
Year: 2016
More progress on huntingtin cryo-EM
I was over the moon last week to receive an update (available here) on the cryo-electron microscopy grid preparation from Dr Justin Deme, a post doc in Prof Susan Lea’s lab. Using the full-length huntingtin protein samples I prepared, Justin is preparing very small grids with the protein on them so that we can look Read More …
Updates on huntingtin EM and domain construct test expression
Last week was all about big protein samples! I got an informative email update from Prof Susan Lea and Dr Justin Deme on the full-length huntingtin EM work (all 3144 amino acids) they are doing in Oxford. The grids are definitely getting better and hopefully we will have thin enough ice to do some serious Read More …
Back in the lab! Conferences, making proteins, electron microscopy and exciting collaborations
After a month’s hiatus from my last post I am back with lots of exciting news and updates. Multiple coinciding factors mean I haven’t been able to update you all as much as I would have liked but things are back on track in the run up to the holidays so I hope to have Read More …
Screening EM conditions for full-length huntingtin Q78
Now that I have managed to purify the full-length huntingtin protein with 3 different polyQ lengths (Q23, Q46 and Q78), I can begin the more exciting experiments where I can try to understand how the protein molecule is folded and what its structure is. One method of doing this is called electron microscopy (EM). This Read More …
Large scale purification of full-length huntingtin Q23, Q46 and Q78 from insect cells
Hello lab scribbles readers! I have been busy in the lab making lots of protein for some upcoming electron microscopy experiments – all materials and methods can be found on Zenodo. These proteins are the complete full-length human huntingtin protein with either 23, 46 or 78 glutamine amino acids in the polyQ repeat stretch representing Read More …
Purifying full-length huntingtin protein from baculovirus expression system for EM analysis
Things are moving fast in the lab which is exciting as it means the project is moving forward quickly too. However, it does mean that I now have lots of data to share in this post! Firstly, thanks to very generous sharing of reagents from Dr. Ihn Sik Seong, we are now able to make Read More …
Huntingtin methylation analysis by mass spectrometry
For the past week or so I have been continuing to conduct an analysis of post-translational modifications or PTMs of the huntingtin protein. After the protein is expressed in the cell, it is often chemically modified by small moieties which can affect its fold and function called PTMs. In my last post I looked at Read More …
Huntingtin phosphorylation analysis by mass spectrometry
For the past week or so I have been conducting an analysis of post-translational modifications of the huntingtin protein. After the protein is expressed in the cell, it is then often chemically modified by small moieties which can affect its fold and function. In this instance, I have been looking at the phosphorylation of the Read More …
Follow up analysis from huntingtin test expression experiments
Previously I reported some exciting test expression data where we showed that small chunks of the huntingtin protein could be made in the lab, a key milestone to aid future experiments where we try and work out what the huntingtin protein looks like and what it might be doing in the cells of our bodies. Since Read More …
Rerun of the Test Expression of Huntingtin Domain Constructs (2016/07/06)
The last run of experiments where I have been trying to make huntingtin protein in insect cells have not been very successful. However, this has not deterred me! Looking back on the previous test expression of all of the different huntingtin fragments, there are a number of issues with the data so I decided to Read More …