Abstract
A novel lectin specific to low-branched mannans (MBL-SN) was isolated from coelomic plasma of the sea urchin Strongylocentrotus nudus by combining anion-exchange liquid chromatography on DEAE Toyopearl 650 M, affinity chromatography on mannan-Sepharose and gel filtration on the Sephacryl S-200. The molecular mass of MBL-SN was estimated by sodium dodecyl sulphate polyacrylamide gel electrophoresis under non-reducing conditions to be about 34 kDa. MBL-SN was shown to be a dimer with two identical subunits of about 17 kDa. The native MBL-SN exists as a tetramer. The physico-chemical properties of MBL-SN indicate that it belongs to C-type mannan-binding lectins. The cDNA encoding MBL-SN was cloned from the total cDNA of S. nudus coelomocytes and encodes a 17-kDa protein of 144 amino acid residues that contains a single carbohydrate-recognition domain of C-type lectins. Prediction of the MBL-SN tertiary structure using comparative modelling revealed that MBL-SN is an α/β-protein with eight β-strands and two α-helices. Comparison of the MBL-SN model with available three-dimensional structures of C-type lectins revealed that they share a common fold pattern.








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Discover the latest articles and news from researchers in related subjects, suggested using machine learning.Abbreviations
- CEA:
-
Carcinoembryonic antigen
- CRD:
-
Carbohydrate-recognition domain
- CTL:
-
C-type lectin
- EDTA:
-
Ethylenediaminetetraacetic acid
- HEPES:
-
N-2-Hydroxyethylpiperazine-N-[2-ethanesulfonic] acid
- MBL-AJ:
-
Mannan-binding lectins from Apostichopus japonicus
- MBL-CJ:
-
Mannan-binding lectins from Cucumaria japonica
- MBL-SN:
-
Mannan-binding lectins from Strongylocentrotus nudus
- MBLs:
-
Mannan-binding lectins
- MES:
-
2-[N-Morpholino]ethanesulfonic acid
- TB-Ca2+ :
-
Tris buffer, containing 10 mM CaCl2 (0.01 M Tris–HCl, pH 7.5, 10 mM CaCl2)
- TBS-Ca2+ :
-
Tris-buffered saline, containing 10 mM CaCl2 (0.01 M Tris–HCl, pH 7.5, 0.15 M NaCl and 10 mM CaCl2)
- TBS-T:
-
Tris-buffered saline, containing 0.05 % Triton X-100
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Acknowledgments
We are thankful to Dr. Evgeniy L. Nazarenko (PIBOC, Russia) for the kindly loaned samples of mannans from marine bacteria.
Funding
This work was supported by the Russian Foundation for Basic Research (grant numbers 11-04-01778-a); the Eastern Branch Russian Academy of Sciences (09-III-A-05-150) and Russian Federation Government were supporting the scientific research conducted by leading scientists on the base of Russian Higher Education Institutions (contract no. 11.G34.31.0010). FEBRAS grant no. 12-III-A-05-059, and the Program of the Russian Academy of Science Presidium ‘‘Molecular and Cellular Biology’’ (grant no.12-I-P6-10).
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Bulgakov, A.A., Eliseikina, M.G., Kovalchuk, S.N. et al. Mannan-Binding Lectin of the Sea Urchin Strongylocentrotus nudus . Mar Biotechnol 15, 73–86 (2013). https://doi.org/10.1007/s10126-012-9460-5
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DOI: https://doi.org/10.1007/s10126-012-9460-5


