g*********r 发帖数: 9366 | 1 ?
I remember that both 5 and 6 histag is working fine with Ni resin |
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M********r 发帖数: 278 | 2 Really like what histag recommends. But keep in mind that this is a long
term portfolio for retirement. Very likely what will happen is that some of
the components will underperform badly and some will out perform for a
period of time. Don't dump the loser and chase the winner. Simply rebalance
the portfolio to its original allocation. I believe vanguard has the option
to do this automatically for you. Don't time the market. and that's a really
difficult thing to do for some people. |
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h****g 发帖数: 259 | 3 【 以下文字转载自 EB23 讨论区 】
发信人: histag (stone), 信区: EB23
标 题: 有I-193入境的吗?
发信站: BBS 未名空间站 (Sat May 30 10:08:53 2015, 美东)
I-485上怎么填入境和签证信息?Status按I-94填,visa部分填N/A?求解 |
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y******0 发帖数: 8807 | 4 Transfer $10.0 to vilta... @ level 2.....successful
Transfer $10.0 to sundoctor... @ level 3.....successful
Transfer $10.0 to itworker... @ level 4.....successful
Transfer $10.0 to Summer12... @ level 5.....successful
Transfer $10.0 to duel... @ level 6.....successful
Transfer $10.0 to bbdou... @ level 7.....successful
Transfer $10.0 to mjmj001... @ level 8.....successful
Transfer $10.0 to histag... @ level 9.....successful
Transfer $10.0 t... 阅读全帖 |
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j******g 发帖数: 1428 | 5 我觉得2类本财年到13年还是挺乐观的。
目前为止,相比于上财年,才绿了53.23%,(305/573)。
根据histag发的数据,下个月排期不动,估计板上报绿就是20个左右。
这样就算下个月末,本财年比上财年,都没绿到60%。 |
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m****m 发帖数: 395 | 6 提纯蛋白后老发现14KD附近有条杂带,是不是lysozyme啊?我的蛋白有HISTAG的,难道lysozyme没被洗掉吗?按理lysozyme不应该结合Ni柱啊,难道lysozyme粘住我要的蛋白
了?大家说说有没有这种情况?
而我要的蛋白又恰恰在15KD上面一点,结果这两条带离得很近,很奇怪 |
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c*****t 发帖数: 198 | 7 我最近一直在表达一个膜蛋白在壁膜间隙的那段。DNA sequence也是对的, 但是不知
为什么跑SDS胶时总是发现多出3kD。 我是用的Histag过的柱。 |
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g*****y 发帖数: 6325 | 8 很多都可以。 histag, tev 什么的都可以自己加。 又不难。 |
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S*******e 发帖数: 17 | 9 本来要加6个的,设计primer时没仔细数,结果测序出来只有5个 |
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s******y 发帖数: 28562 | 10 如果只是做标记信号可以,因为有些抗体其实就是针对5xHis 设计的,
如果想用来pulldown 那应该不行 |
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s******y 发帖数: 28562 | 11 啊?这个我还得不知道。5个也行么? 特异性怎么样? |
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t**s 发帖数: 284 | 12 It's binding to the Ni resin will be weaker. In fact, many histidine
residues in proteins can bind to Ni/Mn etc, just that their binding are much
weaker. |
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s********n 发帖数: 2939 | 13 Re this.
应该能够bind到resin上,可能结合力下降一些(Imidazole洗脱的浓度低)。有时候不
一定是坏事,可能会提高分辨率。
much |
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m*p 发帖数: 226 | 15 Positive and negative charge interaction may be weakened, but still will be
fine.
