Abstract
A lectin was purified from Japanese sea hare Aplysia kurodai by lactosyl-agarose affinity chromatography. The molecular mass of the lectin was determined to be 56 and 32 kDa by SDS-PAGE under non-reducing and reducing conditions, respectively. It was found to agglutinate trypsinized and glutaraldehyde-fixed rabbit and human erythrocytes in the absence of divalent cations. The lectin exhibited stable thermo-tolerance as it retained hemagglutinating activity for 1 h even at 80°C and showed stability at pH 10. By contrast, it was very sensitive at pH less than 5 and in the presence of the sulfhydryl-group preserving reagent, β-mercaptoethanol. The hemagglutinating activity by the lectin was specifically inhibited by D-galactose, galacturonic acid, methyl-α- and methyl-β-D-galactopyranoside, lactose, melibiose, and asialofetuin. The association rate constant (k ass) and dissociation rate constant (k diss) were determined for the lectin to be 4.3·105 M−1·sec−1 and 2.2·10−3 sec−1, respectively, using a surface plasmon resonance biosensor. The lectin moderately inhibited cell proliferation in the P388 cell line dose dependently. Interestingly, lectin-treated cells did not show a fragmented DNA ladder as is caused by apoptosis, suggesting that the cell proliferation inhibition was caused by another unknown mechanism.
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Abbreviations
- AGL:
-
Aplysia depilans gonad lectin
- AKL:
-
Aplysia kurodai egg lectin
- BCA:
-
bicinchoninic acid
- BSA:
-
bovine serum albumin
- Con A:
-
concanavalin A
- EDC:
-
1-ethyl-3-(3-dimethylamino-propyl)carbodiimide
- HOL:
-
Halichondria okadai lectin
- NHS:
-
N-hydroxysuccinimide
- RCA:
-
Ricin communis agglutinin
- SBL:
-
sialic acid binding lectin
- SPR:
-
surface plasmon resonance
- TBS:
-
Tris-buffered saline containing 150 mM NaCl, pH 7.4
- WGA:
-
wheat germ agglutinin
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Published in Russian in Biokhimiya, 2009, Vol. 74, No. 7, pp. 877–885.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM08-299, April 12, 2009.
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Kawsar, S.M.A., Matsumoto, R., Fujii, Y. et al. Purification and biochemical characterization of a D-galactose binding lectin from Japanese sea hare (Aplysia kurodai) eggs. Biochemistry Moscow 74, 709–716 (2009). https://doi.org/10.1134/S0006297909070025
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DOI: https://doi.org/10.1134/S0006297909070025