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Biosynthetic Pathways in Mutations

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You have isolated four different mutants unable to synthesize compound E required
for growth. You know that compounds A through D are involved in the biosynthetic
pathway that produces compound E, but you do not know the order in which they are
synthesized by a wild-type cell. You supplement the growth of each of the 4 mutants
with each compound and assay its ability to support growth. Using the data below,
construct a biochemical pathway indicating the order of the compounds and the step
where each mutation is acting. Explain how you arrived at the map.

Compound added
1 − − − − +
2 − + + + +
3 − − + + +
4 − − + − +

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Solution Preview

First, in all mutations, E could not be synthesized. Therefore, E is the end product of the pathway.
For mutation 2, compound A is not affected, while B,C,D,E are affected. Therefore, A is in the ...

Solution Summary

Biosynthetic pathways in mutations are examined.

See Also This Related BrainMass Solution

biosynthetic pathway

The production of the purple pigment anthocyanin in flowers is accomplished via a biosynthetic pathway. A biosynthetic pathway consists of a series of enzymatic reactions resulting in the creation of a final end product via several intermediate metabolites. An example of a biosynthetic pathway is shown below:

Substrate ----(white 1)----- Intermediate A------(white 2)----- Anthocyanin

A mutation in the gene WHITE 1 or WHITE 2 will result in the inability to produce anthocyanin and thus cause the flowers to be white. Suppose that WHITE 1 and WHITE 2 are the enzymes in the biochemical pathway for the synthesis of anthocyanin (W1 = functional enzyme 1; w1 = nonfunctional enzyme 1; W2 = functional enzyme 2; w2 = nonfunctional enzyme 2).

(a) Which molecule (substrate, intermediate A, or anthocyanin) is accumulated in a plant that has the genotype "w1w1"? What will be the color of the flowers?
(b) What molecule is accumulated in a plant that has the genotype "w2w2"? Whatwill be the color of the flowers?
(c) What molecule is accumulated in a plant with the genotype "W1w1;w2w2"? What is the color of the flowers
(d) If a W1W1w2w2 plant were crossed with a plant that is w1w1W2W2, what would be the genotype of the progeny? What will be the color of the flowers?

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