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褐藻寡糖(alginate oligosaccharides,AOS)是褐藻胶的降解产物,具有抗氧化、调节免疫、调节血脂、促进细胞生长等生理活性,应用范围广泛.现有的AOS制备法主要分为物理法、化学法和生物法.介绍AOS的生物法制备包括酶解、微生物全细胞发酵和生物合成法,基因工程的应用在改造产褐藻胶裂解酶的菌株以提高生... 相似文献
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褐藻寡糖(alginate oligosaccharides,AOS)是褐藻胶的降解产物,具有抗氧化、调节免疫、调节血脂、促进细胞生长等生理活性,应用范围广泛。现有的AOS 制备法主要分为物理法、化学法和生物法。介绍AOS的生物法制备包括酶解、微生物全细胞发酵和生物合成法,基因工程的应用在改造产褐藻胶裂解酶的菌株以提高生物法效率方面具有重要意义。此外,规模化的AOS生物法制备案例进行了科学引证,并展望了未来 AOS规模化制备的发展方向,以期为 AOS 的工业化制备和应用提供参考。 相似文献
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海带多糖生物活性的研究进展 总被引:11,自引:0,他引:11
海带中富含功能性物质,其中海带多糖主要包括褐藻胶、褐藻糖胶、褐藻淀粉三种,其分离提取工艺还不是太成熟,海带多糖结构迥异、性质不同,具有复杂的多方面的生物活性,在调节免疫、抗肿瘤、抗凝血、降血脂、降血糖、抗辐射、抗突变、抗体内氧化和耐缺氧等方面具有独特的功能。 相似文献
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褐藻胶寡糖生物活性研究进展 总被引:1,自引:0,他引:1
褐藻寡糖AOS由β-D-甘露糖醛酸(ManA)和α-L-古洛糖醛酸(GulA)通过1-4糖苷键连接而成,具有广泛的生物活性,如促进植物生长、缓解植物非生物胁迫、抗肿瘤、抑菌等作用,在绿色农业、医药保健等领域具有广阔的前景。本文综述了近几年来褐藻胶寡糖在生物活性方面的研究进展,并对其应用前景进行了展望。 相似文献
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褐藻作为第三代生物乙醇生产原料,以其高碳水化合物含量、生产周期短、不与粮争地的优势逐渐被人们所关注。但是在生物乙醇的实际生产中,低成本基础上乙醇产率的提高一直是亟需解决的问题。主要针对褐藻制备生物乙醇的技术困难,综述了适用于大规模生产生物乙醇的预处理技术和糖化发酵技术的研究进展,并由此展望褐藻制备生物乙醇的研究发展新方向。 相似文献
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【目的】筛选一株能降解褐藻胶的菌株,并优化产酶条件以提高褐藻胶裂解酶活力。【方法】从漳州海域采集到海水和海泥,以海藻酸钠为唯一碳源,通过富集培养、初筛、复筛筛选到一株能够降解褐藻胶的菌株。依据16S rRNA序列分析、生理生化特征、菌体形态及菌落特征对该菌进行鉴定。通过单因素和正交试验对该菌的产酶条件进行优化。【结果】该菌属于海科贝特氏菌,命名为Cobetiamarina HQZ08。该菌株最佳的产酶培养基组成为:海藻酸钠7.00g/L、蛋白胨3.00g/L、NaCl30.00g/L,K2HPO4·3H2O 1.25 g/L。最佳发酵条件为:接种量2%,接种龄12 h,培养基起始pH为7.0,培养温度25°C,培养时间24 h。优化后褐藻胶裂解酶活力达到68.5 U/mL,TLC法分析酶解产物为褐藻胶寡糖。【结论】HQZ08菌株可以用于降解褐藻胶,产生聚合度为2–6的褐藻胶寡糖。 相似文献
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Akihito Ochiai Masayuki Yamasaki Bunzo Mikami Wataru Hashimoto Kousaku Murata 《Acta Crystallographica. Section F, Structural Biology Communications》2006,62(5):486-488
Almost all alginate lyases depolymerize alginate in an endolytical fashion via a β‐elimination reaction. The alginate lyase Atu3025 from Agrobacterium tumefaciens strain C58, consisting of 776 amino‐acid residues, is a novel exotype alginate lyase classified into polysaccharide lyase family 15. The enzyme was crystallized at 293 K by sitting‐drop vapour diffusion with polyethylene glycol 4000 as a precipitant. Preliminary X‐ray analysis showed that the Atu3025 crystal belonged to space group P21 and diffracted to 2.8 Å resolution, with unit‐cell parameters a = 107.7, b = 108.3, c = 149.5 Å, β = 91.5°. 相似文献
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Cloning and Sequence Analysis of Vibrio halioticoli Genes Encoding Three Types of Polyguluronate Lyase 总被引:1,自引:0,他引:1
The alginate lyase-coding genes of Vibrio halioticoli IAM 14596T, which was isolated from the gut of the abalone Haliotis discus hannai, were cloned using plasmid vector pUC 18, and expressed in Escherichia coli. Three alginate lyase-positive clones, pVHB, pVHC, and pVHE, were obtained, and all clones expressed the enzyme activity specific
for polyguluronate. Three genes, alyVG1, alyVG2, and alyVG3, encoding polyguluronate lyase were sequenced: alyVG1 from pVHB was composed of a 1056-bp open reading frame (ORF) encoding 352 amino acid residues; alyVG2 gene from pVHC was composed of a 993-bp ORF encoding 331 amino acid residues; and alyVG3 gene from pVHE was composed of a 705-bp ORF encoding 235 amino acid residues. Comparison of nucleotide and deduced amino
acid sequences among AlyVG1, AlyVG2, and AlyVG3 revealed low homologies. The identity value between AlyVG1 and AlyVG2 was
18.7%, and that between AlyVG2 and AlyVG3 was 17.0%. A higher identity value (26.0%) was observed between AlyVG1 and AlyVG3.
