The New Serine Protease Song

(to the tune of “Rudolph the Red-Nosed Reindeer”)

Copyright © 2011 Kevin Ahern

David Simmons' recording HERE


All serine proteases

Work almost identically

Using amino acid

Triads catalytically


First they bind peptide substrates

Holding onto them so tight

Changing their structure when they

Get them in the S1 site


Then there are electron shifts

At the active site

Serine gives up its proton

As the RE-ac-tion goes on


Next the alkoxide ion

Being so electron rich

Grabs peptide’s carbonyl group

Breaks its bond without a hitch


So one piece is bound to it

The other gets set free

Water has to act next to

Let the final fragment loose


Then it’s back where it started

Waiting for a peptide chain

That it can bind itself to

Go and start all o’er again


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