欢迎关注公众号:oddxix
1.SMART入门,蛋白结构和功能分析
SMART (a Simple Modular Architecture Research Tool) allows the identification and annotation of genetically mobile domains and the analysis of domain architectures. More than 500 domain families found in signalling, extracellular and chromatin-associated proteins are detectable. These domains are extensively annotated with respect to phyletic distributions, functional class, tertiary structures atant residues. Each domain found in a non-redundant protein database as well as search parameters and taxonomic information are stored in a relational database system. User interfaces to this database allow searches for proteins containing specific combinations of domains in defined taxa. For all the details, please refer to the publications on SMART.
SMART(http://smart.embl-heidelberg.de/),可以说是蛋白结构预测和功能分析的工具集合。简单点说,就是集合了一些工具,可以预测蛋白的一些二级结构。如跨膜区(Transmembrane segments),复合螺旋区(coiled coil regions),信号肽(Signal peptides),蛋白结构域(PFAM domains)等。
使用SMART前该知道的
- 1.SMART有两种不同的模式:normal 或genomic
主要是用的数据库不一样。Normal SMART, 用的数据库 Swiss-Prot, SP-TrEMBL 和 stable Ensembl proteomes。Genomic SMART, 用全基因组序列。详细列表:http://smart.embl-heidelberg.de/smart/list_genomes.pl
- 2.一些名词解释
http://smart.embl-heidelberg.de/help/smart_glossary.shtml
SMART进行时
可以直接用各个数据库蛋白的ID。如Uniprot/Ensembl ID / accession number (ACC)。或是直接蛋白序列。运行SMART也可选择signal peptides、PFAM domains等的预测,勾上就是。看下图
SMART结果
运行后的结果用图表表示。其实运行后的结果都有明确的解释。详细请看下面。
不同结构的预测由不同的工具完成。如果你想了解更多,可访问去该工具的网站。
-
跨膜区(Transmembrane segments), TMHMM2 program 。表示方式:
TRANS
TRANS
-
复合螺旋区(coiled coil regions),Coils2 program。表示方式:
COIL
COIL
-
信号肽(Signal peptides),SignalP program。表示方式:
SIGNAL
SIGNAL
-
蛋白结构域(PFAM),PFAM。
不止这几个的。其它不一一列举。因为都是详细的说明。点击图标链接,就能看到该区域的序列,或是一些详细的描述。如上图的跨膜区,点击进去就是该跨膜区从开始到结束的序列
另外,不一定所有预测的区域都会用在图示里看到。一般SMART的显示顺序是SMART > PFAM > PROSPERO repeats > Signal peptide > Transmembrane > Coiled coil > Unstructured regions > Low complexity。另外其它不用图解显示的区域,在底下的表格也有详细说明。
2.Sanger的Pfam数据库
The Pfam database is a large collection of protein families, each represented by multiple sequence alignments and hidden Markov models (HMMs).
3.NCBI的CDD(Conserved Domain Database)数据库
网址:http://www.ncbi.nlm.nih.gov/Structure/cdd/wrpsb.cgi
Proteins often contain several modules or domains, each with a distinct evolutionary origin and function. NCBI’s Conserved Domain Database is a collection of multiple sequence alignments for ancient domains and full-length proteins.
点击阅读原文可转至原文
欢迎关注oddxix
有趣的灵魂等着你~
如果觉得写的不错记得点个赞哦~
网友评论