Novel flavohemoglobins of mycobacteria

Sanjay Gupta, Sudesh Pawaria, Changyuan Lu, Syun Ru Yeh, Kanak L. Dikshit

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Flavohemoglobins (flavoHbs) constitute a distinct class of chimeric hemoglobins in which a globin domain is coupled with a ferredoxin reductase such as FAD- and NADH-binding modules. Structural features and active site of heme and reductase domains are highly conserved in various flavoHbs. A new class of flavoHbs, displaying crucial differences in functionally conserved regions of heme and reductase domains, have been identified in mycobacteria. Mining of microbial genome data indicated that the occurrence of such flavoHbs might be restricted to a small group of microbes unlike conventional flavoHbs that are widespread among prokaryotes and lower eukaryotes. One of the representative flavoHbs of this class, encoded by Rv0385 gene (MtbFHb) of Mycobacterium tuberculosis, has been cloned, expressed, and characterized. The ferric and deoxy spectra of MtbFHb displayed a hexacoordinate state indicating that its distal site may be occupied by an intrinsic amino acid or an external ligand and it may not be involved in nitric oxide detoxification. Phylogenetic analysis revealed that mycobacterial flavoHbs constitute a separate cluster distinct from conventional flavoHbs and may have novel function(s).

Original languageEnglish (US)
Pages (from-to)337-345
Number of pages9
JournalIUBMB Life
Issue number5
StatePublished - May 2011


  • electron-transfer
  • flavohemoglobin
  • mycobacteria
  • nitric-oxide dioxygenase
  • phylogeny

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Genetics
  • Clinical Biochemistry
  • Cell Biology


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