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Mannose binding lectin

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https://www.readbyqxmd.com/read/28813016/a-novel-high-mannose-specific-lectin-from-the-green-alga-halimeda-renschii-exhibits-a-potent-anti-influenza-virus-activity-through-high-affinity-binding-to-the-viral-hemagglutinin
#1
Jinmin Mu, Makoto Hirayama, Yuichiro Sato, Kinjiro Morimoto, Kanji Hori
We have isolated a novel lectin, named HRL40 from the green alga Halimeda renschii. In hemagglutination-inhibition test and oligosaccharide-binding experiment with 29 pyridylaminated oligosaccharides, HRL40 exhibited a strict binding specificity for high-mannose N-glycans having an exposed (α1-3) mannose residue in the D2 arm of branched mannosides, and did not have an affinity for monosaccharides and other oligosaccharides examined, including complex N-glycans, an N-glycan core pentasaccharide, and oligosaccharides from glycolipids...
August 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28803976/canavalia-bonariensis-lectin-molecular-bases-of-glycoconjugates-interaction-and-antiglioma-potential
#2
Benildo Sousa Cavada, Mayara Torquato Lima Silva, Vinicius Jose Silva Osterne, Vanir Reis Pinto-Junior, Ana Paula Machado do Nascimento, Ingrid Alessandra Victoria Wolin, Isabella Aparecida Heinrich, Clareane Avelino Simplicio Nobre, Cleane Gomes Moreira, Claudia Figueiredo Lossio, Cintia Renata Costa Rocha, Jorge Luiz Martins, Kyria Santiago Nascimento, Rodrigo Bainy Leal
CaBo is a mannose/glucose-specific lectin purified from seeds of Canavalia bonariensis. In the present work, we report the CaBo crystal structure determined to atomic resolution in the presence of X-man, a specific ligand. Similar to the structural characteristics of other legume lectins, CaBo presented the jellyroll motif, a metal binding site occupied by calcium and manganese ions close to the carbohydrate-recognition domain (CRD). In vitro test of CaBo cytotoxicity against glioma cells demonstrated its ability to decrease the cellular viability and migration by induction of autophagy and cell death...
August 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28794230/analysis-of-factor-d-isoforms-in-malpuech-michels-mingarelli-carnevale-patients-highlights-the-role-of-masp-3-as-a-maturase-in-the-alternative-pathway-of-complement
#3
Rasmus Pihl, Lisbeth Jensen, Annette G Hansen, Ida B Thøgersen, Stephanie Andres, Frederik Dagnæs-Hansen, Konrad Oexle, Jan J Enghild, Steffen Thiel
Factor D (FD), which is also known as adipsin, is regarded as the first-acting protease of the alternative pathway (AP) of complement. It has been suggested that FD is secreted as a mature enzyme that does not require subsequent activation. This view was challenged when it was shown that mice lacking mannose-binding lectin (MBL)-associated serine protease-1 (MASP-1) and MASP-3 contain zymogenic FD (pro-FD), and it is becoming evident that MASP-3 is implicated in pro-FD maturation. However, the necessity of MASP-3 for pro-FD cleavage has been questioned, because AP activity is still observed in sera from MASP-1/3-deficient Malpuech-Michels-Mingarelli-Carnevale (3MC) patients...
August 9, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28783370/association-between-polymorphisms-of-the-mannose-binding-lectin-and-severity-of-periportal-fibrosis-in-schistosomiasis-in-the-northeast-of-brazil
#4
Taynan da Silva Constantino, Elker Lene Santos de Lima, Lidiane Régia Pereira Braga de Brito, Jamile Luciana Silva, Maria Rosângela Cunha Duarte Coêlho, Maria Tereza Cartaxo Muniz, Paula Carolina Valença Silva, Ana Lúcia Coutinho Domingues
AIMS: Mannose-binding lectin (MBL) is a protein synthesized by the liver and its immune response is associated with the development of liver fibrosis. We hypothesized that the polymorphisms in the Exon 1 region (52, 54, 57) and promoter regions (-550 H/L, -221 X/Y) of the MBL2 gene were associated with the severity of periportal fibrosis (PPF), and that these polymorphisms affect the MBL serum levels. MATERIALS AND METHODS: In this cross-sectional study we genotyped these polymorphisms within the MBL2 gene in 229 Brazilian subjects infected with Schistosoma mansoni, with different patterns of PPF...
