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2015 ; 87
(22
): 11383-8
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Quantification of Borrelia burgdorferi Membrane Proteins in Human Serum: A New
Concept for Detection of Bacterial Infection
#MMPMID26491962
Cheung CS
; Anderson KW
; Benitez KY
; Soloski MJ
; Aucott JN
; Phinney KW
; Turko IV
Anal Chem
2015[Nov]; 87
(22
): 11383-8
PMID26491962
show ga
The Borrelia burgdorferi spirochete is the causative agent of Lyme disease, the
most common tick-borne disease in the United States. The low abundance of
bacterial proteins in human serum during infection imposes a challenge for early
proteomic detection of Lyme disease. To address this challenge, we propose to
detect membrane proteins released from bacteria due to disruption of their plasma
membrane triggered by the innate immune system. These membrane proteins can be
separated from the bulk of serum proteins by high-speed centrifugation causing
substantial sample enrichment prior to targeted protein quantification using
multiple reaction monitoring mass spectrometry. This new approach was first
applied to detection of B. burgdorferi membrane proteins supplemented in human
serum. Our results indicated that detection of B. burgdorferi membrane proteins,
which are ?10(7) lower in abundance than major serum proteins, is feasible.
Therefore, quantitative analysis was also carried out for serum samples from
three patients with acute Lyme disease. We were able to demonstrate the detection
of ospA, the major B. burgdorferi lipoprotein at the level of 4.0 fmol of ospA/mg
of serum protein. The results confirm the concept and suggest that the proposed
approach can be expanded to detect other bacterial infections in humans,
particularly where existing diagnostics are unreliable.