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Related Experiment Video

Updated: May 23, 2026

Measurement of Heme Synthesis Levels in Mammalian Cells
09:43

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Published on: July 9, 2015

Heme A biosynthesis.

Lars Hederstedt1

  • 1Microbiology Group, Department of Biology, Lund University, Sweden. Lars.Hederstedt@biol.lu.se

Biochimica Et Biophysica Acta
|April 10, 2012
PubMed
Summary

Heme A is vital for respiration in many organisms. This review details the molecular mechanisms of heme A synthesis, focusing on heme A synthase in mitochondria and bacteria.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Respiration

Background:

  • Heme A is essential for respiration, acting as a prosthetic group in cytochrome a-based respiratory oxidases.
  • It differs from heme B (protoheme IX) by specific side group modifications: a hydroxyethylfarnesyl group at C2 and a formyl group at C8.
  • Heme A synthase, a membrane-bound monooxygenase, is responsible for forming the C8 formyl group but remains poorly understood.

Purpose of the Study:

  • To review the current understanding of heme A synthesis at the molecular level.
  • To elucidate the function and mechanism of heme A synthase.
  • To explore heme A biosynthesis in both mitochondria and aerobic bacteria.

Main Methods:

  • Review of existing literature on heme A synthesis.

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  • Analysis of the structural differences between heme A and heme B.
  • Focus on the enzymatic activity of heme A synthase.

    • Main Results:

    • Heme A is crucial for the function of respiratory enzyme complexes.
    • Heme A synthase catalyzes a key formylation step in heme A biosynthesis.
    • The review consolidates current knowledge on the molecular aspects of heme A production.

    Conclusions:

    • Understanding heme A synthesis is critical for comprehending cellular respiration.
    • Further research into heme A synthase is needed to fully elucidate its mechanism.
    • This review provides a foundational overview for studies on respiratory enzyme complex biogenesis.