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Molecular and General Genetics MGG

, Volume 216, Issue 2–3, pp 303–314 | Cite as

Heme-deficient mutants of Salmonella typhimurium: Two genes required for ALA synthesis

  • Thomas Elliott
  • John R. Roth
Article

Summary

The first step in heme biosynthesis is the formation of 5-aminolevulinic acid (ALA). We have isolated, mapped and characterized a large number of Salmonella typhimurium mutants auxotrophic for ALA. These mutants carry defects in either one of two genes, both required for ALA synthesis. The previously identified hemA gene maps at 35 min, and the hemL gene maps at 5 min on the S. typhimurium genetic map. Mutants in hemA and hemL are defective for aerobic and anaerobic respiration, and appear to be oxygen sensitive. The Hem phenotype of hemL mutants is less severe than that of hemA mutants. Although hemA and hemL mutants are deficient in heme synthesis, genetic tests indicate that they still synthesize two minor products of the heme pathway, siroheme and cobalamin (vitamin B12), under anaerobic conditions. In contrast, hemB, hemC and cysG mutants, blocked after ALA synthesis, make neither siroheme nor vitamin B12. Double mutants defective in both hemA and hemL also make siroheme. We suggest that hemA and hemL are required for one route of ALA synthesis and that a second, minor route of ALA synthesis may operate in S. typhimurium; this second pathway would be independent of the hemA and hemL functions.

Key words

Salmonella Heme ALA hemA hemL 

Abbreviations

Amp

ampicillin

Cam

chloramphenicol

Kan

kanamycin

Tet

tetracycline

Str

streptomycin

X-gal

5-bromo-4-chloro-3-indolyl-β-d-galactoside

DES

diethyl sulfate

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Thomas Elliott
    • 1
  • John R. Roth
    • 1
  1. 1.Department of BiologyUniversity of UtahSalt Lake CityUSA

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