Tat-mediated protein transduction of human brain pyridoxal kinase into PC12 cells

Dae Won Kim, Chung Kwon Kim, Soo Hyun Choi, Hee Soon Choi, So Young Kim, Jae Jin An, Seung Ree Lee, Sun Hwa Lee, Oh Shin Kwon, Tae Cheon Kang, Moo Ho Won, Yong Joon Cho, Sung Woo Cho, Jung Hoon Kang, Tae Yoon Kim, Kil Soo Lee, Jinseu Park, Won Sik Eum, Soo Young Choi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Pyridoxal kinase (PK) catalyses the phosphorylation of vitamin B 6 to pyridoxal-5′-phosphate (PLP). A human brain PK gene was fused with a gene fragment encoding the HIV-1 Tat protein transduction domain (RKKRRQRRR) in a bacterial expression vector to produce a genetic in-frame Tat-PK fusion protein. The expressed and purified Tat-PK fusion proteins transduced efficiently into PC12 cells in a time- and dose-dependent manner when added exogenously in culture media. Once inside the cells, the transduced Tat-PK proteins showed catalytic activity and are stable for 48:h. The intracellular concentration of PLP, which is known as a biologically active form of vitamin B6, was increased by pre-treatment of Tat-PK to the PC12 cells. Those results suggest that the transduction of Tat-PK fusion protein can be one of the ways to regulate the PLP level and to replenish this enzyme in the various neurological disorders related to vitamin B6.

Original languageEnglish
Pages (from-to)481-487
Number of pages7
JournalBiochimie
Volume87
Issue number5
DOIs
StatePublished - May 2005

Keywords

  • Brain pyridoxal kinase
  • HIV-1 Tat
  • Protein therapy
  • Pyridoxal-5′-phosphate
  • Transduction

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