Monthly Archives: March 2019

Property based testing in Python with Hypothesis : how to break your own code before someone else does 

Traceback (most recent call last):
ZeroDivisionError: integer division or modulo by 0

We’ve all been there. You’ve written your code, tested it out on some toy data and then when you make the move to the real data, there was something you didn’t expect.

Maybe some samples have been truncated to zero. Maybe the input arrays are the wrong shape. Suddenly your code comes crashing down around you, and you’re left thinking: well how could I have known that was going to happen? I can’t test everything

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A gentle primer on quantum annealing

If you have done any computational work, you must have spent some time waiting for your program to run. As an undergraduate, I expected computational biology to be all fun and games: idyllic hours passing time while the computer works hard to deliver results… well, very different from the more typical frenetically staring at the computer, wishing the program would run faster. But there is more — there are some problems that are so intrinsically expensive that, even if you had access to all the computers on Earth, it would take more than your lifetime to solve a slightly non-trivial case of them. Some examples are full configuration interaction calculations in quantum chemistry, factorisation of prime numbers, optimal planning, and a long, long, etcetera. Continue reading →

A blog post about a blog

I thought I would make this blog post very meta by referring to another blog, written by Lior Pachter, which I think has something for many of us in it: http://liorpachter.wordpress.com (networks people, there’s a pretty scathing take-down of a quite well cited 2013 paper as one of the last posts – there seem to be a couple of posts labelled “network nonsense”!)

In particular I refer you to the list, that Lior Pachter has curated, which includes all variations of *-seq. You’ll see that practically all sequencing protocols take on this nomenclature of catchy descriptor + seq.

*Seq

You will have heard mention of Ig-seq in talks by antibody people (with all Ig-seq experiments being curated in OAS by Alex). Ig-seq comes under the “Phenotyping” section of Lior’s list.

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Not-Proteins in Parliament

Last term I took a break from folding proteins to spend three months working in Westminster at the Parliamentary Office of Science and Technology (POST).

The UK Research and Innovation (UKRI) Policy Internships Scheme gives PhD students the opportunity to spend three months in a range of policy-relevant organisations, from Government departments to the Royal Society. Applications are open to research council funded PhD students (currently including EU students). The scheme includes a three-month stipend extension, and travel/accommodation expenses are covered either by the host partner or the training grant holder.

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Journal Club: Investigating Allostery with a lot of Crystals

Keedy et al. 2018: An expanded allosteric network in PTP1B by multitemperature crystallography, fragment screening, and covalent tethering.

Allostery is defined as a conformational/activity change of an active site due to a binding event at a distant (allosteric) site.

The paper I presented in the journal club tried to decipher the underlying mechanics of allostery in PTP1B. It is a protein tyrosine phosphatase (the counter parts of kinases) and a validated drug target. Allosteric binding sites are known but so far neither active site nor allosteric site inhibitors have reached clinical use. Thus, an improved mechanistic understanding could improve drug discovery efforts.

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Some useful tools

For my blog post this week, I thought I would share, as the title suggests, a small collection of tools and packages that I found to make my work a bit easier over the last few months (mainly python based). I might add to this list as I find new tools that I think deserve a shout-out.

Biopandas

Reading in .pdb files for processing and writing your own parser (while being a good exercise to familiarize yourself with the format) is a pain and clutters your code with boilerplate.

Luckily for us, Sebastian Raschka has written a neat package called biopandas [1] which enables quick I/O of .pdb files via the pandas DataFrame class.

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