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首页|期刊导航|海洋科学|采用SDS研究泥蚶血红蛋白(Tg-HbⅡ)具有过氧化物酶及抗菌活性的结构基础

采用SDS研究泥蚶血红蛋白(Tg-HbⅡ)具有过氧化物酶及抗菌活性的结构基础OA北大核心CSTPCD

Investigation of the structural basis for peroxidase and anti-bacterial activity of hemoglobin from blood clam Tegillarca granosa(Tg-HbⅡ)using sodium dodecyl sulfate

中文摘要英文摘要

泥蚶血红蛋白(Tg-HbⅡ)除了具有携氧功能外,还具有过氧化物酶活性和抗菌活性.本文采用分光光度法、光谱法和分子对接等技术研究了十二烷基硫酸钠(SDS)对Tg-HbⅡ的结构、过氧化物酶活性及抗菌活性的影响,以探讨Tg-HbⅡ具有过氧化物酶活性及抗菌活性的结构基础.研究结果显示,SDS的疏水烷基长链可嵌入到Tg-HbⅡ血红素口袋内部,与近端His104形成氢键,断裂血红素铁与His104的配位键,使Tg-HbⅡ的Soret带吸收峰降低并发生位移;此外,SDS还可与血红素口袋中的氨基酸形成疏水相互作用,改变血红素口袋原有结构,使得部分疏水氨基酸暴露,导致外源荧光强度增强,最大发射波长红移.SDS可以抑制Tg-HbⅡ的过氧化物酶活性,当SDS浓度为 2 mmol·L-1 时,Tg-HbⅡ的酶活性仅为原来的20%,在琼脂扩散实验中失去对枯草芽孢杆菌的抗菌活性.以上结果表明,SDS通过破坏血红素口袋的内部结构抑制 Tg-HbⅡ的过氧化物酶活性,使其失去抗菌活性,血红素疏水口袋是 Tg-HbⅡ具有过氧化物酶活性和抗菌活性的关键结构.本研究为进一步研究Tg-HbⅡ的抗菌机理奠定基础.

Hemoglobin Ⅱ from Tegillarca granosa(Tg-HbⅡ)possesses oxygen-carrying capabilities as well as peroxidase and antibacterial activities.In this study,we examined the effects of sodium dodecyl sulfate(SDS)on the structure,peroxidase activity,and antibacterial activity of Tg-HbⅡ using spectrophotometric,spectroscopic,and molecular docking techniques.Moreover,we explored the structural basis of the peroxidase activity of Tg-HbⅡand its antibacterial activities.The results revealed that the hydrophobic alkyl long chains of SDS could integrate into the heme pocket of Tg-HbⅡ,forming hydrogen bonds with the proximal His104.This interaction resulted in the breaking of the coordination bond between heme iron and His104,leading to a decrease and shift in the Soret band absorption peak of Tg-HbⅡ.Additionally,SDS could form hydrophobic interactions with the amino acids in the heme pocket,inducing alterations in the original structure and exposing some hydrophobic amino acids.This re-sulted in an enhanced exogenous fluorescence intensity and a redshift of the maximum emission wavelength.SDS demonstrated an inhibitory effect on the peroxidase activity of Tg-HbⅡ.At 2 mmol·L-1 of SDS concentration,the enzymatic activity of Tg-HbⅡ was only 20%of that of the original,and the antibacterial activity against Bacillus subtilis was lost in agar diffusion experiments.These results indicated that SDS inhibited the peroxidase activity of Tg-HbⅡ by disrupting the internal structure of the heme pocket,consequently leading to the loss of its antibacterial activity.The heme hydrophobic pocket emerged as a key structure for the peroxidase and antibacterial activities of Tg-HbⅡ.This study lays the foundation for future studies on the antibacterial mechanism of Tg-HbⅡ.

濮丽丽;王诗怡;林志华;王素芳;包永波

上海海洋大学水产与生命学院,上海 201306浙江万里学院生物与环境学院,浙江省水产种质资源高效利用技术研究重点实验室,浙江 宁波 315100浙江万里学院生物与环境学院,浙江省水产种质资源高效利用技术研究重点实验室,浙江 宁波 315100||浙江万里学院宁海海洋生物种业研究院,浙江 宁海 315604

生物工程

泥蚶血红蛋白十二烷基硫酸钠过氧化物酶活性抗菌活性血红素口袋

Tegillarca granosa hemoglobinsodium dodecyl sulfateperoxidase activityantibacterial activityheme pocket

《海洋科学》 2024 (002)

24-31 / 8

浙江省重点自然科学基金项目(LZ20C190001);浙江省科技重大专项(2021C02069-7);宁波市公益研究重点项目(2021S014);浙江省生物工程重中之重学科项目(CX2021001)和浙江省高校基本科研业务费项目[Key Natural Science Foundation of Zhejiang Province,No.LZ20C190001;Major Science and Technology Projects of Zhejiang Prov-ince,No.2021C02069-7;Ningbo Public Benefit Research Key Project,No.2021S014;Zhejiang Provincial Top Key Discipline of Biological Engi-neering,No.CX2021001,and Basic Scientific Research Operating Ex-pense Project of Zhejiang Provincial Universities]

10.11759/hykx20220924001

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