A blog by two chemists working in chemistry and chemical biology
Tuesday, 29 January 2013
George Orwell's rules on writing: applicable to science?
The 65th anniversary of George Orwell’s 1984 this
year and the BBC is putting on many programs discussing the work of the great
author. Orwell had some very strong
views on how things should be written and wrote an essay on the subject about 6
rules that he thought should be at the centre of any piece of writing, so can
they be applied successfully to science writing?
Monday, 28 January 2013
Bio-orthogonal profiling of protein methylation
Protein methylation is an important biological process e.g.
histone lysine methylation is involved in both gene activation (on histone 3 and Lys 4, 36 and 79) and silencing (H3 Lys 9 or 27 and H4 Lys 20). But how can
other protein methyltransferases (PMTs) be investigated? Genetic approaches are
always useful, but can have limitations particularly if your protein isn’t very
common, forms complexes with other proteins (which would be disrupted by its
absence and cause phenotypic changes beyond protein methylation) or if your
process results in a non-viable cell. Chemical approaches would be extremely
useful and complimentary, but as always problems with selectivity have to be
overcome; a particular problem with PMTs as SAM (S-Adenosyl methionine) is a
particularly prolific enzyme co-factor.
What to do then? Islam et. al. have developed a rather elegant
solution that could allow general examination of a variety of PMTs, by creating
mutants of proteins that can accept a synthetic azido-SAM donor. The enzyme
then tags its target as before but instead of a methyl an azide containing group is left
behind, this can subsequently be reacted with tags (like biotin) which
contain strained alkynes in a bio-orthogonal manner.
Wednesday, 23 January 2013
Viva Survivor: Baldwin's rules
This is the first of the basic science posts we will be running about once a week; first up is Baldwin's rules (or guidelines as many prefer), for more detail look here.
Baldwin’s rules are empirical observations of possible
cyclisation reactions, classified according to the size of the ring being formed, the
nature of the electrophilic portion of the molecule and whether the bonds are
broken inside or outside of the ring.
Although the based on empirical observation they use stereochemical reasoning including orbital overlap and the preferred
angle of attack of a nucleophile. Because they are essentially empirical they are not really rules
in the Woodwood—Hoffman sense of the word, but should be thought of as
guidelines; there are exceptions!
Sunday, 20 January 2013
the stirrer bar
As you might be able to tell this is a new blog making it's way out into the big bad world wide web. Hopefully the title implies that this is going to be a science blog, and the fact that it's written by a couple of chemistry graduates probably gives you an idea of our area of interest.
There are many chemistry blogs out there already and seeing as neither of us works on total synthesis (which is covered very well by other blogs here and here) or the pharmaceutical industry (covered excellently here) so we are going to try to write about our major area of interest namely chemistry at the interface of chemistry and biology.
We are hoping that the blog can become a bit of a resource for people looking to learn a bit of new chemistry and so we are going to put up some named reaction posts and synthesis we like, but also posts on broader scientific areas we find interesting. Hopefully someone other than us two will find it interesting as well...
There are many chemistry blogs out there already and seeing as neither of us works on total synthesis (which is covered very well by other blogs here and here) or the pharmaceutical industry (covered excellently here) so we are going to try to write about our major area of interest namely chemistry at the interface of chemistry and biology.
We are hoping that the blog can become a bit of a resource for people looking to learn a bit of new chemistry and so we are going to put up some named reaction posts and synthesis we like, but also posts on broader scientific areas we find interesting. Hopefully someone other than us two will find it interesting as well...
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