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Sanoguet Z, Campbell M, Ramos S, et al. Effects of Phosphorylation in Chlamydomonas Centrin Ser 167. Calcium Bind Proteins. 2006;1(2):108-114
Sanoguet, Z., Campbell, M., Ramos, S., Seda, C., Moreno, L. P., & Pastrana-Rios, B. (2006). Effects of Phosphorylation in Chlamydomonas Centrin Ser 167. Calcium binding proteins, 1(2), 108-114.
Sanoguet, Zuleika, et al. "Effects of Phosphorylation in Chlamydomonas Centrin Ser 167." Calcium binding proteins vol. 1,2 (2006): 108-114.
Sanoguet Z, Campbell M, Ramos S, Seda C, Moreno LP, Pastrana-Rios B. Effects of Phosphorylation in Chlamydomonas Centrin Ser 167. Calcium Bind Proteins. 2006;1(2):108-114. PMID: 22162668; PMCID: PMC3232031.
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Calcium Bind Proteins. 2006;1(2):108-114.

Effects of Phosphorylation in Chlamydomonas Centrin Ser 167.

Calcium binding proteins

Zuleika Sanoguet, Muriel Campbell, Sindia Ramos, Christina Seda, Luis Pérez Moreno, Belinda Pastrana-Rios

Affiliations

  1. Department of Chemistry; University of Puerto Rico; Mayagüez Campus; Mayagüez, USA.

PMID: 22162668 PMCID: PMC3232031

Abstract

Centrin is a conserved calcium binding protein belonging to the EF-hand superfamily with two independent structural domains. This protein is found to be phosphorylated near the carboxyl terminal end. Our goal was to perform a novel comparative study of phosphorylated and unphosphorylated centrin by Fourier transform infrared (FT-IR) spectroscopy, two-dimensional correlation spectroscopy (2D-COS) analysis and differential scanning calorimetry (DSC). To achieve this goal, we have bacterially expressed, isolated, purified and phosphorylated centrin. We verified the extent of phosphorylation to be >97% for centrin by MALDI MS analysis and determined the absence of aggregated protein. The thermal denaturation temperature and ΔCp were determined to be T(m) = 112.1 °C (ΔCp = 7.8 Kcal/mole/ΔC) and T(m) = 111.0°C (ΔCp = 5.0 Kcal/mole/°C) for holo-centrin and phosphorylated centrin, respectively. We have also described the molecular dynamics leading up to the thermal denaturation of the protein: for holo-centrin the vibrational modes associated with the calcium binding sites aspartates and glutamates, loops then the arginines, followed by the structured backbone vibrational modes the α-helix at 1635 cm(-1) then β-sheet and finally the more exposed α-helix at 1650 cm(-1); while for phosphorylated centrin aspartate, glutamate and arginine, followed by the backbone associated vibrational modes α-helix (1650 cm(-1)), loop then the β-sheet (1633 cm(-1)) and finally the α-helix (1637 cm(-1)). Therefore, the effect on domain stability due to phosphorylation at Ser(167) was observed in the loops as well as the α-helix at 1650 cm(-1).

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