Cooking up Crowded Curries

For now I’ll continue with the food analogies to talk about one other source of uncertainty in biophysical and biomaterials measurements.  That is the property of Molecular Crowding.  When we think of a chemical reaction or forming materials our first thought is to considering it occurring in a vacuum, with infinite space around it.  In nature, and especially inside of cells, this is not always the case.  We need to take into account how much freedom the molecules in these places have to rotate and move.  This might force them to undergo some molecular yoga!

Curry

Consider this curry I made for one lab potluck.  In addition to the curry base itself it’s crowded full of spices and vegetables.  If I were to cook the curry with just potatoes, for instance, each potato piece could cook and absorb the spices surrounding it.  If I add some frozen veggies, however, the veggies near the potatoes would melt and dilute the curry around the potatoes with water. This would lead to a very slight change in flavor.  To take our analogy to a cell, the cell’s cytoplasm can be like a veggie crowded curry.  There are many many proteins floating around and some of them are changing the local concentration of molecules (like water!) in given parts of the cell.  This can affect, say, the rate of enzymatic reaction by pushing molecules closer together so that the enzymes can grab more molecules.  This is just another thing to consider when we’re thinking about how reactions inside of a vacuum can be very different than reactions in real life!

GRW

PS: I’m currently reading a very interesting paper about the origins of life and how molecules were forced to bend, twist, and react in weird ways to make up our modern system of biochemistry.  I’ll post about it next time!

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2 thoughts on “Cooking up Crowded Curries

  1. Maggie says:

    Dr. Wiedman,

    I really like your posts and I’m a PhD student entering the biophysics/structural biology field myself. A really interesting paper although kind of outside of my field is:

    Protein Stabilization by Macromolecular Crowding through Enthalpy Rather Than Entropy
    Michael Senske, Lisa Törk, Benjamin Born, Martina Havenith, Christian Herrmann, and Simon Ebbinghaus*

    Would you ever consider including these food recipes in your posts?

    Thanks!

    Maggie

    Like

  2. Thanks for the interesting paper! Recipes would be a good idea! Here is the one for the curry I made:

    Materials:

    Cilantro
    Garlic
    Turmeric
    Chili Pepper
    Ginger

    Potatoes
    Onions
    Frozen Veggies
    Coconut milk
    Vegetable oil

    Methods:

    1. Combine the top 5 ingredients in food processor (it is best to use fresh ingredients)

    2. Add approximately 1 tsp of vegetable oil to a pot and heat at >100 C

    3. Add potatoes and cook for 5-10 min

    4. Add onions and cook for 5-10 min (or until clear)

    5. Add 2 cans of coconut milk to a sauce pan

    6. Add the 5-ingredient mix from above to the coconut milk

    7. Heat on medium for 10 minutes

    8. Add the frozen veggies and potatoes/onions and cook until the curry reaches desired consistancy

    9. Enjoy

    Results:

    (see above)

    Like

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