| 8 | 1/1 | 返回列表 |
| 查看: 3827 | 回復(fù): 7 | ||
[求助]
蛋白質(zhì)同源建模 已有2人參與
|
|
我在用swiss model 找模板的時候結(jié)果出來提示說分值太低(如下),請問這樣怎么辦呢? - Aligning sequence of the user template structure with the target sequence using BLAST - Alignment quality between target and specified template is too low - Aligning sequence of the user template structure with the target sequence using HHSearch - Alignment quality between target and specified template it too low - Unfortunately, we could not align the user specified template to the target - For troubleshooting, please see our article in Nature Protocols: - Bordoli, L., Kiefer, F., Arnold, K., Benkert, P., Battey, J. and Schwede, T. (2009). Protein structure homology modelling using SWISS-MODEL Workspace. Nature Protocols, 4, 1. - Workspace Pipeline parameter Cut-off parameters to model the target based on a BLAST target-template alignment Evalue : 0.0001 Minimum Template size (aa) for ranking : 25 Minimum Sequence identity : 60 Cut-off parameters to model the target based on a HHSearch target-template alignment Evalue : 0.0001 Probability : 50 MAC : 0.3 Parameters for model selection Minimal number of uncovered target residues after BLAST to run HHSEARCH : 50 Minimal number of uncovered target residues to model an additional template : 25 - Finish SMR-Pipeline in automated mode on BC2-cluster at Sat Jan 23 01:58:09 2016 |
金蟲 (小有名氣)
鐵桿木蟲 (正式寫手)
|
其實進行同源建模時候,并不是所有的蛋白全序列都可以建模,或者都能找到模板(template)。 但是對于目的蛋白,你可能只對其中某段序列區(qū)域(催化域,底物/輔酶結(jié)合域等)感興趣,而這些序列區(qū)域 可能保守度很高,可以對這些區(qū)域進行建模即可。 你可以先將全序列進行建模,如果全局比對分值很低,你根據(jù)比對結(jié)果,選取保守區(qū)域的氨基酸序列(最好含有你感興趣的區(qū)域),利用swiss model對該區(qū)域重新建模即可。 或者你試試這個建模網(wǎng)站PHYRE2:http://www.sbg.bio.ic.ac.uk/phyre2/html/page.cgi?id=index |

鐵桿木蟲 (正式寫手)

| 8 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|