show that the ancestral ccoP gene arose by a unique gene duplication and fusion event and is specifically and completely distributed within species of the genus Neisseria. Surprisingly, we found that strains engineered to express either of the two CcoP forms conditionally differed in their capacity to support nitrite-dependent, microaerobic growth mediated by NirK, a nitrite reductase. Thus, we propose that changes in CcoP domain architecture and ensuing alterations in function are key traits in successive, adaptive radiations within these metapopulations. These findings provide a dramatic example of how rare changes in core metabolic proteins can be connected to significant macroevolutionary shifts. They also show how evolutionary change at the molecular level can be linked to metabolic innovation and its reversal as well as demonstrating how genotype can be used to infer alterations of the fitness landscape within a single host.
Aspholm
Marina
M
Department of Molecular Biosciences, University of Oslo, Oslo, Norway.
Aas
Finn Erik
FE
Harrison
Odile B
OB
Quinn
Diana
D
Vik
Ashild
A
Viburiene
Raimonda
R
Tønjum
Tone
T
Moir
James
J
Maiden
Martin C J
MC
Koomey
Michael
M
D001483:Base Sequence; D003576:Electron Transport Complex IV / Q000737:chemistry / Q000235:genetics*; D019143:Evolution, Molecular; D005838:Genotype; D006790:Host-Parasite Interactions / Q000235:genetics*; D006801:Humans; D015151:Immunoblotting; D008969:Molecular Sequence Data; D009343:Neisseria / Q000235:genetics*; D010641:Phenotype; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide
D003576:Electron Transport Complex IV
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