• Purity

  >95%, by SDS-PAGE under reducing conditions and visualized by silver stain

• Endotoxin Level

  <0.01 EU per 1 μg of the protein by the LAL method.  

• Activity

  Measured by its ability to enhance neurite outgrowth of E16-E18 rat embryonic cortical neurons. Recombinant Human TAFA5/FAM19A5, immobilized at 6-24 μg/mL on a 96-well plate, is able to significantly enhance neurite outgrowth.

• Source

  E. coli-derived Gln26-Ser125

• Accession #

• N-terminal Sequence    
  Analysis

  Gln26

• Predicted Molecular Mass

  10.9 kDa

• SDS-PAGE

  11 kDa, reducing conditions

Background: TAFA5/FAM19A5

TAFA5 (also FAM19A5) is a 14 kDa type I transmembrane protein and member of the FAM19/TAFA family of chemokine-like proteins (1). Human TAFA5 is 132 amino acids (aa) in length (SwissProt #: Q7Z5A7). It contains a 15 aa extracellular domain, a 23 aa transmembrane sequence, and a 95 aa cytoplasmic region. Alternate splicing produces two additional isoforms. Isoform 2, a secreted form, has a 31 aa substitution for residues 1-38 in isoform 1. Isoform 3 has an eight aa substitution for residues 1-87 in isoform1. Human TAFA5 is 100% aa identical to mouse TAFA5 (1). Within the TAFA family, TAFA5 is the most distinct member, while TAFAs 2, 3, and 4 are the most closely related members (1). Real-time PCR analysis indicates that TAFA5 mRNA expression is restricted to the central nervous system (CNS), with the highest level in the basal ganglia and cerebellum (1). The biological functions of TAFA family members are not yet known, but there are a few tentative hypotheses. First, TAFAs may modulate immune responses in the CNS by functioning as brain-specific chemokines, and may act with other chemokines to optimize the recruitment and activity of immune cells in the CNS (1). Second, TAFAs may represent a novel class of neurokines that act as regulators of immune nervous cells (1, 2). Finally, TAFAs may control axonal sprouting following brain injury (1).

• References:

1. Tang, Y.T. et al. (2004) Genomics 83:727.

2. Benveniste, E. (1998) Cytokine Growth Factor Rev. 9:259.

• Long Name:

  Family with Sequence Similarity 19, Member A5

• Entrez Gene IDs:

  25817 (Human); 106014 (Mouse); 500915 (Rat)

• Alternate Names:

  Chemokine-like protein TAFA-5; FAM19A5; family with sequence similarity 19 (chemokine (C-C motif)-like), member A5; QLLK5208; TAFA protein 5; TAFA5; TAFA-5; UNQ5208