You are lucky, as you missed three nucleotides, but not two or one. |
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y***i 发帖数: 11639 | 20 hehehe。。。。我同意啊。
做错实验没问题,但这种事情还心存侥幸想能不能做下去,除非是老板钱不够想省钱
。不然只能说懒到不知轻重的地步,继续做生物,估计没什么希望。 |
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h**********r 发帖数: 671 | 21 应该没啥问题吧,看看sigma家的MAT-tag, HNHRHKH.人家隔一个才是His,照样行。MAT-
Tag (Metal Affinity Tag) |
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s********n 发帖数: 2939 | 23 不至于吧。
如果不赶时间的话可以试试,其实His tag也有多种versions,只是6xHis常用而已。但
如果赶时间可以重新克隆,同时验证这个5xHis tag是否work。
不是很明白为什么要加his tag在primer上呢?没有带His tag的vector? |
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s******s 发帖数: 13035 | 24 应该可以吧。GST还是比较容易纯化的,不想histag |
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g*********r 发帖数: 9366 | 25 有的地方有相当好的resource
有的地方有cloning facility, high throughput crsytallogrphy screening
facility
你拿来coding sequence,你说要放到什么vector 里面,histag, GST tag, mbp tag
同时尝试, 要什么mutant/truncation , 几种选择,一个礼拜交活,你拿走plasmid,
然后你拿去fermentation facility长
回去自己纯化, 然后robot setup box, robot inspection,
没有这些的结构小组,是无论如何不会有竞争力的 |
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X*******0 发帖数: 134 | 26 做了,是带Tag的.你说的这些Tag,能解决问题吗?补充一下:我已经试了往蛋白C端和
HisTag之间塞了从4个一直到16个氨基酸长度的Tail或者说linker,还是不挂柱,我怀疑
我C端包在蛋白构象内部包得很深.你说的2种也是基于Tag的,会不会也有这样的Tag被包
的问题?能不能有不依靠Tag的,比如分子筛什么的有可行性吗? |
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s*******e 发帖数: 1010 | 27 Hisx10肯定不是灵丹妙药,我做的时候大概只有一半相对于Hisx6产率有所提高。螯合
金属当然不会有太多的His参与,但也有个His的局部浓度的问题。一个明显的例子就是
我有几个即使连着Hisx10的蛋白,咪唑梯度洗脱的时候也是先洗脱单体,再提高浓度才
洗脱二聚体。如果10和20个His有差别,我认为6和10有差别是必然的。
因为还没见过有副作用的例子,所以只好一律X10了。你说的影响溶解度的情况我还没
遇到过——His-tag影响溶解度是肯定的,但是没遇到过长短Histag影响的差别明显的
情况。
至于影响结晶,从来不敢带着Tag去长晶体,无论x6还是x10,一律切掉再说。 |
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r******t 发帖数: 629 | 28 我用agilent的Site-Directed Mutagenesis Kit在蛋白的N端加6 his tag。
分两步加的,一次加三个,结果第一次三个加得很容易,第二次的三个就是加不上,
primer也是靠agilent自己网上的primer design做的。
不知道有啥办法吗?
目前好郁闷啊。
另外,有没有人试过用3个his的tag来纯化呢? |
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r******t 发帖数: 629 | 32 哦呵呵,谢谢指导。
我觉得这个round the horn也挺有意思的。
嗯,这个网站也很有趣。 |
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b******y 发帖数: 627 | 33 3 His is not close to be enough for purification. At least 6 His. If you can
, 8 or 10.
5' long primer containing: overhang sequence (e.g. GGAA); cloning site (make
sure in frame); His6 ---5' of your gene, should be the way to go as
abovementioned. |
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m******5 发帖数: 1383 | 34 怎么可能6his加不上?引物应该有问题,我1xflag2xha8glycine 都是一次性在引物上
加的 |
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b******y 发帖数: 627 | 35 He/she is doing mutagenesis. |
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s******y 发帖数: 28562 | 36 3个不可以,最短必须要四个。
另外,如果你非要用site directed mutagenesis 的话,最好不要用完全一样的
his codon. |
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s******9 发帖数: 283 | 37 我问过NEB的人,如果要用histag,他们得付专利费。 |
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发帖数: 1 | 39 先看看带着hisTag的Ago能否正确将C-端正位。 |
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