Part:BBa_K1319003

human galectin-3, codon optimized for E. coli

Galectin-3 is a 26 kDa protein that binds certain LPS patterns. It especially bind the O-section of the LPS.

Galectins are proteins of the lectin family, which posess carbonhydrate recognition domains binding specifically to β-galactoside sugar residues. In humans, 10 different galectines have been identified, among which is galectin-3.

Galectin-3 has a size of about 31 kDA and is encoded by a single gene, LGALS3. It has many physiological functions, such as cell adhesion, cell growth and differentiation, and contributes to the development of cancer, inflammation, fibrosis and others.

Human galectin-3 is a protein of the lectin-family that was shown to bind the LPS of multiple human pathogens. Some of them, including Pseudomonas aeruginosa protect themselves against the human immune system by mimicking the lipopolysaccharides (LPS) present on human erythrocytes.

Usage and Biology

K1319003 was used to create K1319020, a Galectin-mRFP fusion protein with a C-terminal His tag in the [http://2014.igem.org/Team:Heidelberg/Team/Collaborations Heidelberger expression vector] pSBX1A3.

We also cloned our K1319003 into the pET17 expression vector and expressed all combinations of fusion proteins in E. coli BL21(DE3). An SDS-PAGE showed that all fusion proteins were fully translated:

Pellets of different fusion protein expressions Expression in the pET17 vector was much more leaky than the expression in the pSBX vectors.

SDS-PAGE of K1319020 expression The fusion protein was fully translated to the correct molecular mass of 74 kDa.

Sequence and Features

Assembly Compatibility:

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

  Illegal NheI site found at 112
  
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]