Related lectins from snowdrop and maize differ in their carbohydrate-binding specificity.

Related lectins from snowdrop and maize differ in their carbohydrate-binding specificity.
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来自雪花莲和玉米的相关凝集素在碳水化合物结合特异性上有所不同。

DOI:
10.1016/j.bbrc.2009.01.048
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发表时间:
2009-03-06
影响因子:
3.1
通讯作者:
Van Damme, Els J. M.
Van Damme, Els J. M.
中科院分区:
生物学4区
文献类型:
--
作者:
Fouquaert, Elke;Smith, David F.;Peumans, Willy J.;Proost, Paul;Balzarini, Jan;Savvides, Savvas N.;Van Damme, Els J. M.

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在玉米EST数据库中的测序揭示了与雪花莲(GNA)凝集素相关的蛋白质的表达,称为GNAmaize。GNAmaize在巴斯德毕赤酵母中的异源表达允许表征来自植物的第一个核质GNA同源物。GNAmaize是一种四聚体蛋白,与GNA具有64%的序列相似性。聚糖微阵列分析揭示了特异性的重要差异。与GNA强烈结合高甘露糖N-聚糖不同,来自玉米的凝集素几乎只与更复杂的聚糖反应。有趣的是,GNAmaize更喜欢含有β1-2 GlcNAc残基的复合聚糖。碳水化合物结合特性的明显差异伴随着抗HIV活性降低100倍。虽然GNA和GNAmaize的序列明显相关,但它们仅显示28%的序列同一性。我们的研究结果表明,GNA相关凝集素家族内的基因分歧导致碳水化合物结合特异性的变化,如N-聚糖阵列所示。
Searches in an EST database from maize revealed the expression of a protein related to the Galanthus nivalis (GNA) agglutinin, referred to as GNAmaize. Heterologous expression of GNAmaize in Pichia pastoris allowed characterisation of the first nucleocytoplasmic GNA homolog from plants. GNAmaize is a tetrameric protein which shares 64% sequence similarity with GNA. Glycan microarray analyses revealed important differences in the specificity. Unlike GNA, which binds strongly to high-mannose N-glycans, the lectin from maize reacts almost exclusively with more complex glycans. Interestingly, GNAmaize prefers complex glycans containing β1-2 GlcNAc residues. The obvious difference in carbohydrate-binding properties is accompanied by a 100-fold reduced anti-HIV activity. Although the sequences of GNA and GNAmaize are clearly related they show only 28% sequence identity. Our results indicate that gene divergence within the family of GNA-related lectins leads to changes in carbohydrate binding specificity, as shown on N-glycan arrays.
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