N-acetyllactosamine | 73793-07-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: N-acetyllactosamine
• 英文别名: methyl-8-{[beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl]oxy}nonanoate；methyl 9-[(2R,3R,4R,5S,6R)-3-acetamido-4-hydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxynonanoate
• CAS: 73793-07-4
• 化学式: C₂₄H₄₃NO₁₃
• 分子量: 553.604
• InChiKey: GHFINFLCQVDPOQ-CYABAIRNSA-N

物化性质

• 沸点：
  803.6±65.0 °C(Predicted)
• 密度：
  1.36±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  -1.7
• 重原子数：
  38
• 可旋转键数：
  16
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.92
• 拓扑面积：
  214
• 氢给体数：
  7
• 氢受体数：
  13

反应信息

• 作为反应物：
  描述：

  N-acetyllactosamine 在 sodium periodate 作用下， 以 水 为溶剂， 反应 2.0h， 生成 9-{(2R,3R,4R,5S,6R)-3-Acetylamino-5-[(R)-1-((R)-1-formyl-2-hydroxy-ethoxy)-2-oxo-ethoxy]-4-hydroxy-6-hydroxymethyl-tetrahydro-pyran-2-yloxy}-nonanoic acid methyl ester
  参考文献：
  名称：

  Novel Hybrid Morpholino-Glycopeptides with the Amino Acid Nitrogen Replacing C-3 of the Pyranose Ring

  摘要：

  高碘酸氧化吡喃糖苷可产生二醛，二醛可在氨基酸存在下进行还原性胺化，生成杂化糖肽，其中氨基酸氮插入生成的 2,4-二脱氧吡喃糖苷的第 3 位。我们制备了九种这样的 3-吗啉衍生物，包括一种 N-乙酰半乳糖胺的二糖类似物（δ²-Gal(1→4)δGlcNAc），其中甘氨酸的氮被插入半乳糖环中。由此产生的杂交二糖是一种温和的岩藻糖基转移酶的极佳底物，这种酶可将其转化为一种新型的功能化 LeX 模拟物。

  DOI：

  10.1055/s-1997-800
• 作为产物：
  描述：

  2,3,4,6-tetra-O-tetramethylsilyl-α-D-galactopyranosyl iodide 在 β-galactosyltransferase 、 alkaline phosphatase 作用下， 以 二氯甲烷 为溶剂， 反应 23.0h， 生成 N-acetyllactosamine
  参考文献：
  名称：

  Rapid Conversion of Unprotected Galactose Analogs to their Udp-Derivatives For Use in the Chemo-Enzymatic Synthesis of Unnatural Oligosaccharides

  摘要：

  The rapid conversion of D-galactose, its 2-deoxy, 3-deoxy, 4-deoxy and 6-deoxy derivatives and L-arabinose to their UDP-derivatives (2-7) is described. The procedure involves the in situ preparation of the per-O-trimethylsilylated glycopyranosyl iodides and their direct reaction with UDP. All six sugar nucleotides were active as substrates for beta(1-->4)-galactosyltransferase and were used to enzymatically prepare N-acetyllactosamine (8) and five of its analogs (9-13).

  DOI：

  10.1080/07328309808001892

文献信息

• Characterization of a novel Salmonella Typhimurium chitinase which hydrolyzes chitin, chitooligosaccharides and an N-acetyllactosamine conjugate
  作者：Tanja Larsen、Bent O Petersen、Birgit G Storgaard、Jens Ø Duus、Monica M Palcic、Jørgen J Leisner

  DOI：10.1093/glycob/cwq174

  日期：2011.4

  assigned to glycoside hydrolase family 18 encoded by the SL0018 (chiA) gene in Salmonella enterica Typhimurium SL1344. A C-terminal truncated form of chiA lacking a putative chitin-binding domain was amplified by PCR, cloned and expressed in Escherichia coli BL21 (DE3) with an N-terminal (His)6 tag. The purified enzyme hydrolyzes 4-nitrophenyl N,N′-diacetyl-β-d-chitobioside, 4-nitrophenyl β-d-N,N′,N″-triacetylchitotriose

