Abstract
A divalent cation-independent 16 kDa d-galactose binding lectin (AKL-2) was isolated from eggs of sea hare, Aplysia kurodai. The lectin recognized d-galactose and d-galacturonic acid and had a 32 kDa dimer consisting of two disulfide-bonded 16 kDa subunits. Eighteen N-terminus amino acids were identified by Edman degradation, having unique primary structure. Lectin blotting analysis with horseradish peroxidase-conjugated lectins has shown that AKL-2 was a glycoprotein with complex type oligosaccharides with N-acetyl d-glucosamine and mannose at non-reducing terminal. Two protein bands with 38 and 36 kDa in the crude extract of sea hare eggs after purification of the lectin was isolated by AKL-2-conjugated Sepharose column and elution with 0.1 M lactose containing buffer. It suggested that the lectin binds with an endogenous ligand in the eggs. AKL-2 kept extreme stability on haemagglutination activity if it was treated at pH 3 and 70 °C for 1 h. Glycan binding profile of AKL-2 by frontal affinity chromatography technology using 15 pyridylamine labeled oligosaccharides has been appeared that the lectin uniquely recognized globotriose (Galα1-4Galβ1-4Glc; Gb3) in addition to bi-antennary complex type N-linked oligosaccharides with N-acetyllactosamine. Surface plasmon resonance analysis of AKL-2 against a neo-glycoprotein, Gb3-human serum albumin showed the k ass and k diss values are 2.4 × 103 M−1 s−1 and 3.8 × 10−3 s−1, respectively. AKL-2 appeared cytotoxicity against both Burkitt’s lymphoma Raji cell and erythroleukemia K562. The activity to Raji by the lectin was preferably cancelled by the co-presence of melibiose mimicing Gb3. On the other hand, K562 was cancelled effectively by lactose than melibiose. It elucidated that AKL-2 had cytotoxic ability mediated glycans structure to cultured cells.
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Abbreviations
- AKL:
-
Sea hare (Aplysia kurodai) eggs lectin
- ASF:
-
Asialofetuin
- BSM:
-
Bovine submaxillary mucin
- ConA:
-
Concanavalin A
- FACT:
-
Frontal affinity chromatography technology
- Gb3:
-
Globotriose (Galα1-4Galβ1-4Glc)
- GPC:
-
Gel permeation chromatography
- PA:
-
Pyridylamine
- PSM:
-
Porcine stomach mucin
- PVDF:
-
Polyvinyllidene difluoride
- SPR:
-
Surface plasmon resonance
- WGA:
-
Wheat germ agglutinin
- WST-8:
-
2-(2-methoxy-4-nitrophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophhenyl)-2H-tetrazolium, monosodium salt
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Acknowledgments
This work was supported in part by a Grant-In-Aid for scientific research (No. 1021009100 and 22580226) from the Japan Society for the Promotion of Science (JSPS), Japanese Association for Marine Biology (JAMBIO, Project No.23-04) from Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan and Strategic Research Project (No. G2307) from Yokohama City University (YCU).
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Sarkar M. A. Kawsar and Ryo Matsumoto is equal contribution as the first author.
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Kawsar, S.M.A., Matsumoto, R., Fujii, Y. et al. Cytotoxicity and Glycan-Binding Profile of a d-Galactose-Binding Lectin from the Eggs of a Japanese Sea Hare (Aplysia kurodai). Protein J 30, 509–519 (2011). https://doi.org/10.1007/s10930-011-9356-7
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DOI: https://doi.org/10.1007/s10930-011-9356-7