Attenuation and the trp Operon — The Living Address

attenuation senses the clocktwo adjacent trp codonsribosome speed folds the RNAthree states distinguished

The biology

Attenuation regulates termination after initiation. The trp leader encodes a short peptide with two adjacent tryptophan codons. If tryptophan is abundant, the ribosome runs through them fast and the RNA folds into a terminator — transcription stops; if tryptophan is scarce, the ribosome stalls and an antiterminator forms — transcription proceeds. The cell distinguishes three states and makes trp mRNA only when it is both needed and translatable.

A molecule that reads the clock and decides

This is a molecule that senses the register-clock and acts on it: the ribosome's speed — set by how much charged tRNA the register holds — is read directly into the fold of the RNA, and the fold decides whether to go on. It is decision by timing, the same faculty a swimming cell uses (Paper 22), here inside a single transcript. The two trp codons are the sensor; the terminator and antiterminator are the two answers.

THE READING

Attenuation is the coordinate sensing its own register-clock: the rate of translation, held by the density of time, is read into a fold that chooses whether to continue.

Where this departs from current science

Current science says	The Force of Time says
Attenuation is a kinetic coupling of translation and transcription.	It is the coordinate sensing the register-clock and deciding by timing.
The three states are a signalling logic.	They are the field reading one address under three conditions of the register.

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This paper, and any information drawn from it, may be used freely provided the reference attribution to Stephen Daubney and The Daubney Foundation is recognised.