August 7, 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28743623/novel-mannose-binding-natterin-like-protein-in-the-skin-mucus-of-atlantic-cod-gadus-morhua
#5
Binoy Rajan, Deepti M Patel, Yoichiro Kitani, Kiron Viswanath, Monica F Brinchmann
This study presents the first report of purification of natterin-like protein (Nlp) in a non-venomous fish. The peptide identities of purified cod Nlp were confirmed through LC-MSMS and matched to a cod expressed sequence tag (EST). A partial cod nlp nucleotide sequence was amplified and sequenced based on this EST. Multiple sequence alignment of cod Nlp showed considerable homology with other teleost Nlps and the presence of an N-terminal jacalin-like lectin domain coupled with a C-terminal toxin domain. nlp expression was higher in skin, head kidney, liver and spleen than in other tissues studied...
July 22, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28739878/deconstructing-the-lectin-pathway-in-the-pathogenesis-of-experimental-inflammatory-arthritis-essential-role-of-the-lectin-ficolin-b-and-mannose-binding-protein-associated-serine-protease-2
#6
Nirmal K Banda, Sumitra Acharya, Robert I Scheinman, Gaurav Mehta, Minoru Takahashi, Yuichi Endo, Wuding Zhou, Conrad A Farrar, Steven H Sacks, Teizo Fujita, Hideharu Sekine, V Michael Holers
Complement plays an important role in the pathogenesis of rheumatoid arthritis. Although the alternative pathway (AP) is known to play a key pathogenic role in models of rheumatoid arthritis, the importance of the lectin pathway (LP) pattern recognition molecules such as ficolin (FCN) A, FCN B, and collectin (CL)-11, as well as the activating enzyme mannose-binding lectin-associated serine protease-2 (MASP-2), are less well understood. We show in this article that FCN A(-/-) and CL-11(-/-) mice are fully susceptible to collagen Ab-induced arthritis (CAIA)...
July 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28719181/differential-ligand-binding-specificities-of-the-pulmonary-collectins-are-determined-by-the-conformational-freedom-of-a-surface-loop
#7
Michael J Rynkiewicz, Huixing Wu, Tanya R Cafarella, Nikolaos M Nikolaidis, James F Head, Barbara A Seaton, Francis X McCormack
Lung surfactant proteins (SPs) play critical roles in surfactant function and innate immunity. SP-A and SP-D, members of the collectin family of C-type lectins, exhibit distinct ligand specificities, effects on surfactant structure, and host defense functions despite extensive structural homology. SP-A binds to dipalmitoylphosphatidylcholine (DPPC), the major surfactant lipid component, but not phosphatidylinositol (PI), whereas SP-D shows the opposite preference. Additionally, SP-A and SP-D recognize widely divergent pathogen-associated molecular patterns...
July 31, 2017: Biochemistry
https://www.readbyqxmd.com/read/28706259/genetic-polymorphisms-of-c-type-lectin-receptors-in-behcet-s-disease-in-a-chinese-han-population
#8
Yi Yang, Handan Tan, Bolin Deng, Hongsong Yu, Guannan Su, Jiayue Hu, Qingfeng Cao, Gangxiang Yuan, Aize Kijlstra, Peizeng Yang
C-type lectin receptors (CLRs) have been demonstrated to be involved in several autoimmune diseases. The role of CLRs in Behcet's disease (BD) is unknown and thus was the purpose of this study. A two-stage association study was carried out and a total of 766 BD patients and 1674 healthy controls were recruited. Genotyping of 14 SNPs of 13 genes in CLRs was carried out by iPLEX Gold genotyping or polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay. The expression of mannose binding lectin 2 (MBL2) and killer cell lectin like receptor C4 (KLRC4) was measured by Real-time PCR...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698271/mannose-binding-lectin-levels-could-predict-prognosis-in-iga-nephropathy
#9
Wei-Yi Guo, Li Zhu, Si-Jun Meng, Su-Fang Shi, Li-Jun Liu, Ji-Cheng Lv, Hong Zhang
IgA nephropathy (IgAN) is characterized by infections followed by episodic gross hematuria. Deficiency of mannose-binding lectin (MBL) is associated with recurrent infection in many diseases, but controversy exists regarding the role of MBL in IgAN. Here, we measured MBL2 variants and MBL levels in 749 patients with IgAN and 489 healthy controls. Overall, 5.2% (39 of 749) of patients with IgAN had MBL deficiency (MBL levels <100 ng/ml), among whom LYPB/LYPB and LXPA/LYPB were the predominant MBL2 haplotypes (82%; 32 of 39)...
