Part:BBa_K1438000

Bacterioferritin (BFR)

Bacterioferritins are the E. coli cells natural iron storage proteins. These hollow nearly spherical protein shells detoxify the cell by sequestering excessive iron and forming Iron(III)hydroxid-oxide particels.

Bacterioferritin is an heam containing bacterial ferritin. Each heme is bound in a pocked formed by the interface between a pair of symmetry-related subunits [1]. However, it was investigated that these heme groups may be involved in the release of iron out of the ferritin iron core by forming an heme-mediated electron transfer to reduce immobilized Fe3+ to more soluble Fe2+.

[1] Frolow F, Kalb AJ, Yariv J. Structure of a unique twofold symmetric haem-binding site. Nat Struct Biol. 1994 Jul;1(7):453-60. PubMed PMID: 7664064.

[2] Yao H, Wang Y, Lovell S, Kumar R, Ruvinsky AM, Battaile KP, Vakser IA, Rivera M. The structure of the BfrB-Bfd complex reveals protein-protein interactions enabling iron release from bacterioferritin. J Am Chem Soc. 2012 Aug 15;134(32):13470-81. doi: 10.1021/ja305180n. Epub 2012 Aug 1. PubMed PMID: 22812654; PubMed Central PMCID: PMC3428730.

Usage and Biology

SDS PAGE

We succesfully expressed bacterioferritin in E. coli DH10b using our BFR expression Device ( BBa_K1438020 )

After induction with 1mM IPTG bacterioferritin (BFR) was expressed in DH10b over night. Bacterioferritin subunits were expected at a molecular weight of 19,7 kDa

Improving BFRs Iron Storage Properties

We constructed a improved version of this protein by site-directed Mutagenesis (M52H) and add it to the parts registry as BBa_K1438001.

== Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BamHI site found at 34
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  INCOMPATIBLE WITH RFC[1000]

  Illegal BsaI site found at 142