How to setup pbc in only z-direction in gromacs ?

Please help for setting up a dimeric peptide infinite only in z-direction with constant distance between periodic images in GROMACS. Thanks Lata

03 April 2018 5,190 4 View

How to generate infinite system in gromacs usibng pbc ?

I want to generate an infinite peptide fibril as has been mentioned in attached publication. I am using gromacs but dont know which options to be used with -pbc option in .mdp file. please help

02 March 2018 4,423 0 View

Analyse peptide-water interaction from gromacs trajectory

Kindly suggest how to analyse H-bond between peptide and surrounding water molecules from a gromacs trajectory file.

04 May 2017 768 2 View

How to define parameters for solvent Trifluoroethanol for SCRF run using Gaussian ?

I want to perform calculation in solvent 2,2,2-Trifluoroethanol in gaussian but its not defined in gaussian. Please help me out how should I proceed for the same.

01 February 2017 5,540 5 View

Population analysis (Boltzmann distribution) from MD simulation ?

Dear All, please let me know how to perform population analysis (Boltzmann distribution) from MD simulation (in terms of energy). I have Phi/ Psi dihedral values from MD simulations (Gromacs), I...

31 December 2016 210 4 View

Why does blocking with my immunogenic peptide cause nuclear fluorescence in ICC?

Hi all, I am validating a polyclonal antibody raised against human ANT4, through WB and ICC. In most of my controls, the antibody shows very little off-target binding, but when I pre-incubate the...

03 March 2021 5,999 3 View

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View

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23 February 2021 4,014 3 View

How to reduce static electricity of powder after lyophilization?

I am working on synthesizing and then purifying peptides using the SPPS system. After purification of the peptide, the peptide powder is obtained using a freeze dryer. When measuring the powder,...

22 February 2021 10,099 5 View

Can we remove the fmoc group after peptide cleavage?

I have synthesized the peptide using Fmoc based solid phase peptide synthesis. Also I have cleaved the peptide from the resin and lyophilized it, but later realized that, I forgot to deprotect the...

21 February 2021 4,537 3 View

How T cells recognise non-peptide antigens?

This might sound very basic question, but please share with me an explanation of how the T cell is activated when the antigen is not a peptide? What happens? And what are the molecules involved in...

21 February 2021 564 3 View

Help with Amyloid beta detection protocol (western-blotting)?

Hi everyone, I am a first year PhD student working on amyloidosis. I would like some tips and tricks to crack efficiently my current nightmare, i.e. the western blotting of the Amyloid beta and...

11 February 2021 2,513 3 View

Buillding 3D Model Fussion Protein with Modeller?

Hello May i ask you about using Modeller for making 3D model fussion protein. I want to build a fusion/chimera protein structure which is including 2 different protein and then evaluate quality...

09 February 2021 9,369 2 View

How to assing secondary structure to calculated peptide/protein having xyz file?

Hi, I have an optimized structure of some peptides and I would like to represent it as a secondary structure - cartoon. Ok, so server apps ask for pdb file (like Stride). I tried in different...

04 February 2021 517 3 View

Identical spectra for L- and D-peptides after they self-assemble?

Hi dear all, I need advice. I have two peptides with the same sequence but one consists of L-amino acids only and the other consists of D-amino acids only. when they self-assemble in aqueous...

03 February 2021 2,032 3 View