Anti-TdT/DNTT Antibody Picoband® Fluoro550 Conjugated

Terminal Deoxynucleotidyl Transferase, also known as TDT and terminal transferase, is a unique DNA polymerase without template ion catalyzes the addition of deoxyribonucleotides onto the 3-prime-hydroxyl end of DNA primers. Its gene is mapped to the region 10q23-q24. And TDT cDNA contains an open reading frame of 1,530 basepairs corresponding to a protein containing 510 amino acids. TDT may be responsible for inserting nucleotides (N regions) at the V (H) -D and D-J (H) junctions of immunoglobulin genes. The enzyme is present in immature thymocytes, some bone marrow cells, transformed pre-B and pre-T cell lines, and leukemia cells. Additionally, TDT catalyses the addition of nucleotides to the 3' terminus of a DNA molecule. Unlike most DNA polymerases it does not require a template. The preferred substrate of this enzyme is a 3'-overhang, but it can also add nucleotides to blunt or recessed 3' ends. Cobalt is a necessary cofactor.

Template-independent DNA polymerase which catalyzes the random addition of deoxynucleoside 5'-triphosphate to the 3'-end of a DNA initiator. One of the in vivo functions of this enzyme is the addition of nucleotides at the junction (N region) of rearranged Ig heavy chain and T-cell receptor gene segments during the maturation of B- and T-cells. .

1. Landau, N. R.; St. John, T. P.; Weissman, I. L.; Wolf, S. C.; Silverstone, A. E.; Baltimore, D. : Cloning of terminal transferase cDNA by antibody screening. Proc. Nat. Acad. Sci. 81: 5836-5840, 1984. 2. Yang-Feng, T. L.; Landau, N. R.; Baltimore, D.; Francke, U.: The terminal deoxynucleotidyltransferase gene is located on human chromosome 10 (10q23-q24) and on mouse chromosome 19. Cytogenet. Cell Genet. 43: 121-126, 1986. 3. Riley, L. K.; Morrow, J. K.; Danton, M. J.; Coleman, M. S.: Human terminal deoxyribonucleotidyltransferase: molecular cloning and structural analysis of the gene and 5-prime flanking region. Proc. Nat. Acad. Sci. 85: 2489-2493, 1988.