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. 1982 Mar;149(3):1021–1026. doi: 10.1128/jb.149.3.1021-1026.1982

Effects of iron deficiency on heme biosynthesis in Rhizobium japonicum.

P G Roessler, K D Nadler
PMCID: PMC216491  PMID: 6277847

Abstract

The effects of iron deficiency on heme biosynthesis in Rhizobium japonicum were examined. Iron-deficient cells had a decreased maximum cell yield and a decreased cytochrome content and excreted protoporphyrin into the growth medium. The activities of the first two enzymes of heme biosynthesis, delta-aminolevulinic acid synthase (EC 2.3.1.37) and delta-aminolevulinic acid dehydrase (EC 4.2.1.24), were diminished in iron-deficient cells, but were returned to normal levels upon addition of iron to the cultures. The addition of iron salts, iron chelators, hemin, or protoporphyrin to cell-free extracts did not affect the activity of these enzymes. The addition of levulinic acid to iron-deficient cultures blocked protoporphyrin excretion and also resulted in high delta-aminolevulinic acid synthase and delta-aminolevulinic acid dehydrase activities. These results suggest the possibility that rhizobial heme biosynthesis in the legume root nodule may be affected by the release of iron from the host plant to the bacteroids.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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