Over the past few weeks of SURF, I have been working to purify a protein. Sounds dull? It may be pretty repetitive and tedious but it’s certainly far from boring.
Before I could purify my protein I first had to grow the E.Coli cells. A tons of them. Actually 10 liters of culture. Like I explained before, we first have to grow the E.Coli cells into which we inserted the protein before we can extract it. The first step, therefore, was to use this giant machine called a fermentor to grow the cells in a relatively short period of time. And sadly no I can’t make yogurt in it…..
Here it is! 10 liters of broth full of antibiotic resistant E.Coli cells. All this for only 100 milligrams of protein. Pretty ridiculous right?
Throughout the day, I had to monitor the air flow, pH, and other parameters to make sure the E.Coli grew up properly. As you may expect, E.Coli being a bacteria has a rather musty, not exactly pleasant smell, and let me tell you, 10 liters of E.Coli definitely smelled up the whole lab. I felt bad for all my other lab mates who had to suffer through it with me.
After I made the culture, I had to centrifuge the liquid to isolate only the cells. These centrifuges are special heavy-duty ones that can spin at speeds over 50,000 times g-force. Let me put that in context for you: Most roller coasters can reach accelerations of about 4-6 times g-force. I would feel sorry for the cells but…..
Afterward, came the purification process. Since the protein I am purifying is considered a LCST–lower critical solution temperature–protein (that is, it dissolves at 4°C but aggregates at 37°C) we alternate hot and cold cycles to purify the protein.
First, we centrifuge at 4°C to get rid of the cell membrane and other parts of the cell that we don’t need. Then we incubate the liquid in the incubator above and then centrifuge again at 37°C to get rid of more unneeded parts in the cell. Repeat two more times and the protein is purified. Though it sounds like a pretty short process, it actually took me a whole week and a half to complete due to overnight steps, three hour long centrifuging processes, etc.
Finally, after the last centrifuging process, we then dialysize the proteins to get rid of any other salts that may be in the liquid which we re-suspended the protein in.
Here are all my bottles from the centrifuging process. I feel bad for hording all of them, but my mentor wants to keep them just in case something goes wrong since it is a two week long process.
After a hard day of work, what’ s better than spending time with friends? My favorite part about the SURF program is that it’s easy to get together with friends since we’re all staying on campus. And since most students at Caltech do decide to participate in the SURF program over the summer, there’s always plenty of people to spend time with.
Another nice thing about the SURF program is that there is plenty of good, cheap food around the Caltech area. Perfect for the poor, starving and lazy student :)
This summer I had the incredible opportunity to do a 10-week internship at Gilead Sciences in Foster City, CA. For those unfamiliar, Gilead Sciences, Inc. is a research-based biopharmaceutical company focused on the discovery, development, and commercialization of innovative medicines.
With 45 Nobel Laureates on its Faculty Roster, it’s not surprising that research is an integral part of the Caltech undergraduate experience. One of the programs that promotes such research is the Summer Undergraduate Research Fellowship (SURF). There is no minimum knowledge or experience required to participate in a Caltech SURF. In fact, students can participate in a SURF as soon as the summer after their freshman year. It is not difficult to get a SURF. All you need to do is find a mentor who is working in an area of research that interests you and willing to mentor you through a research project. The mentor can work in a Caltech lab, at the NASA Jet Propulsion Laboratory (JPL), or at another participating institution. Once you find a mentor, you work together to write a project proposal that you later send to the SURF office for review and approval. About 98% of the SURF proposals get approved. This fellowship is a great way to explore various fields of research and obtain real, hands-on experience where you get to apply the theoretical knowledge you’ve learned in class. Not only do you get to work and learn alongside your mentor, but you also get compensated for your time. The length of the SURF is ten weeks, and it starts at the beginning of the summer. However, it is not uncommon for many students at Caltech to continue their research project throughout the academic school year.
Like many students at Caltech, I suffer from a slight boba addiction, where side effects may include over caffeination, minor sugar highs, and of course, a large toll on one’s wallet. This addiction is not helped by the fact that there are at least three boba shops within walking distance of campus. So, after an entire term’s worth of boba runs, I came back from winter break with a new year’s epiphany: it was time to get a job. Rather than try to curb my addiction, I decided to find a way to subsidize it.
Research at Caltech looks different for every student, and can often vary term by term. As a chemistry major, my course requirements are on the lighter side for a Caltech major, and many chemistry majors take advantage of the lighter course load to join research groups. This can be whenever the student wants, but many people join labs during their freshman or sophomore years. Some may work in one lab only, and some may switch between labs during the course of their undergraduate studies, depending on if their interests change.