Cyclophilins (CyPs) are ubiquitous proteins involved in a wide variety of processes including protein maturation and trafficking, receptor complex stabilization, apoptosis, receptor signaling, RNA processing, and spliceosome assembly. The ubiquitous presence is justified by their peptidyl-prolyl cis-trans isomerase (PPIase) activity, catalyzing the rotation of X-Pro peptide bonds from a cis to a trans conformation, a critical rate-limiting step in protein folding, as over 90% of proteins contain trans prolyl imide bonds. In Arabidopsis 35 CyPs involved in plant development have been reported, showing different subcellular localizations and tissue- and stage-specific expression. In the present work, we focused on the localization of CyPs in pear (Pyrus communis) pollen, a model system for studies on pollen tube elongation and on pollen-pistil self-incompatibility response. Fluorescent, confocal and immuno-electron microscopy showed that this protein is present in the cytoplasm, organelles and cell wall, as confirmed by protein fractionation. Moreover, an 18-kDa CyP isoform was specifically released extracellularly when pear pollen was incubated with the Ca2+ chelator EGTA.

Parrotta, L., Aloisi, I., Suanno, C., Faleri, C., Kielbowicz-Matuk, A., Bini, L., et al. (2019). A low molecular-weight cyclophilin localizes in different cell compartments of Pyrus communis pollen and is released in vitro under Ca2+ depletion. PLANT PHYSIOLOGY AND BIOCHEMISTRY, 144, 197-206 [10.1016/j.plaphy.2019.09.045].

A low molecular-weight cyclophilin localizes in different cell compartments of Pyrus communis pollen and is released in vitro under Ca2+ depletion

Parrotta L.;Faleri C.;Bini L.;Cai G.;
2019-01-01

Abstract

Cyclophilins (CyPs) are ubiquitous proteins involved in a wide variety of processes including protein maturation and trafficking, receptor complex stabilization, apoptosis, receptor signaling, RNA processing, and spliceosome assembly. The ubiquitous presence is justified by their peptidyl-prolyl cis-trans isomerase (PPIase) activity, catalyzing the rotation of X-Pro peptide bonds from a cis to a trans conformation, a critical rate-limiting step in protein folding, as over 90% of proteins contain trans prolyl imide bonds. In Arabidopsis 35 CyPs involved in plant development have been reported, showing different subcellular localizations and tissue- and stage-specific expression. In the present work, we focused on the localization of CyPs in pear (Pyrus communis) pollen, a model system for studies on pollen tube elongation and on pollen-pistil self-incompatibility response. Fluorescent, confocal and immuno-electron microscopy showed that this protein is present in the cytoplasm, organelles and cell wall, as confirmed by protein fractionation. Moreover, an 18-kDa CyP isoform was specifically released extracellularly when pear pollen was incubated with the Ca2+ chelator EGTA.
2019
Parrotta, L., Aloisi, I., Suanno, C., Faleri, C., Kielbowicz-Matuk, A., Bini, L., et al. (2019). A low molecular-weight cyclophilin localizes in different cell compartments of Pyrus communis pollen and is released in vitro under Ca2+ depletion. PLANT PHYSIOLOGY AND BIOCHEMISTRY, 144, 197-206 [10.1016/j.plaphy.2019.09.045].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1080209