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2015 ; 14
(4
): 974-88
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Unravelling glucan recognition systems by glycome microarrays using the designer
approach and mass spectrometry
#MMPMID25670804
Palma AS
; Liu Y
; Zhang H
; Zhang Y
; McCleary BV
; Yu G
; Huang Q
; Guidolin LS
; Ciocchini AE
; Torosantucci A
; Wang D
; Carvalho AL
; Fontes CM
; Mulloy B
; Childs RA
; Feizi T
; Chai W
Mol Cell Proteomics
2015[Apr]; 14
(4
): 974-88
PMID25670804
show ga
Glucans are polymers of d-glucose with differing linkages in linear or branched
sequences. They are constituents of microbial and plant cell-walls and involved
in important bio-recognition processes, including immunomodulation, anticancer
activities, pathogen virulence, and plant cell-wall biodegradation. Translational
possibilities for these activities in medicine and biotechnology are
considerable. High-throughput micro-methods are needed to screen proteins for
recognition of specific glucan sequences as a lead to structure-function studies
and their exploitation. We describe construction of a "glucome" microarray, the
first sequence-defined glycome-scale microarray, using a "designer" approach from
targeted ligand-bearing glucans in conjunction with a novel high-sensitivity mass
spectrometric sequencing method, as a screening tool to assign glucan recognition
motifs. The glucome microarray comprises 153 oligosaccharide probes with high
purity, representing major sequences in glucans. Negative-ion electrospray tandem
mass spectrometry with collision-induced dissociation was used for complete
linkage analysis of gluco-oligosaccharides in linear "homo" and "hetero" and
branched sequences. The system is validated using antibodies and
carbohydrate-binding modules known to target ?- or ?-glucans in different
biological contexts, extending knowledge on their specificities, and applied to
reveal new information on glucan recognition by two signaling molecules of the
immune system against pathogens: Dectin-1 and DC-SIGN. The sequencing of the
glucan oligosaccharides by the MS method and their interrogation on the
microarrays provides detailed information on linkage, sequence and chain length
requirements of glucan-recognizing proteins, and are a sensitive means of
revealing unsuspected sequences in the polysaccharides.