Biosynthesis of Aromatic Compounds: 13C NMR Spectroscopy of Whole Escherichia Coli Cells

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1982 Oct 1

PMID 6136965

Citations 28

Authors

T Ogino

C Garner

J L Markley

K M Herrmann

Affiliations

Soon will be listed here.

Abstract

13C and 31P NMR spectra of wild-type Escherichia coli showed resonances from metabolic intermediates of glycolysis and ATP formation but no detectable signals from aromatic amino acids. However, tyrosine biosynthesis from D-[l-13C]glucose was observed in cells harboring a feedback-resistant allele of aroF, the gene encoding tyrosine-sensitive 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase [7-phospho-2-keto-3-deoxy-D-arabino-heptonate D-erythrose-4-phosphate-lyase (pyruvate-phosphorylating), EC4.1.2.15], one of the isoenzymes that control carbon flow through the common aromatic biosynthetic pathway. A similar accumulation of tyrosine and phenylalanine is seen in cells carrying a multiple-copy plasmid that carries a wild-type aroF allele in addition to pheA and tyrA, the structural genes for controlling enzymes of the terminal pathways to phenylalanine and tyrosine biosynthesis. These in vivo measurements by a noninvasive probe suggest feedback inhibition as the quantitatively major mechanism controlling carbon flow in the common aromatic compound biosynthetic pathway. In strains accumulating aromatic amino acids, a transient accumulation of trehalose was detected, indicating that previously unknown changes in Escherichia coli metabolism accompany overproduction of aromatic compounds.

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