Mysteries of the Electron Transport Chain, Revealed in Rap!

SUMMARY: This video teaches about electron transport chain.The electron transport chain (ETC) is the final stage of cellular respiration, where electrons are transferred through a series of protein complexes in the inner mitochondrial membrane. This process generates a proton gradient that drives the synthesis of ATP, the cell’s main energy currency, through chemiosmosis.

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LYRICS

Welcome to this story about cell energy
The goal is explaining how cells make ATP
It happens in the mitochondria which you can think of
As the cell’s energy factory

Mitochondria are double-membraned organelles,
An inner membrane and an outer one as well
The mitochondrial matrix is the fluid inside
It’s where reactions like Krebs cycle reside

Glycolysis and Krebs make NADH
and FADH2 from energy in food
These electron carriers make their way
From the matrix to the inner membrane.

And that’s where you find the electron transport chain
It’s a series of enzymes embedded in the membrane,
Which take the electron carrier’s electrons
And uses their energy for pumping protons

CHORUS
The mitochondrial electron transport chain
Uses electron energy for pumping protons
From the mitochondrial matrix to the intermembrane space
Increasing proton concentration in that place,
The only way the protons can escape
Is through a channel and an enzyme, ATP synthase.
Which uses diffusing protons’ kinetic energy
To make ATP, from ADP and P

The chain is a series of enzymes in a row
Each accepts electrons, then lets them go
To the next carrier in this transport chain.
It’s kind of organized like a bucket brigade

What drives electrons down this enzymatic series
Is the growing level of each carrier’s electronegativity
And to oxygen electrons ultimately fall
It’s the most electronegative of them all

It’s NADH that starts this run
Donating electrons to Complex number I
This powers active transport as protons are displaced.
And get pumped from the matrix to the intermembrane space

From Complex I electrons flow to
Ubiquinone, also known as “Q”
Which floats through the inner membrane happily
And brings its electrons to Complex III

And you can guess the function of Complex III .
It’s another proton pump using electron energy
Protons jam up in that intermembrane compartment
Like a hundred people in a one bedroom apartment!

CHORUS

Complex II is for FADH2
Which donates electrons, which then get passed to Q
Which once again passes them to Complex III
Which pumps protons using electron energy

From Complex III the electrons proceed
To another mobile carrier, Cytochrome C
Which donates the electrons to Complex IV
Another proton pump, could you ask for more?

After Complex IV electrons flow,
To oxygen which is ever so
Electronegative it pulls electrons down the chain,
Keeping them moving like the cars of a train.

And as O2 does this electron grabbing trick,
It also grabs protons from the matrix.
They all combine to form H2O
Electron transport chain, watch it go!

CHORUS

Now all these protons in the intermembrane space
Are trapped they can’t get out of that place
‘Cause protons are charged and could never get through
A phospholipid bilayer, they can’t diffuse

There’s only one channel that let’s the protons pass,
And they use it like high school students busting out of class,
It’s a channel and an enzyme, it’s ATP synthase
The closer in this game, an energy ace

ATP synthase is embedded in the inner membrane
How it works is so cool it’s insane.
It’s got channels for diffusing protons running right through it.
When cells make ATP, well watch how they do it

The matrix side of ATP synthase has binding sites
For ADP and P which come in and bind.
And as ATP synthase lets protons barge through
Their kinetic energy gets put to use.

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