2. Cell Biology by the Numbers (free)
By Ron Milo & Rob Phillips.
A basic grasp of biophysics will help you build mental models to engineer cells. This book covers the basics: How big is a protein? How fast is transcription? How do cells power it all?
3. Molecular Biology of the Cell (you can read old versions online)
By Bruce Alberts et al.
This remains the standard molecular biology textbook. Pay special attention to Chapters 1-7. There is also some text that describes standard methods, like PCR.
7. A Computer Scientist's Guide to Cell Biology (optional)
Software engineers often email me to ask how they can get started in synthetic biology. The switch is not gentle, but this book incorporates useful mental models to help you make the transition.
Last Sunday, @AsimovPress published an article explaining why it's so hard to diagnose tuberculosis.
Here are 10 interesting things we learned about TB while editing it:
1. TB (not malaria) is the deadliest infectious disease. It kills >1.2M people each year.
2. At its "peak" in the 19th century, TB killed 1-in-4 people in Europe and America.
It killed Chopin, Thoreau, Kafka, and Eleanor Roosevelt. The disease was dubbed "the white plague," as it made victims pale.
(Edvard Munch painted his sister, who died of TB at the age of 15.)
3. TB was also, oddly, romanticized by poets at the time.
“How pale I look!” wrote the poet, Lord Byron. “I should like, I think, to die of consumption … because then the women would all say, ‘see that poor Byron — how interesting he looks in dying!’”
2. A tool called TATSI enables precise DNA insertion in plants.
It works by fusing transposase proteins with CRISPR nucleases to deliver custom DNA to specific sites in the genome. So far, it's been tested in Arabidopsis and soybean plants.
In Shanghai, I visited BluePHA, a synthetic biology startup that uses engineered microbes to manufacture biodegradable plastics.
They make ~5,000 metric tons/year, have products available on the market, and are scaling to 50,0000 tons/year. 🧵
BluePHA makes PHAs, a type of polyester made by many organisms in nature. The company can mold these PHAs into lots of different plastic products, such as cups (right) or spools of thread (left) to make bags and clothes.
Many plastics sold on the market are touted as "biodegradable," but aren't actually biodegradable.
PLAs, a common culprit, only break down at high temperatures. They will not disappear if placed in the soil in your backyard.
PHAs are fully biodegradable at normal temperatures.
Cells are fast and crowded places. Numbers help us make sense of them.
Here are five of my favorite "bionumbers."
1. ATP synthase spins 134 times/second. That is much faster than the propeller on most piston airplanes, and about half the r.p.m. of a Boeing 737 jet engine.
2. An mRNA is (much) larger than the protein it codes for.
A single nucleotide of RNA is 3x heavier than an amino acid. Three nucleotides are required to encode each amino acid; not to mention the untranslated regions, polyA tail, and so on.
(Sources are in image descriptions.)
3. A cell is 70% water by mass.
Of the remaining 30%, proteins account for more than half (55%). DNA accounts for very little; about 3% of dry mass.
But, interestingly, there are many water-dwelling, photosynthetic microbes that express GAS VESICLES. These are protein compartments, filled with gas, that help the cells float up or down in water to capture sunlight.
A visual ode:
Heinrich Klebahn, a German microbiologist, was first to discover gas vesicles amongst some cyanobacteria that he collected from a lake.
Gas vesicles come in many shapes and sizes.
Sometimes they are short, and other times they are long.
Gas vesicles are made from between 8-14 genes. These genes can be engineered to change the properties of gas vesicles.