Yearly Archive

Yearly Archives: 2022

November 22, 2022 no comments

A quiet revolution in the world of proteomics

Proteomics – examining the panoply of proteins within a complex sample – has been around much longer than the word we use today to describe it.  Proteomics the word was coined in around 1997 as a portmanteau coupling the now-ubiquitous “omics” suffix to the word protein.  But two decades earlier two-dimensional gel electrophoresis was the cutting-edge technology that first visualised the “complete” catalogue of proteins in a sample, such as a cell lysate or blood sample.

Even the earliest 2D-gels revealed the complexity of the proteome, with beautiful trails of spots across the isoelectric point axis delineating proteins with multiple charged post-translational modifications such as phosphorylations.  But almost half a century later, technology has struggled to deliver a reproducible and accurate picture of this complexity.  Most proteomics methodology used today provides an enumeration of the major proteins present with poorly validated attempts at quantitation and even less focus on the subtly different variants of each “protein” present in the mixture.

Unsurprisingly in a world dominated by the molecular biology of DNA, the concept of protein has come to mean the product of translating a single mRNA from a single gene – ignoring the complexity that arises both from errors and from post-translational modifications that are both deliberate and regulated (such as phosphorylation) and those that simply damage the polypeptides (such as most oxidations).  All these close-variants get consolidated in a single concept: in most people’s mind, a protein such as apoE is a homogeneous population of perfectly translated copies of the encoding gene; in reality it is a morass of subtly different chemical entities – so many in fact that hardly any two molecules of “apoE” are actually identical.

This chemical diversity within the population of molecules derived from a single gene has been termed “quantum resolution” proteomics, by analogy to the finer resolution of the quantum domain compared to “classical” physics.  That it exists is interesting, but the real question is whether it matters?  If this “quantum zoo” of subtly different variants is really nothing but noise (and all the variants have identical function), then the answer would clearly be a resounding ‘no’.  But data is accumulating to suggest it matters a lot: resolving one variant from another – and understanding what drives their relative concentrations – may be just as important in biology as regulation of gene expression.

Some examples are already obvious: proteolytic cleavage is a well-known post-translational modification, not least because it creates a big change in the …

July 19, 2022 no comments

How to find a drug: the past, present and future of small molecule drug discovery

Despite the current hype around so called “advanced …

February 7, 2022 no comments

Re-Imagining Med Chem Strategies: the Tyranny of the n+1 Compound

Finding small molecule drugs is much harder than …

May 24, 2021 no comments

Why Small Beats Big: the Hidden Cost of Too Many Voices

The coronavirus pandemic has taught us a lot …

February 16, 2021 no comments

The history – and the future – of antibody discovery technologies

Monoclonal antibodies are now well-established as a mainstay …

January 8, 2021 no comments

Why Sarepta’s most recent failure in DMD was entirely predictable

Yesterday, Sarpeta (NASDAQ: $SRPT) announced that its gene …

January 2, 2021 no comments

One dose or two? What the debate about COVID vaccination teaches us about science – and its limitations

Over the past week a furious debate has …

November 9, 2020 no comments

The Hidden Superpower of Strategic Focus

The first death unequivocally caused by COVID was reported to …

April 14, 2020 no comments

COVID19: Serology is harder than it looks

More than a month after the World Health …

January 24, 2018 no comments

The Cult Of DNA-centricity

  Understanding the role of DNA in biology is …


Yearly Archive