1
vote
1answer
99 views

Codon alignment via Python? [closed]

I have pairs of coding DNA sequences which I wish to perform pairwise codon alignments via Python, I have "half completed" the process. So far.. I retrive pairs of orthologous DNA sequences from ...
3
votes
0answers
86 views

Statistical Coupling Analysis (SCA) to identify coevolved residues: use of ICA

We've begun to try out the SCA Matlab toolbox (latest version) downloaded from Dr. Rama Ranganathan's website, and, following the included tutorials, would like to apply it to our protein family. The ...
1
vote
1answer
107 views

What are the differences between HPRD and BIOGRID databases?

What are the differences between HPRD and BIOGRID protein-protein interactions databases? What are their purposes? Why do we need two different databases? How is data collected into each one? How ...
-1
votes
1answer
57 views

Is there any definition of complexity about gene and protein according their function?

Sorry for such a question,if it is too naive. Is there any definition of complexity about gene and protein according their function?If so,what is the relation between them?
1
vote
0answers
38 views

Which mass spectrometry database search algorithms include the fragment mass accuracy in the calculation of protein scores?

E.g. in a MASCOT search, the accuracy of the fragment ions in a ms/ms spectrum does not have any influence on the scores of identified proteins (unless the fragment ions are out of the set ms/ms ...
3
votes
1answer
91 views

Superposing DNA

I have a series of protein models with DNA docked. I now want to superpose the DNA on a reference DNA molecule and extract the translational distance applied and the rotation angle used. I can ...
1
vote
1answer
65 views

What are the characteristics of a promising drug target?

When researchers are looking to start developing a drug, what characteristics do they look for in the potential proteins (assuming they already have good quality structural models)?
0
votes
1answer
55 views

SNPs mapping into protein

Starting a new project on protein-protein interactions and SNP analysis tool development. I would like to ask how does SNPs is mapped into protein? What does mapping means?
2
votes
3answers
94 views

What biochemical molecule viewer allows for changes in amino acids and resulting tertiary structure?

I am familiar with the Jmol, Rasmol and PyMoL softwares, and was recently introduced to BioBlender. However, I am completely unaware if any of these programs (or others) are capable of loading a .pdb ...
3
votes
2answers
112 views

High sequence similarity but start codon isn't methionine

I have noticed in a particular genome sequence of a prokaryote that various regions in a sequence share similarity which is high(>80%) with known proteins. However, the start is not a methionine. Is ...
4
votes
1answer
80 views

Determining if a Protein Model Contains a Backbone Clash

I have an ensemble of homology models of a protein, and I now wish to remove those models which have backbone clashes. I could obviously check by eye but this is subjective and probably will not be ...
7
votes
2answers
234 views

How to compute properties of peptides ?

I have been tasked with writing a program for computing properties of a give set of peptides. These peptides are given as 1-letter amino acid sequences and I need to compute the following : Length ...
9
votes
2answers
121 views

What role does a protein's size have on protein-protein interactions?

Protein-protein interactions are when two or more proteins bind together, possibly for some important biological function. Recently, I'm starting to look more into proteins, and in particular, ...
3
votes
2answers
223 views

JMol “calculate HBONDS”: which atom is the donor/acceptor?

JMol can be used to identify Hydrogen bonds in proteins by the script "calculate HBONDS". By outputting the state of the network, we can obtain a lisdt of H-bonds. Here's one line from an example ...
9
votes
1answer
134 views

Protein data bank syntax: Can two protein secondary structures “overlap”?

I have a technical question regarding the syntax in Protein Data Bank files. In the protein with PDB# 1AE9 (pdb file), there are two lines in the .pdb file: ...
6
votes
1answer
273 views

How can I predict DNA binding affinities from a protein sequence?

Are there any computational tools to predict the binding affinity to specific DNA motifs from protein domain sequence information?
12
votes
1answer
5k views

What is the significance and method behind Ramachandran plots?

My PI showed a Ramachandran plot in class today with minimal explanation, but I'm interested in finding out more. I understand that the Ramachandran plot shows the relation between the omega phi and ...
7
votes
1answer
117 views

PDB Mining: Why Do I Find Atoms Less than 1 Angstrom Apart?

I am attempting to find potential Hydrogen bonds between Hydrogen donors and aromatic ring acceptors. I do this by predicting the location of Hydrogens on residues and then calculating how far these ...