Lock and Key

Preview:

Subject: Biochemistry · Enzyme Kinetics

Short Description: The single most-tested enzyme concept on the MCAT, turned into a smooth, sensual neo-soul anthem narrated by the enzyme itself. Michaelis-Menten, Km and Vmax, and the three inhibition types — competitive, noncompetitive, uncompetitive — with the exact Km/Vmax behavior that trips up every test-taker. The chorus IS the mnemonic. You'll never confuse the three inhibitors again.

What's Included:

• 1 high-quality WAV audio file
• 1 cinematic lyric video (HD)
• Sound: Soulful Neo-Soul / R&B
• Michaelis-Menten kinetics, Km, Vmax, and the affinity relationship
• All three inhibition types with their exact Km/Vmax effects
• Lineweaver-Burk plot interpretation (the graph the MCAT loves to test)

Lyrics:

I'm the enzyme.
You're the substrate.
Come and find the place where you fit.
Lock and key, baby. Let me show you how it works.
Michaelis-Menten, that's the rhythm of the rate.
Velocity climbs as more of you arrive.
Vmax is the ceiling, the fastest I can go,
when every active site is full and occupied.
Km is the number, the substrate that you need
to get me running at half my Vmax speed.
Induced fit, baby. I mold around your frame,
but the lower the Km, the tighter I hold the game.
But sometimes there's a third one in the room.
An inhibitor, trying to slow me down.
Three different ways to break this up 
let me tell you how each one goes down.
Competitive - Km up, Vmax stays the same.
Fight for my active site, but more substrate wins the game.
Noncompetitive - Vmax down, Km doesn't move.
Uncompetitive - both come down, locked into the groove.
Competitive, noncompetitive, uncompetitive - three.
That's the way an inhibitor messes with me.
Competitive, she binds my active site.
Same spot as you, baby, fighting for the room.
But add enough substrate, you outcompete her hold 
Vmax stays the same, just Km rises up.
Noncompetitive, binds somewhere else on me.
Allosteric site, changes my whole shape.
Doesn't touch your affinity, Km stays the same,
but Vmax falls and substrate can't save the day.
And then there's the strangest one of all.
She won't touch me till you're already here.
She binds the complex enzyme plus substrate locked 
and pulls the whole equilibrium near.
Competitive - Km up, Vmax stays the same.
Fight for my active site, but more substrate wins the game.
Noncompetitive - Vmax down, Km doesn't move.
Uncompetitive - both come down, locked into the groove.
Competitive, noncompetitive, uncompetitive - three.
That's the way an inhibitor messes with me.
Flip it on a Lineweaver-Burk
the double reciprocal, where the lines reveal the truth.
Competitive lines meet directly ON the y.
Noncompetitive meet ON the x, that's the sign.
Uncompetitive? Parallel, never meet 
both come down proportional, slope stays complete.
Uncompetitive binds the ES alone,
drops Km and Vmax - pulls the binding home.
Competitive - Km up, Vmax stays the same.
Fight for my active site, but more substrate wins the game.
Noncompetitive - Vmax down, Km doesn't move.
Uncompetitive - both come down, locked into the groove.
Competitive, noncompetitive, uncompetitive - three.
That's the way an inhibitor messes with me.
I'm the enzyme.
You're the substrate.
Low Km, that's how I know I want you close.
Lock and key, baby. Lock and key.

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