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2018 ; 115
(4
): 720-725
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Glycoengineering of antibody (Herceptin) through yeast expression and in vitro
enzymatic glycosylation
#MMPMID29311294
Liu CP
; Tsai TI
; Cheng T
; Shivatare VS
; Wu CY
; Wu CY
; Wong CH
Proc Natl Acad Sci U S A
2018[Jan]; 115
(4
): 720-725
PMID29311294
show ga
Monoclonal antibodies (mAbs) have been developed as therapeutics, especially for
the treatment of cancer, inflammation, and infectious diseases. Because the
glycosylation of mAbs in the Fc region influences their interaction with effector
cells that kill antibody-targeted cells, and the current method of antibody
production is relatively expensive, efforts have been directed toward the
development of alternative expressing systems capable of large-scale production
of mAbs with desirable glycoforms. In this study, we demonstrate that the mAb
trastuzumab expressed in glycoengineered P. pastoris can be remodeled through
deglycosylation by endoglycosidases identified from the Carbohydrate Active
Enzymes database and through transglycosylation using glycans with a stable
leaving group to generate a homogeneous antibody designed to optimize the
effector functions. The 10 newly identified recombinant bacterial
endoglycosidases are complementary to existing endoglycosidases (EndoA, EndoH,
EndoS), two of which can even accept sialylated tri- and tetraantennary glycans
as substrates.