ocam62磷酸肽的钙结合机制
及抑制磷酸钙结晶的效果
黄海1,2,李八方3,曾名湧
3,*
(1.钦州学院食品工程学院,广西钦州535011;
2.广西北部湾特色海产品资源开发与高值化利用高校重点实验室,广西钦州535011;
张永琪
3.中国海洋大学食品科学与工程学院,山东青岛266003)
收稿日期:2016-04-08作者简介:黄海(1977-),男,博士,副教授,研究方向:水产品加工及资源利用,
E-mail : 。*通讯作者:曾名湧(1965-),男,博士,教授,研究方向:水产品高值化利用,
E-mail :mingyz@ouc.edu 。基金项目:国家自然科学基金(31101379);国家星火计划项目(2012GA740048)。
摘
tting要:探讨源于鲤鱼卵肽(carp egg peptide ,
CEP )的磷酸肽(isolated phosphopeptide ,IPP )的钙结合机制及其抑制磷酸钙结晶的效果。通过质谱和红外光谱解析IPP 结合钙的位点,通过红外光谱和圆二色谱分析IPP 结合钙前后的空间结构变化,我有一个梦想马丁路德金
并通过电镜观察IPP 抑制磷酸钙结晶的效果。结果表明,磷酸基团是钙离子的优先结合部位,1分子IPP 能结合4个钙离子,
羧酸基团未参与钙离子的结合。IPP 在生理pH 下无论是否结合钙离子均未形成有序的空间二级结构,完全以无序状态存在。在磷酸钙过饱和溶液中,IPP 能够与磷酸根离子竞争与钙离子的结合,并吸附到晶核表面,ecuador>brush怎么读
抑制其聚集成结晶。IPP 是通过磷酸基团与钙结合,并能有效抑制磷酸钙结晶。
关键词:鲤鱼卵肽,磷酸肽,钙结合,结晶抑制Mechanism of binding Ca 2+and the effect of
西安英语家教
inhibiting calcium phosphate crystal formation of phosphopeptide
HANG Hai 1,2,LI Ba -fang 3,ZENG Ming -yong 3,
*(1.College of Food Engineering ,Qinzhou University ,Qinzhou 535011,China ;
2.Guangxi Colleges and Universities Key Laboratory of Development and High-value Utilization of
Beibu Gulf Seafood Resource ,Qinzhou 535011,China ;
3.College of Food Science and Engineering ,Ocean University of China ,Qingdao 266003,China )
Abstract :To investigate the mechanism of binding Ca 2+and the effect of inhibiting calcium phosphate crystals formation of isolated phosphopeptide (IPP )derived from carp egg peptide (CEP ).The Ca 2+binding sites of IPP were determined by mass spectrometry (MS )and Fourier transform infrared spectroscopy (FTIR).The change of its space structure after binding Ca 2+was studied through FTIRand circular dichroism spectroscopy (CD ).The effect of IPP inhibiting calcium phosphate crystal formation was obrved by electron microscope .The results showed that phosphate had the priority to binding Ca 2+.One mole of IPP could bind four moles of C
a 2+and carboxyl group could not bind calcium .Regardless of the prence of Ca 2+,IPP was prent in the state of unorded structure in solution under physiological conditions ,without any ordered condary structures .In the supersaturated solution of hydroxylapatite (HAP ),IPP could compete with phosphate to bind Ca 2+and adsorb to the surfaces of crystal nucleus ,which inhibited the nuleation of calcium phosphate and its aggregation to crystal .Key words :carp egg peptide ;phosphopeptide ;binding Ca 2+;crystal inhibition
中图分类号:TS254.1文献标识码:A
文章编号:1002-0306(2016)19-0062-06
ma是什么意思沈阳早教机构doi :10.13386/j.issn1002-0306.2016.19.004钙的吸收主要是在小肠进行,在小肠吸收的钙
约占总吸收钙的90%[1]。然而由于小肠的弱碱环境
以及食物中存在的磷酸、tongji university
植酸、草酸会使钙形成难溶性盐,导致钙的吸收利用率低下。目前,国内外科研
工作者通过酶解、
分离方法已从各种食物蛋白质中制备了一些具有结合钙离子和抑制生成磷酸钙沉淀活性的肽,如Jiang 等从蛋黄中得到与钙离子结合能力较强的蛋白肽,其肽链中富含Ser 、Thr 和Asp 残基[2]。Jung 等从鳕鱼纯化出促进Ca 2+吸收的活性肽,
其肽链中的Ser 、Thr 、Met 和Tyr 残基有阻止小肠