Sequence comparison among known polyguluronate lyases including AlyVG1, AlyVG2, and AlyVG3 also did not reveal an identical
region in these sequences. However, AlyVG1 showed the highest identity value (36.2%) and the highest similarity (73.3%) to
AlyA from Klebsiella pneumoniae. A consensus region comprising nine amino acid (YFKAGXYXQ) in the carboxy-terminal region previously reported by Mallisard
and colleagues was observed only in AlyVG1 and AlyVG2.
Received May 7, 1999; accepted September 4, 1999. 相似文献
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海藻酸分解菌研究进展 总被引:1,自引:0,他引:1
海藻酸分解菌是一类能够自身合成海藻酸裂解酶,能够降解并同化海藻酸的微生物。海藻酸分解菌是海藻酸裂解酶的重要来源,其产生的海藻酸裂解酶具有种类多、反应条件温和、酶活高和易于大规模生产等优点,并且在生物、医疗、化工等领域有重要的应用价值。在过去的几十年里,海藻酸分解菌一直作为海藻酸裂解酶生产者的角色被研究和应用。但随着近年来能源危机的加剧,以海藻酸等海藻生物质为原料转化生物能源成为解决能源危机的潜在途径,因此,海藻酸分解菌又有了崭新的研究领域,即海藻酸分解菌利用海藻酸发酵生产生物能源。本文从海藻酸分解菌及其海藻酸裂解酶的种类和特性、海藻酸分解菌的代谢以及海藻酸分解菌基因工程等方面,介绍海藻酸分解菌的研究现状,并展望未来的发展趋势。 相似文献
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海洋弧菌褐藻胶裂解酶的分离纯化及性质 总被引:3,自引:0,他引:3
从海带糜烂物中分离到一株高产胞外褐藻胶裂解酶的海洋弧菌 (Vibriosp .QY10 1) ,利用硫酸铵沉淀、离子交换层析、凝胶过滤层析等方法从发酵液中分离纯化了褐藻胶裂解酶 (alginatelyase)。SDS PAGE电泳结果表明 ,该酶分子量为 39kD。酶反应最适pH为 7.5 ,最适反应温度为 30℃。Na 、Ca2 、Mn2 对酶活性有促进作用 ,Fe2 、Ni2 以及EDTA对酶活性有抑制作用。酶的底物专一性初步分析结果表明 ,该酶具有降解多聚古罗糖醛酸[poly(G) ]及多聚甘露糖醛酸 [poly(M) ]的活性。 相似文献
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《Bioscience, biotechnology, and biochemistry》2013,77(9):1532-1534
The objective of this study was to prepare two series of authentic oligo-guluronic acids from sodium alginate. Oligo-guluronic acids (DP = 1–9) were prepared from an acid hydrolysate of poly-guluronic acid by successive chromatographies of Bio-Gel P-6 and Q Sepharose Fast Flow. Oligo-guluronic acids having 4-deoxy-l-erythro-hex-4-enopyranosyluronic acid residues at the non-reducing end (DP = 2–7) were prepared from the enzymatic degradation products of the poly-guluronic acid in the same manner. Each of the isolated oligo-guluronic acids gave a single band on fluorophore-assisted carbohydrate electrophoresis. These results suggest that successive chromatographies used in this study are well suited for the preparation of alginate-derived oligouronic acids. 相似文献
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《Bioscience, biotechnology, and biochemistry》2013,77(11):1853-1857
Pseudomonas sp. OS-ALG-9 produces several kinds of alginate-degrading enzymes both intra- and extracellularly. As a second alginate lyase of this bacterium, the gene encoding alyII has been cloned in Escherichia coli JM109 by shotgun techniques and then sequenced. The alyII gene has an open reading frame of 2141 bp encoding 713 amino acid residues with a calculated molecular mass of 79,803 Da. The deduced amino acid sequence did not show any extensive similarity with those of other known alginate lyases, however, hydrophobic cluster analysis showed that alyII belonged to class 3 of alginate lyases. The alginate lyase from E. coli harboring the alyII gene showed a single active band, which coincided with one of four major alginate lyases from the crude cell extracts of Pseudomonas sp. OS-ALG-9 on a zymogram. 相似文献
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Wang YH Yu GL Wang XM Lv ZH Zhao X Wu ZH Ji WS 《Acta biochimica et biophysica Sinica》2006,38(9):633-638
Extracellular alginate lyase secreted by marine Vibrio sp.YWA,isolated from decayedLaminaria japonica,was purified by a combination of ammonium sulfate precipitation and diethylaminoethyl-Sephacel column chromatography.The results show that the molecular mass of alginate lyase wasapproximately 62.5 kDa,with an optimal pH and temperature at pH 7.0 and 25℃,respectively.K_m wasapproximately 72.73 g/L.The activity of the enzyme was enhanced by EDTA and Zn~(2 ),but inhibited by Ba~(2 ).The substrates specificity analysis shows that it was specific for hydrolyzing poly-β-D-1,4-mannuronate inalginate. 相似文献