Part:BBa_K1321200

J23101+B0034+VHb (Vitreoscilla haemoglobin)

This part is a haemoglobin isolated from Vitreoscilla (VHb) expressed behind a strong Anderson promoter and a strong RBS. VHb is a monomeric heme-containing protein that appears to improve the metabolic function of obligate aerobes and facultative anaerobes in low-oxygen conditions[3][4][5][6]. Evidence suggests that the protein binds oxygen, then shuttles it to at least one cytochrome in the electron transport chain[7], improving the rate of oxidative phosphorylation and therefore ATP production even when dissolved oxygen is scarce, resulting in increased cell metabolism. This part contains a constitute promoter and RBS ready for expression.

Expressing BBa_K1321200 in pSEVA331-Bb backbone (part BBa_K1321300) in the cellulose-producing Gluconacetobacter xylinus strain igem (part BBa_K1321306; grown at 30degC 180rpm in 5ml HS-cellulase medium, in 50ml tubes for 4 days) increases biomass production almost two-fold (see Figure 1).

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Figure 1. Effects of Vitreoscilla hemoglobin expression on G.xylinus maximum biomass production. G.xylinus igem wild type cells and cells transformed with pSEVA331-BBa_K1321200 plasmid were cultured in 5ml of HS-cellulase medium (in 50ml Falcon tubes with loose caps) at 30degC, 180rpm shaking for 4 days, after which OD600 was measured. Samples were diluted 1:1 in HS-cellulase medium before measurement. Negative controls (HS-cellulase medium without inoculations) showed no growth (not shown here). N=3 (Vhb), 4 (wild-type), error bars denote SD.

Sequence and Features

Assembly Compatibility:

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

  Illegal NheI site found at 7
  Illegal NheI site found at 30
  
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BglII site found at 477
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]