Human DNA-binding peptidyl-prolyl cis/trans isomerase Par14 is cell cycle dependently expressed and associates with chromatin in vivo

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Abstract

Background: Par14, a member of the parvulin family of peptidyl-prolyl cis-trans isomerases that is involved in rRNA processing, microtubule formation and the glucose metabolism and has been suggested to play a role in chromatin remodeling on basis of sequence and structural identities to HMG proteins. Par14 is enriched in the nucleus and binds to double-stranded DNA in vitro. Results: By means of sub-nuclear biochemical fractionations, we demonstrate that cellular Par14 is associated with chromatin 3-fold higher than with the nuclear matrix in vivo. Par14 is released from the chromatin fraction after treatment with DNase I and elutes at high NaCl concentrations from the nucleic acid-binding fraction. Using qRT-PCR and western blotting we demonstrate that Par14 is up-regulated during the S and G2/M phases in synchronised human foreskin fibroblasts cells. Conclusion: In the light of our results, Par14 can be described as an endogenous non-histone chromatin protein, which binds DNA in vivo. We propose that Par14 is involved in a DNA-dependent activity such as transcription.

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Saningong, A. D., & Bayer, P. (2015). Human DNA-binding peptidyl-prolyl cis/trans isomerase Par14 is cell cycle dependently expressed and associates with chromatin in vivo. BMC Biochemistry, 16(1). https://doi.org/10.1186/s12858-015-0033-x

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