My Old Enzymes

(To the tune of “Auld Lang Syne”) / Recording by David Simmons

Whene’er my proteins go kaput
If they are past their prime.
The cells will act to soon replace
All of my old enzymes

They know which ones to break apart
Ubiquitin’s the sign
A marker for pro-TE-a-somes
To find the old enzymes

These soon get bound and then cut up
In pieces less than nine
More chopping yields the single ones
Building blocks from old enzymes

So in a way the cell knows well
Of father time it’s true
Amino acids when reused
Turn the old enzymes to new

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