July 11, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28693997/lectin-from-canavalia-villosa-seeds-a-glucose-mannose-specific-protein-and-a-new-tool-for-inflammation-studies
#10
Claudia F Lossio, Cleane G Moreira, Renata M F Amorim, Clareane S Nobre, Mayara T L Silva, Cornevile C Neto, Vanir R Pinto-Junior, Ivanice B Silva, Julia Campos, Ana Maria S Assreuy, Benildo S Cavada, Kyria S Nascimento
With important carbohydrate binding properties, lectins are proteins able to decipher the glycocode, and as such, they can be used in bioassays involving cell-cell communication, protein targeting, inflammation, and hypernociception, among others. In this study, a new glucose/mannose-specific lectin from Canavalia villosa seeds (Cvill) was isolated by a single affinity chromatography step in a Sephadex(®) G-50 column, with a purification yield of 19.35mg of lectin per gram of powdered seed. Analysis of intact protein by mass spectrometry showed the lectin is composed of three polypeptide chains, including a 25...
July 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28691652/migration-of-fasciola-hepatica-newly-excysted-juveniles-is-inhibited-by-high-mannose-and-oligomannose-type-n-glycan-binding-lectins
#11
Andres Garcia-Campos, Alan W Baird, Grace Mulcahy
Fasciola hepatica has both zoonotic importance and high economic impact in livestock worldwide. After ingestion by the definitive host, the Newly Excysted Juveniles (NEJ) penetrate the intestine before reaching the peritoneal cavity. The role of some NEJ-derived proteins in invasion has been documented, but the role of NEJ glycans or lectin-binding receptors during initial infection in the gut is still unknown. To address these questions, the migration of NEJ through rat intestine was recorded at 30 min intervals up to 150 min by two ex vivo methods...
July 10, 2017: Parasitology
https://www.readbyqxmd.com/read/28686979/high-mannose-n-glycan-binding-lectin-from-remusatia-vivipara-rvl-limits-cell-growth-motility-and-invasiveness-of-human-breast-cancer-cells
#12
B R Sindhura, Prajna Hegde, Vishwanath B Chachadi, Shashikala R Inamdar, Bale M Swamy
Breast cancer known for its high metastatic potential is responsible for large mortality rate amongst women; hence it is imperative to search for effective anti-metastatic molecules despite anticancer drugs. The current study describes the potential of Remusatia vivipara lectin (RVL), inducing apoptosis in breast cancer cells there by limiting motility and invasiveness. RVL binds to the cell surface glycans of MDA-MB-468 and MCF-7 cells, exhibiting strong glycan mediated cytotoxic effect, but show marginal effect on non-tumorigenic MCF-10A cells...
September 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28686880/chicken-mannose-binding-lectin-has-antiviral-activity-towards-infectious-bronchitis-virus
#13
Weidong Zhang, Kim M Bouwman, Steven J van Beurden, Soledad R Ordonez, Martin van Eijk, Henk P Haagsman, M Hélène Verheije, Edwin J A Veldhuizen
Mannose binding lectin (MBL) is a collagenous C-type lectin, which plays an important role in innate immunity. It can bind to carbohydrates on the surface of a wide range of pathogens, including viruses. Here we studied the antiviral effect of recombinant chicken (rc)MBL against Infectious Bronchitis Virus (IBV), a highly contagious coronavirus of chicken. rcMBL inhibited in a dose-dependent manner the infection of BHK-21 cells by IBV-Beaudette, as detected by immunofluorescence staining of viral proteins and qPCR...
September 2017: Virology
https://www.readbyqxmd.com/read/28684550/frutapin-a-lectin-from-artocarpus-incisa-breadfruit-cloning-expression-and-molecular-insights
#14
Felipe Domingos Sousa, Bruno Bezerra da Silva, Gilvan Pessoa Furtado, Igor de Sa Carneiro, Marina Duarte Pinto Lobo, Yiwei Guan, Jingxu Guo, Alun R Coker, Marcos Roberto Lourenzoni, Maria Izabel Florindo Guedes, James S Owen, David J Abraham, Ana Cristina de Oliveira Monteiro-Moreira, Renato de Azevedo Moreira
Artocarpus incisa (breadfruit) seeds contain three different lectins (Frutalin, Frutapin and Frutackin) with distinct carbohydrate specificities. The most abundant lectin is Frutalin, an α-D-galactose-specific carbohydrate-binding glycoprotein with antitumour properties and potential for tumour biomarker discovery as already reported. Frutapin (FTP) is the second most abundant, but proved difficult to purify with very low yields and contamination with Frutalin frustrating its characterization. Here, we report for the first time high-level production and isolation of biologically-active recombinant FTP in E...
July 6, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28678436/exploring-the-influence-of-shapes-and-heterogeneity-of-glyco-gold-nanoparticles-on-bacterial-binding-for-preventing-infections
#15
Suraj Toraskar, Madhuri Gade, Sivakoti Sangabathuni, Hirekodathakallu V Thulasiram, Raghavendra Kikkeri
To investigate the effects of the heterogeneity and shape of glyco-nanoprobes on carbohydrate-protein interactions (CPIs), α-d-mannose- and β-d-galactose-linked homo- and heterogeneous glycodendrons were synthesized and immobilized on spherical and rod-shaped gold nanoparticles (AuNPs). Lectin and bacterial binding studies of these glyco-AuNPs clearly illustrate that multivalency and shape of AuNPs contribute significantly to CPIs than the heterogeneity of glycodendrons. Finally, bacterial infection of HeLa cells was effectively inhibited by the homogeneous glycodendron-conjugated rod-shaped AuNPs relative to their heterogeneous counterparts...
