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2015 ; 13
(ä): 33
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Characterization and applications of Nanobodies against human procalcitonin
selected from a novel naïve Nanobody phage display library
#MMPMID25944262
Yan J
; Wang P
; Zhu M
; Li G
; Romão E
; Xiong S
; Wan Y
J Nanobiotechnology
2015[May]; 13
(ä): 33
PMID25944262
show ga
BACKGROUND: Nanobodies (Nbs) are single-domain antigen-binding fragments derived
from the camelids heavy-chain only antibodies (HCAbs). Their unique advantageous
properties make Nbs highly attractive in various applications. The general
approach to obtain Nbs is to isolate them from immune libraries by phage display
technology. However, it is unfeasible when the antigens are toxic, lethal,
transmissible or of low immunogenicity. Naïve libraries could be an alternative
way to solve the above problems. RESULTS: We constructed a large camel naïve
phage display Nanobody (Nb) library with great diversity. The generated library
contains to 6.86?×?10(11) clones and to our best of knowledge, this is the
biggest naïve phage display Nb library. Then Nbs against human procalcitonin
(PCT) were isolated from this library. These Nbs showed comparable affinity and
antigen-binding thermostability at 37°C and 60°C compared to the PCT Nbs from an
immune phage-displayed library. Furthermore, two PCT Nbs that recognize unique
epitopes on PCT have been successfully applied to develop a sandwich
enzyme-linked immunosorbent assay (ELISA) to detect PCT, which showed a linear
working range from 10-1000 ng/mL of PCT. CONCLUSION: We have constructed a large
and diverse naïve phage display Nb library, which potentially functioning as a
good resource for selecting antigen-binders with high quality. Moreover,
functional Nbs against PCT were successfully characterized and applied, providing
great values on medical application.