New Approach for Local Structure Analysis of the Tyrosine Domain in Proteins by Using a Site-Specific and Polarity-Sensitive Fluorescent Probe | |
Chen, Suming; Li, Xiaohua; Ma, Huimin | |
刊名 | CHEMBIOCHEM |
2009-05-04 | |
卷号 | 10期号:7页码:1200-1207 |
关键词 | Analytical Methods Fluorescent Probes Local Polarity Detection Transition Metals Tyrosine |
ISSN号 | 1439-4227 |
DOI | 10.1002/cbic.200900003 |
英文摘要 | The design and synthesis of a novel long-wavelength polarity-sensitive fluorescence probe, 6-[9-(diethylamino)-5-oxo-5H-benzo[alpha]phenoxazin-2-yloxy]hex-2-enyl acetate, for the selective modification of tyrosine residues with the goal of providing local information on tyrosine domains in proteins, is reported. This probe comprises a polarity-sensitive Nile red fluorophore and an active pi-allyl group that can form pi-allyipalladium complexes and react selectively with tyrosine residues. The probe has the following features: 1) it has a long-wavelength emission of > 550nm, thanks to which interference from short-wavelength fluorescence from common biological matrixes can be avoided; 2) the maximum emission wavelength is sensitive only to polarity and not to pH or temperature; this allows the accurate determination of local polarity; and 3) it is a neutral, uncharged molecule, and does not disturb,the over-all charge of the labelled protein. With this probe the polarity and conformation changes of the Tyr108 domain in native and in acid- and heat-denatured bovine Cu/Zn superoxide dismutase were detected for the first time. It was found that the polarity of the Tyr108 domain hardly alters on acid denaturation between pH 4 and 9. However, heat denaturation caused the Tyr108 domain to be more hydrophobic, and was accompanied by an irreversible aggregation of the protein. In addition, the probe-binding experiments revealed that the surface of the protein becomes more hydrophobic after thermal denaturation; this can be ascribed to the formation of the more hydrophobic aggregates. This strategy might provide a general approach for studying the local environment changes of tyrosine domains in proteins under acid or heat denaturation conditions. |
语种 | 英语 |
出版者 | WILEY-V C H VERLAG GMBH |
WOS记录号 | WOS:000266382900011 |
内容类型 | 期刊论文 |
源URL | [http://ir.iccas.ac.cn/handle/121111/67513] |
专题 | 中国科学院化学研究所 |
通讯作者 | Ma, Huimin |
作者单位 | Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China |
推荐引用方式 GB/T 7714 | Chen, Suming,Li, Xiaohua,Ma, Huimin. New Approach for Local Structure Analysis of the Tyrosine Domain in Proteins by Using a Site-Specific and Polarity-Sensitive Fluorescent Probe[J]. CHEMBIOCHEM,2009,10(7):1200-1207. |
APA | Chen, Suming,Li, Xiaohua,&Ma, Huimin.(2009).New Approach for Local Structure Analysis of the Tyrosine Domain in Proteins by Using a Site-Specific and Polarity-Sensitive Fluorescent Probe.CHEMBIOCHEM,10(7),1200-1207. |
MLA | Chen, Suming,et al."New Approach for Local Structure Analysis of the Tyrosine Domain in Proteins by Using a Site-Specific and Polarity-Sensitive Fluorescent Probe".CHEMBIOCHEM 10.7(2009):1200-1207. |
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