July 5, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28676742/complement-components-showed-a-time-dependent-local-expression-pattern-in-constant-and-acute-white-light-induced-photoreceptor-damage
#16
Nicole Schäfer, Antje Grosche, Sabrina I Schmitt, Barbara M Braunger, Diana Pauly
Background: Photoreceptor cell death due to extensive light exposure and induced oxidative-stress are associated with retinal degeneration. A correlated dysregulation of the complement system amplifies the damaging effects, but the local and time-dependent progression of this mechanism is not thoroughly understood. Methods: Light-induced photoreceptor damage (LD) was induced in Balb/c mice with white light illumination either for 24 h with 1000 lux (constant model) or 0.5 h with 5000 lux (acute model). Complement protein and mRNA expression levels were compared at 1 and 3 days post-LD for C1s, complement factor B (CFB), mannose binding lectin A, mannose-binding protein-associated serine protease 1 (MASP-1), C3, C4, C9, and complement factor P in retina and RPE/choroid...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28673381/biomarkers-of-necrotising-soft-tissue-infections-aspects-of-the-innate-immune-response
#17
Marco Bo Hansen
Necrotising soft tissue infection (NSTI) is a life-threatening and rapidly progressing bacterial infection involving one or more layers of the soft tissue compartments causing necrosis. The amputation and mortality rates remain high despite increased focus on the patients. Timely treatment, including surgical intervention, reduces the risk of severe disability and death. However, the lack of pathognomonic signs impedes early diagnosis and treatment. Moreover, the rarity of the disease makes it difficult to conduct large prospective studies, thus prospective research is almost non-existent in this group of patients...
July 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28671968/systemic-complement-activation-in-central-serous-chorioretinopathy
#18
Elon H C van Dijk, Roula Tsonaka, Ngaisah Klar-Mohamad, Diana Wouters, Aiko P J de Vries, Eiko K de Jong, Cees van Kooten, Camiel J F Boon
PURPOSE: A clear link between several variants in genes involved in the complement system and chronic central serous chorioretinopathy (CSC) has been described. In age-related macular degeneration, a disease that shows clinical features that overlap with CSC, both genetic risk factors and systemic activation of the complement system have previously been found. In this case-control study, we assessed whether there is evidence of either systemic activation or inhibition of the complement system in patients with chronic CSC...
2017: PloS One
https://www.readbyqxmd.com/read/28665310/artinm-mediates-murine-t-cell-activation-and-induces-cell-death-in-jurkat-human-leukemic-t-cells
#19
Thiago Aparecido da Silva, Patrícia Kellen Martins Oliveira-Brito, Thiago Eleutério Gonçalves, Patrícia Edivânia Vendruscolo, Maria Cristina Roque-Barreira
The recognition of cell surface glycans by lectins may be critical for the innate and adaptive immune responses. ArtinM, a d-mannose-binding lectin from Artocarpus heterophyllus, activates antigen-presenting cells by recognizing TLR2 N-glycans and induces Th1 immunity. We recently demonstrated that ArtinM stimulated CD4⁺ T cells to produce proinflammatory cytokines. Here, we further studied the effects of ArtinM on adaptive immune cells. We showed that ArtinM activates murine CD4⁺ and CD8⁺ T cells, augmenting their positivity for CD25, CD69, and CD95 and showed higher interleukin (IL)-2 and interferon (IFN)-γ production...
June 30, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28652405/mechanism-of-pathogen-recognition-by-human-dectin-2
#20
Hadar Feinberg, Sabine A F Jégouzo, Maximus J Rex, Kurt Drickamer, William I Weis, Maureen E Taylor
Dectin-2, a C-type lectin on macrophages and other cells of the innate immune system, functions in response to pathogens, particularly fungi. The carbohydrate-recognition domain (CRD) in dectin-2 is linked to a transmembrane sequence that interacts with the common Fc receptor γ subunit to initiate immune signaling. The molecular mechanism by which dectin-2 selectively binds to pathogens has been investigated by characterizing the CRD expressed in a bacterial system. Competition binding studies indicated that the CRD binds to monosaccharides with modest affinity and that affinity was greatly enhanced for mannose-linked α1-2 or α1-4 to a second mannose residue...
August 11, 2017: Journal of Biological Chemistry
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