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Related Experiment Videos

Immunological relationship among hydrogenases.

K L Kovacs1, L C Seefeldt, G Tigyi

  • 1Department of Biochemistry, University of Georgia, Athens 30602.

Journal of Bacteriology
|January 1, 1989
PubMed
Summary
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Immunological studies reveal distinct subunits in nickel-iron (Ni-Fe) hydrogenases, with conserved regions in large subunits but less conservation in small subunits across species. Iron-only (Fe-only) hydrogenases show varied cross-reactivity, indicating unique evolutionary paths.

Area of Science:

  • Biochemistry
  • Immunology
  • Microbial Physiology

Background:

  • Hydrogenases are crucial enzymes catalyzing hydrogen oxidation or evolution.
  • Understanding hydrogenase structure-function relationships is vital for bioenergy applications.
  • Immunological comparisons can reveal evolutionary relationships and conserved domains.

Purpose of the Study:

  • To investigate immunological cross-reactivity among diverse hydrogenase antigens and antibodies.
  • To explore the immunological distinctness of hydrogenase subunits.
  • To assess interspecies conservation and relationships among different hydrogenase types.

Main Methods:

  • Utilized 11 different hydrogenase antigens and 9 different hydrogenase antibodies.
  • Examined antibodies and antigens from both subunits of Ni-Fe hydrogenases from Bradyrhizobium japonicum and Thiocapsa roseopersicina.

Related Experiment Videos

  • Tested cross-reactivity between antibodies to Clostridium pasteurianum hydrogenases and other Fe-only and Ni-Fe hydrogenases.

    • Main Results:

    • Demonstrated strong immunological relationships among Ni-Fe dimeric hydrogenases.
    • Showed that the 60-kDa and 30-kDa subunits of Ni-Fe hydrogenases are immunologically distinct.
    • Identified conserved regions in large subunits across species, while small subunits showed less conservation.
    • Observed cross-reactivity between antibodies to Clostridium pasteurianum bidirectional hydrogenase and Desulfovibrio vulgaris bidirectional hydrogenase.
    • Found surprising cross-reactivity of clostridial uptake hydrogenase antibodies with Ni-Fe hydrogenases, but not Fe-only hydrogenases.
    • Highlighted significant immunological differences between the two hydrogenases from C. pasteurianum.

    Conclusions:

    • Ni-Fe hydrogenase subunits possess distinct immunological properties, suggesting specific functional roles.
    • Conserved epitopes in large subunits facilitate interspecies cross-reactivity, indicating functional importance.
    • Fe-only and Ni-Fe hydrogenases exhibit diverse immunological profiles, reflecting distinct evolutionary trajectories.
    • The immunological data provide insights into hydrogenase structure, function, and evolution.