  沙门氏菌含有注释为几丁质酶的基因。然而，它们的几丁质分解活性从未得到证实。现在，我们证明了针对分配给鼠伤寒沙门氏菌SL1344中SL0018（chiA）基因编码的糖苷水解酶家族18的几丁质酶的这种活性。通过PCR扩增缺乏假定的几丁质结合域的chiA的C末端截短形式，克隆并在具有N末端（His）6标签的大肠杆菌BL21（DE3）中表达。纯化的酶水解4-硝基苯基N，N'-二乙酰基-β- d-壳聚糖，4-硝基苯基β- d - N，Ñ '，Ñ “-triacetylchitotriose和羧甲基甲壳素雷玛唑亮紫但不作用4-硝基苯基ñ -乙酰基β- d -glucosaminide，肽聚糖或4-硝基苯基β- d -cellobioside。酶活性的特征还在于使用1 H核磁共振直接监测产物的形成，这表明几丁质是释放N，N'-二乙酰基壳二糖的底物。水解在保留构型的情况下发生，并且该酶仅作用于壳寡糖底物的
• Glycosyltransferases: An Efficient Tool for the Enzymatic Synthesis of Oligosaccharides and Derivatives as well as Mimetics Thereof
  作者：Said Rabbani、Oliver Schwardt、Beat Ernst

  DOI：10.2533/000942906777675047

  日期：——

  Research over the past two decades has uncovered numerous biological roles for carbohydrates, e.g. in cell adhesion processes, signal transduction, malignant transformation, or viral and bacterial cell-surface recognition. Carbohydrates and structural analogues thereof are therefore considered as potential new leads. Although the chemical synthesis of carbohydrates is well established, the preparation of particular oligosaccharides still remains a costly and cumbersome challenge. A complementary approach to the chemical synthesis is the use of enzymatic methods. The transfer of monosaccharide moieties to natural substrates, catalyzed by glycosyltransferases, exhibits excellent chemo-, regio- and stereoselectivity. In addition, enzymatic glycosylations permit the synthesis of carbohydrate derivatives and even carbohydrate mimetics. Our results reveal a remarkable synthetic potential of fucosyltransferases VI (EC 2.4.1.65) and III (EC 2.4.1.65), and ? (2?3)-sialyltransferase ST3Gal III (EC 2.4.99.6). Their use for the preparative synthesis of oligosaccharides and derivatives as well as mimetics thereof is demonstrated.

  过去20年的研究揭示了碳水化合物在许多生物学过程中的作用，例如在细胞黏附过程、信号转导、恶性转化或病毒和细菌细胞表面识别中的作用。因此，碳水化合物及其结构类似物被认为是潜在的新线索。虽然碳水化合物的化学合成已经得到了很好的建立，但特定寡糖的制备仍然是一项昂贵而繁琐的挑战。化学合成的补充方法是使用酶法。由糖基转移酶催化的单糖基团转移到天然底物上，具有出色的化学、区域和立体选择性。此外，酶促糖基化允许合成碳水化合物衍生物甚至类似物。我们的研究结果显示，岩藻糖转移酶VI（EC 2.4.1.65）和III（EC 2.4.1.65），以及（2-3）-唾液酸转移酶ST3Gal III（EC 2.4.99.6）具有显著的合成潜力。我们演示了它们在制备寡糖及其衍生物和类似物方面的应用。
• Acceptor hydroxyl group mapping for calf thymus α-(1 → 3) - galactosyltransferase and enzymatic synthesis of α-d-Galp-(1 → 3)-β-d-Gal p-(1 → 4)-βd-GlcpNAc analogs
  作者：Keiko Sujino、Carles Malet、Ole Hindsgaul、Monica M. Palcic

