Re: [問題] 有人有跑過bovin beta casein的SDS-PAG …
※ 引述《whitee (被振奮,也需要被刺痛。)》之銘言:
: 如題,bovine的beta caseine購自sigma
: 理論分子量應該是25 kDa(precursor)/23 kDa(processed)
: 不過拿去run SDS-PAGE卻是在31 kDa上面一點點的位置
: 請問有人知道是什麼原因嗎?
: 謝謝~
自問自答
查了一下paper, 有一篇paper是寫說:
The molecular weight of bovine beta casein (A2) calculated from amino
acid sequence is 23573 Da, but it migrates at ~30 kDa on SDS-PAGE.
It has been proposed that the abnormal migration of beta casein is
due to the uneven distribution of negtive charge along the
polypeptide chain and execssive binding of SDS to beta casein
(3.4 g of SDS/g), compare to the other proteins(1.4 g/g of protein).
※ 編輯: whitee 來自: 140.112.129.8 (04/16 18:28)
※ 編輯: whitee 來自: 140.112.129.8 (04/16 18:36)
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