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This file may be error. The precursor to ornithine and proline is thought to be glutamate-5-semialdehyde. See, for instance, Thomas M. Devlin, Textbook of Biochemistry with Clinical Correlations, Sixth Edition, p. 755 (Figure 19.28) and p. 756 (Figure 19.29).

CAS number 68462-55-5 YesY
PubChem 129297
MeSH glutamate-1-semialdehyde
Jmol-3D images Image 1
Molecular formula C5H9NO3
Molar mass 131.13 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Glutamate-1-semialdehyde is a molecule formed from glutamate, and is a precursor to ornithine and proline.

It is an intermediate in the metabolism of histidine, with the immediate precursor being formiminoglutamic acid.