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luckyliu881011鐵桿木蟲 (小有名氣)
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[交流]
求達(dá)人翻譯兩段話~~關(guān)于質(zhì)譜定量蛋白的文獻(xiàn)~~
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第一段: 此方法的基本策略是:在被定量蛋白質(zhì)的氨基酸序列中選擇一段相對(duì)分子質(zhì)量大小適中(一般為0.9~2 kd)、質(zhì)譜信號(hào)響應(yīng)較強(qiáng)的肽段作為模板,用化學(xué)合成或細(xì)胞培養(yǎng)的方法合成帶有一定同位素(如13C、15N、2H) 標(biāo)記的相同肽段(僅相對(duì)分子分量有差異) 作為內(nèi)標(biāo),通過(guò)檢測(cè)肽段的質(zhì)譜信號(hào)強(qiáng)度之比(峰高或峰面積比) 來(lái)對(duì)相應(yīng)蛋白質(zhì)進(jìn)行絕對(duì)定量。應(yīng)用內(nèi)標(biāo)法的前提條件是:1) 被絕對(duì)定量的蛋白質(zhì)酶切要充分;2) 被選擇作為內(nèi)標(biāo)肽段模板的肽段和蛋白質(zhì)間存在一定的定量關(guān)系。 第二段: 此方法的策略是:將待測(cè)定的蛋白質(zhì)在強(qiáng)酸條件下,進(jìn)行完全的水解,全部形成氨基酸混合物,然后加入已知量的同位素標(biāo)記的氨基酸作為內(nèi)標(biāo),經(jīng)LC-MS/MS質(zhì)譜檢測(cè)一對(duì)氨基酸的質(zhì)譜峰強(qiáng)度以實(shí)現(xiàn)對(duì)氨基酸的濃度測(cè)定,再根據(jù)此氨基酸在蛋白中的含量,計(jì)算出蛋白的量。 |
木蟲 (正式寫手)
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The basic strategy is as following: in the quantitative amino acid sequences by selecting the size of a medium molecular weight (typically 0.9 ~ 2 kd), mass spectrometry peptide strong signal response as a template, using chemical synthesis or cell culture methods synthesized with a certain isotopes (eg 13C, 15N, 2H) peptide labeled the same (only with different molecular weight) as the internal standard, detection of peptides by mass spectrometry signal intensity ratio (peak height or peak area ratio) of absolute quantification of the corresponding proteins. Application of the standard method provided that: 1) The absolute quantification of protein digestion to fully; 2) It was chosen as the internal standard template peptide between peptides and proteins there is a certain quantitative relationship. This method's strategy is: to be the determination of protein in acid conditions, full hydrolysis, all the formation of amino acid mixture, then add a known amount of isotope labeled amino acid as the internal standard by LC-MS/MS mass spectrometry one pair amino acids in order to achieve mass peak intensity of amino acid concentrations were measured, and then based on this amino acid in the protein content, calculate the amount of protein. |

鐵桿木蟲 (小有名氣)
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