  DOI：10.1016/s0008-6215(97)00268-1

  日期：1997.12

  Abstract The epitope of the acceptor substrate for α -(1 → 3)-galactosyltransferase from calf thymus has been mapped by using a series of mono-deoxygenated and mono- O -alkylated Type II (β- d - Gal p-(1 → 4)-β- d - Glc p NAc ) disaccharides. The 4-OH group of the β- d -galactopyranosyl residue is a key polar group essential for glycosyl transfer, tolerating neither deoxygenation nor O -alkylation

  摘要：利用一系列单脱氧和单-O-烷基化的II型（β-d-Galp-（1→ 4）-β-d-Glcp NAc）二糖。β-d-吡喃半乳糖基残基的4-OH基是糖基转移所必需的关键极性基团，既不耐受脱氧也不耐受O-烷基化。易于容许在6和6'位被各种极性烷基取代基取代，从而允许制备酶促合成一系列在每个羟基上带有极性取代基的三糖衍生物。这些新的类似物是艰难梭菌毒素A和人抗α-Gal抗体的潜在抑制剂。
• Acceptor Specificity of Different Length Constructs of Human Recombinant α1,3/4-Fucosyltransferases
  作者：Theodora de Vries、Cheryl A. Srnka、Monica M. Palcic、Stuart J. Swiedler、Dirk H. van den Eijnden、Bruce A. Macher

  DOI：10.1074/jbc.270.15.8712

  日期：1995.4

  activity toward glycoproteins, whereas chimeric Fuc-TIII and Fuc-TV had a decreased activity with glycosphingolipids, compared to the full-length enzymes. Unexpectedly, chimeric Fuc-TV exhibited a GDP-fucose hydrolyzing activity. In substrates with multiple acceptor sites, the preferred site of fucosylation was identified. Fuc-TIII and Fuc-TV catalyzed fucose transfer exclusively to OH-3 of glucose in

  在COS-7细胞中表达的重组全长，与膜结合的岩藻糖基转移酶的受体特异性以及α1,3-岩藻糖基转移酶（Fuc-T）III，Fuc-TIV和Fuc-的可溶性蛋白A嵌合形式电视被分析为各种寡糖，糖脂和糖蛋白底物。我们对全长酶的研究结果证实并扩展了先前的研究。然而，与全长酶相比，嵌合Fuc-Ts对糖蛋白的活性增加，而嵌合Fuc-TIII和Fuc-TV对糖鞘脂的活性却降低。出乎意料的是，嵌合的Fuc-TV表现出GDP-岩藻糖的水解活性。在具有多个受体位点的底物中，鉴定了岩藻糖基化的优选位点。1 H NMR光谱证实，Fuc-TIII和Fuc-TV分别催化将岩藻糖仅转移至乳糖N-新四糖和乳糖N-四糖中葡萄糖的OH-3上。薄层色谱免疫染色显示，FucT-IV首选nLc6Cer中的远端GlcNAc残基，而Fuc-TV则首选近端G1-cNAc残基。将Fuc-TIV或Fuc-TV与VI3NeuAcnLc6Cer
• Synthesis and photolytic activation of 6″-O-2-nitrobenzyl uridine-5′-diphosphogalactose: a ‘caged’ UDP-Gal derivative
  作者：Karin Mannerstedt、Ole Hindsgaul

  DOI：10.1016/j.carres.2008.01.021

  日期：2008.4

  Placing an 2-nitrobenzyl group on O-6 of the galactosyl residue in uridine-5'-diphosphogalactose (UDP-Gal) gives 6 ''-O-2-nitrobenzyl-UDP-Gal that is shown to be inactive as a donor substrate for beta-(1 -> 4)-galactosyltransferase (GalT). On irradiation at 365 nm, the nitrobenzyl group is completely removed yielding native UDP-Gal that then transfers normally to produce the expected beta Gal-(1 -> 4)-beta GlcNAc disaccharidic linkage. 6 ''-O-2-Nitrobenzyl-UDP-Gal thus fulfils the minimum requirements of a 'caged' UDP-Gal for application in time-resolved crystallographic studies of beta-(1 -> 4)-GalT. (C) 2008 Elsevier Ltd. All rights reserved.