I’m wondering if it is feasible to easy calculate the GRAVY score for a peptide where cysteine is modified by carbamidomethylation or thiomethylation.
I’d like to do a small survey among LC-MS practitioners here… DMSO was reported to boost sensitivity in LC-MS analyses of peptides (PMID: 23975139) but I personally know couple of people that...
01 February 2018 9,563 5 View
I need to estimated boling point for acetonitrile at different pressures. I've found a formula how to do that. The only missing information that I need is the gos constant of acetonitrile.
01 February 2018 4,528 0 View
Multiple logistic regression to estimate possible confounder effect?We revealed that a protein A has significantly higher concentration in patients than in controls, but there might be a potential...
07 August 2014 8,207 14 View
We intend to study the interaction between peptides and polymer (like PP, PE and PS) through MD simulations using Martini force fields ( Martini 2 for PP and Martini 3 for PE, PS). We have...
08 August 2024 4,842 0 View
Hi, we have measured tryptic peptides using both DDA and DIA method on QExactive. In DDA replicates i saw unusual intensity drops occurring at the same sections of chromatograms in DDA replicates...
07 August 2024 3,218 4 View
Hello, I am currently analyzing some phosphoproteomics data, but I have peptides with multiple phosphorylation sites or phosphorylations together with carbamidomethylation or oxidation. How can I...
04 August 2024 8,432 3 View
Recently I'm trying to use Sep-pack C18 1 cc Vac Cartridge (Waters: SKU: WAT054955) to desalt digested peptides. However, the recovery rate is usually 40-60%. What is the normal recovery rate?
31 July 2024 6,544 11 View
Methionine, cysteine, homocysteine, and taurine are the 4 common sulfur-containing amino acids, but only the first 2 are incorporated into proteins. Sulfur belongs to the same group in the...
22 July 2024 4,273 4 View
So i have a few peptides (synthesized by SPPS and not cleaved from resin) and I want to add a maleimide label. We have NHS-PEG-Maleimide and from literature it is evident that the free amine group...
18 July 2024 4,075 3 View
Hello everyone! I am currently working on the expression and purification of an antimicrobial peptide that experiences reduced activity after each freeze-thaw cycle. To improve its stability, I...
10 July 2024 6,830 1 View
Recently I looked up a literature《A Glucose-6-Phosphate Isomerase Peptide Induces T and BCell-Dependent Chronic Arthritis in C57BL/10 Mice Arthritis without Reactive Oxygen Species and...
09 July 2024 6,657 0 View
I am working on my PTM project. I have some peptide. I got the result of doing MD of those peptide without PTM in different force field like Charm-GUI, Amber, Gromacs. Now I have to do MD of those...
05 July 2024 9,346 0 View
I want to predict the DAR ratio based on the number of cys available for conjugation to Cys residue. I use Ellman's assay to predict the concentration of Cys after TCEP reduction. I gain a...
02 July 2024 612 6 View