The alpha 1-->3 fucosylation at the penultimate GlcNAc catalyzed by fucosyltransferase VII is blocked by internally fucosylated residue in sialosyl long-chain poly-LacNAc: enzymatic basis for expression of physiological E-selectin epitope.

The alpha 1-->3 fucosylation at the penultimate GlcNAc catalyzed by fucosyltransferase VII is blocked by internally fucosylated residue in sialosyl long-chain poly-LacNAc: enzymatic basis for expression of physiological E-selectin epitope.
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由岩藻糖基转移酶 VII 催化的倒数第二个 GlcNAc 处的 α1→3 岩藻糖基化被唾液酸基长链聚 LacNAc 中的内部岩藻糖基化残基阻断:生理 E-选择素表位表达的酶促基础。

DOI:
10.1006/bbrc.1998.8080
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发表时间:
1998
影响因子:
3.1
通讯作者:
Hakomori,S
Hakomori,S
中科院分区:
生物学4区
文献类型:
--
作者:
Handa,K;Withers,DA;Hakomori,S

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在我们以前的研究中,髓样细胞系HL 60中没有唾液酸基-Lexepitope的唾液酸基-岩藻糖基聚-LacNAc被证明是E-选择素依赖性粘附的配体,特别是在动态流动条件下(Handa K,Stroud MR,Hakomori S,Biochemistry 36,12412-12420,1997)。HL 60细胞仅表达岩藻糖基转移酶(FT)IV和VII。X3 NeuAcVII 3FucnLc 10是在动态流动条件下显示E-选择素依赖性结合的代表性组分,在FT-VII催化的倒数第二个GlcNAc处未发生α1 → 3岩藻糖基化,但在FT-IV催化的内部GlcNAc处发生α1 → 3岩藻糖基化。VI 3 NeuAcnLc 6通过FT-IV转化为VI 3 NeuAcIII 3FucnLc 6,但也通过FT-VII转化为VI 3 NeuAcV 3FucnLc 6。因此,FT-VII催化的倒数第二个岩藻糖基化不限于nLc 6骨架,但高度限于nLc 10骨架。FT-IV和FT-VII在合成具有唾液酸基-LEX和内部岩藻糖基化的聚-LacNAc中的协同作用可能在具有两个以上LacNAc单元的聚-LacNAc中被阻断或高度限制,因为FT-IV优先在内部GlcNAc发生α1 → 3岩藻糖基化,抑制FT-VII的倒数第二个岩藻糖基化。
Sialosyl-fucosyl poly-LacNAc without sialosyl-Lexepitope in myeloid cell line HL60 was shown to be the ligand for E-selectin-dependent adhesion, particularly under dynamic flow conditions, in our previous study (Handa K, Stroud MR, Hakomori S,Biochemistry36, 12412–12420, 1997). HL60 cells express only fucosyltransferase (FT) IV and VII. X3NeuAcVII3FucnLc10, a representative component showing E-selectin-dependent binding under dynamic flow conditions, is not α1 → 3 fucosylated at the penultimate GlcNAc catalyzed by FT-VII, but is α1 → 3 fucosylated at the internal GlcNAc catalyzed by FT-IV. VI3NeuAcnLc6is converted to VI3NeuAcIII3FucnLc6by FT-IV, but is also converted to VI3NeuAcV3FucnLc6by FT-VII. Thus, penultimate fucosylation catalyzed by FT-VII is not restricted for nLc6backbone, but is highly restricted for nLc10backbone. The cooperative effect of FT-IV and FT-VII for synthesis of poly-LacNAc having sialosyl-Lexwith internal fucosylation may be blocked or highly restricted in poly-LacNAc having more than two LacNAc units, because preferential α1 → 3 fucosylation by FT-IV takes place at internal GlcNAc, inhibiting penultimate fucosylation by FT-VII.
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