Binding of the Bacterial Adhesin FimH to Its Natural, Multivalent High-Mannose Type Glycan Targets

2018 ◽  
Vol 141 (2) ◽  
pp. 936-944 ◽  
Author(s):  
Maximilian M. Sauer ◽  
Roman P. Jakob ◽  
Thomas Luber ◽  
Fabia Canonica ◽  
Giulio Navarra ◽  
...  
Keyword(s):  
High Mannose ◽  
Bacterial Adhesin

The Influence of Carbohydrate Structure on the Clearance of Recombinant Tissue-Type Plasminogen Activator

1988 ◽  
Vol 60 (02) ◽  
pp. 255-261 ◽  
Author(s):  
A Hotchkiss ◽  
C J Refino ◽  
C K Leonard ◽  
J V O'Connor ◽  
C Crowley ◽  
...  
Keyword(s):  
Amino Acid ◽  
Plasminogen Activator ◽  
Sodium Periodate ◽  
Glycosylation Site ◽  
Tissue Type ◽  
Carbohydrate Structure ◽  
Tissue Type Plasminogen Activator ◽  
Type Plasminogen Activator ◽  
High Mannose ◽  
Oligosaccharide Structures

SummaryModification of the carbohydrate structures of recombinant tissue-type plasminogen activator (rt-PA) can increase or decrease its rate of clearance in rabbits. When rt-PA was treated with sodium periodate to oxidize carbohydrate residues, the rate of clearance was decreased from 9.6 ± 1.9 ml min−1 kg−1 to 3.5 ± 0.6 ml min−1 kg−1 (mean ± SD, n = 5). A similar change in the clearance of rt-PA was introduced by the use of endo-β-N-acetyl- glucosaminidase H (Endo-H), which selectively removes high mannose asparagine-linked oligosaccharides; the clearance of Endo-H-treated rt-PA was 5.0 ± 0.5 ml min−1 kg−1. A mutant of rt-PA was produced with an amino acid substitution at position 117 (Asn replaced with Gin) to remove a potential glycosylation site that normally contains a high mannose structure. The clearance of this material was also decreased, similar to the periodate and Endo-H-treated rt-PA. Conversely, when rt-PA was produced in the CHO 15B cell line, which can produce only high mannose oligosaccharide structures on glycoproteins, the clearance was increased by a factor of 1.8. These results demonstrate that the removal of rt-PA from the blood depends significantly upon the nature of its oligosaccharide structures.

scholarly journals BanLec-eGFP Chimera as a Tool for Evaluation of Lectin Binding to High-Mannose Glycans on Microorganisms

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 180
Author(s):  
Zorana Lopandić ◽  
Luka Dragačević ◽  
Dragan Popović ◽  
Uros Andjelković ◽  
Rajna Minić ◽  
...  
Keyword(s):  
Fluorescent Protein ◽  
Lectin Binding ◽  
Three Dimensional ◽  
Data Bank ◽  
Salmonella Typhi ◽  
Excitation Wavelength ◽  
Protein Data Bank Entry ◽  
High Mannose

Fluorescently labeled lectins are useful tools for in vivo and in vitro studies of the structure and function of tissues and various pathogens such as viruses, bacteria, and fungi. For the evaluation of high-mannose glycans present on various glycoproteins, a three-dimensional (3D) model of the chimera was designed from the crystal structures of recombinant banana lectin (BanLec, Protein Data Bank entry (PDB): 5EXG) and an enhanced green fluorescent protein (eGFP, PDB 4EUL) by applying molecular modeling and molecular mechanics and expressed in Escherichia coli. BanLec-eGFP, produced as a soluble cytosolic protein of about 42 kDa, revealed β-sheets (41%) as the predominant secondary structures, with the emission peak maximum detected at 509 nm (excitation wavelength 488 nm). More than 65% of the primary structure was confirmed by mass spectrometry. Competitive BanLec-eGFP binding to high mannose glycans of the influenza vaccine (Vaxigrip®) was shown in a fluorescence-linked lectin sorbent assay (FLLSA) with monosaccharides (mannose and glucose) and wild type BanLec and H84T BanLec mutant. BanLec-eGFP exhibited binding to mannose residues on different strains of Salmonella in flow cytometry, with especially pronounced binding to a Salmonella Typhi clinical isolate. BanLec-eGFP can be a useful tool for screening high-mannose glycosylation sites on different microorganisms.

Evidence that specific high mannose structures directly regulate multiple cellular activities

1991 ◽  
Vol 102 (2) ◽  
Author(s):  
Neeraja Sathyamoorthy ◽  
JeanM. Decker ◽  
AnneP. Sherblom ◽  
Andrew Muchmore
Keyword(s):  
High Mannose

Identification of high-mannose and multiantennary complex-type N-linked glycans containing α-galactose epitopes from Nurse shark IgM heavy chain

2009 ◽  
Vol 26 (8) ◽  
pp. 1055-1064 ◽  
Author(s):  
David J. Harvey ◽  
Max Crispin ◽  
Beryl E. Moffatt ◽  
Sylvia L. Smith ◽  
Robert B. Sim ◽  
...  
Keyword(s):  
Heavy Chain ◽  
Complex Type ◽  
Nurse Shark ◽  
High Mannose
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