Question: How To Find Similarity Between The 3D Protein Structures?
2
gravatar for Pol
8.5 years ago by
Pol30
Pol30 wrote:

Hi folks,

I have 5 modeled protein structures from I-TASSER and one modeled protein structure using modeler. Now how can i find which structure of ITasser is similar to the modeled protein structure (found using modeler) ?

And also how can i find which gives the more accurate result (ITASSER or Modeler) ?

proteomics protein • 3.7k views
ADD COMMENTlink modified 8.5 years ago by Reyhaneh480 • written 8.5 years ago by Pol30
2
gravatar for Zhizhong
8.5 years ago by
Zhizhong270
Zhengzhou
Zhizhong270 wrote:

Maybe pymol can help you, it can be used to ovelap different proteins. You can first load your modeled protein, then ovrelap the 5 modeled protein structures with it one by one. studying the RMSD will give some infromation about the similarity. ALso, you can ovrelap the 5 structures mutually. this can give you a clue about the differences among the five ones. Since I don't know by what principle you will determine the accuracy of the reuslts, I have no idea to answer your second question.

ADD COMMENTlink written 8.5 years ago by Zhizhong270

Thanku @zhizhong

ADD REPLYlink written 8.5 years ago by Pol30
2
gravatar for Jan Kosinski
8.5 years ago by
Jan Kosinski1.6k
Jan Kosinski1.6k wrote:

how can i find which structure of ITasser is similar to the modeled protein structure

Compare every I-TASSER model with Modeller model using TM-score or LGA.

how can i find which gives the more accurate result (ITASSER or Modeler)

Without a native structure (a "true" structure of protein you're modeling) you can only do so called Model Quality Assessment (MQAP), which gives you estimates of global and sometimes local quality of the model. There are many MQA programs (MQAPs), one of the best, if not the best is QMEAN

ADD COMMENTlink written 8.5 years ago by Jan Kosinski1.6k
2
gravatar for Bilouweb
8.4 years ago by
Bilouweb1.1k
Saclay, France
Bilouweb1.1k wrote:

I like to use TopMatch to compare Protein 3D structures quickly. But I also use Dali and MAMMOTH.

ADD COMMENTlink written 8.4 years ago by Bilouweb1.1k
1
gravatar for Rm
8.4 years ago by
Rm7.9k
Danville, PA
Rm7.9k wrote:

SuperPose : Maiti et al 2004

The ProCKSI-Server

SSAP: Taylor & Orengo, 1989

STRUCTAL: Subbiah, Laurents & Levitt, 1993 Gerstein & Levitt 1998

DALI: Holm & Sander, 1993 ; Holm & Park, 2000

DEJAVU /LSQMAN Kleywegt: 1996

CE: Shindyalov & Bourne, 1998

SSM: Krissinel & Henrick, 2003

http://www.cgl.ucsf.edu/home/meng/grpmt/structalign.html

ADD COMMENTlink written 8.4 years ago by Rm7.9k
0
gravatar for dimkal
8.4 years ago by
dimkal730
United States
dimkal730 wrote:

there's a whole page dedicated to different structure alignment software/methods on wikipedia. One of my favorite is called "MAMMOTH" Check out: http://en.wikipedia.org/wiki/Structural_alignment_software

ADD COMMENTlink written 8.4 years ago by dimkal730
0
gravatar for Reyhaneh
8.3 years ago by
Reyhaneh480
United Kingdom
Reyhaneh480 wrote:

open all 6 structure in Pymol. then use the "Fit" command between every structure of ITASSER and MODELER structure:

fit (selection), (target-selection)

Not only you can see their similarity visually but also it gives you an RMSD which lower RMSD between two structures shows more similarity at the structure level.

some really good serves also exist which do Multiple Structure Alignment at the same time: Multiprot MATRAS

for the second question if you have the Wild type existing then you can also use fit to see the difference between the 6 models and the wild type. again lower RMSD can show better results. but you need to see the bondings as well where important residues are involved. fit ( mutant and name ca ), ( wildtype and name ca )

ADD COMMENTlink written 8.3 years ago by Reyhaneh480
Please log in to add an answer.

Help
Access

Use of this site constitutes acceptance of our User Agreement and Privacy Policy.
Powered by Biostar version 2.3.0
Traffic: 2235 users visited in the last hour