scholarly journals FKBP52 overexpression accelerates hippocampal-dependent memory impairments in a tau transgenic mouse model

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Marangelie Criado-Marrero ◽  
Niat T. Gebru ◽  
Lauren A. Gould ◽  
Danielle M. Blazier ◽  
Yamile Vidal-Aguiar ◽  
...  
Keyword(s):  
Neurofibrillary Tangle ◽  
Neuronal Loss ◽  
Long Term Potentiation ◽  
Tau Phosphorylation ◽  
Ppiase Activity ◽  
Memory Impairments ◽  
Learning Impairments ◽  
Fk506 Binding Protein ◽  
Abnormal Accumulation

AbstractAbnormal accumulation of hyperphosphorylated tau induces pathogenesis in neurodegenerative diseases, like Alzheimer’s disease. Molecular chaperones with peptidyl-prolyl cis/trans isomerase (PPIase) activity are known to regulate these processes. Previously, in vitro studies have shown that the 52 kDa FK506-binding protein (FKBP52) interacts with tau inducing its oligomerization and fibril formation to promote toxicity. Thus, we hypothesized that increased expression of FKBP52 in the brains of tau transgenic mice would alter tau phosphorylation and neurofibrillary tangle formation ultimately leading to memory impairments. To test this, tau transgenic (rTg4510) and wild-type mice received bilateral hippocampal injections of virus overexpressing FKBP52 or GFP control. We examined hippocampal-dependent memory, synaptic plasticity, tau phosphorylation status, and neuronal health. This work revealed that rTg4510 mice overexpressing FKBP52 had impaired spatial learning, accompanied by long-term potentiation deficits and hippocampal neuronal loss, which was associated with a modest increase in total caspase 12. Together with previous studies, our findings suggest that FKBP52 may sensitize neurons to tau-mediated dysfunction via activation of a caspase-dependent pathway, contributing to memory and learning impairments.

scholarly journals FK506 Binding Protein from the Hyperthermophilic Archaeon Pyrococcus horikoshii Suppresses the Aggregation of Proteins in Escherichia coli

2002 ◽  
Vol 68 (2) ◽  
pp. 464-469 ◽  
Author(s):  
Akira Ideno ◽  
Masahiro Furutani ◽  
Yoshitaka Iba ◽  
Yoshikazu Kurosawa ◽  
Tadashi Maruyama
Keyword(s):  
Escherichia Coli ◽  
Protein Folding ◽  
Binding Protein ◽  
Fab Fragment ◽  
Ppiase Activity ◽  
Pyrococcus Horikoshii ◽  
E Coli ◽  
Fk506 Binding Protein ◽  
Soluble Recombinant Protein

ABSTRACT The 29-kDa FK506 binding protein (FKBP) gene is the only peptidyl-prolyl cis-trans isomerase (PPIase) gene in the genome of Pyrococcus horikoshii. We characterized the function of this FKBP (PhFKBP29) and used it to increase the production yield of soluble recombinant protein in Escherichia coli. The PPIase activity (k cat/Km ) of PhFKBP29 was found to be much lower than that of other archaeal 16- to 18-kDa FKBPs by a chymotrypsin-coupled assay of the oligo-peptidyl substrate at 15�C. Besides this low PPIase activity, PhFKBP29 showed chaperone-like protein folding activity which enhanced the refolding yield of chemically unfolded rhodanese in vitro. In addition, it suppressed thermal protein aggregation in a temperature range of 45 to 100�C. When the PhFKBP29 gene was coexpressed with the recombinant Fab fragment gene of the anti-hen egg lysozyme antibody in the cytoplasm of E. coli, whose expressed product tended to form an inactive aggregate in E. coli, it improved the yield of the soluble Fab fragments with antibody specificity. PhFKBP29 exerted protein folding and aggregation suppression in E. coli cells.

scholarly journals Hsp90 co-chaperones, FKBP52 and Aha1, promote tau pathogenesis in aged wild-type mice

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Marangelie Criado-Marrero ◽  
Niat T. Gebru ◽  
Danielle M. Blazier ◽  
Lauren A. Gould ◽  
Jeremy D. Baker ◽  
...  
Keyword(s):  
Neuronal Loss ◽  
Hippocampal Volume ◽  
Brain Regions ◽  
Aging Brain ◽  
Protein Homeostasis ◽  
Wild Type ◽  
Fk506 Binding Protein ◽  
Intrinsically Disordered ◽  
Tau Aggregation

AbstractThe microtubule associated protein tau is an intrinsically disordered phosphoprotein that accumulates under pathological conditions leading to formation of neurofibrillary tangles, a hallmark of Alzheimer’s disease (AD). The mechanisms that initiate the accumulation of phospho-tau aggregates and filamentous deposits are largely unknown. In the past, our work and others’ have shown that molecular chaperones play a crucial role in maintaining protein homeostasis and that imbalance in their levels or activity can drive tau pathogenesis. We have found two co-chaperones of the 90 kDa heat shock protein (Hsp90), FK506-binding protein 52 (FKBP52) and the activator of Hsp90 ATPase homolog 1 (Aha1), promote tau aggregation in vitro and in the brains of tau transgenic mice. Based on this, we hypothesized that increased levels of these chaperones could promote tau misfolding and accumulation in the brains of aged wild-type mice. We tested this hypothesis by overexpressing Aha1, FKBP52, or mCherry (control) proteins in the hippocampus of 9-month-old wild-type mice. After 7 months of expression, mice were evaluated for cognitive and pathological changes. Our results show that FKBP52 overexpression impaired spatial reversal learning, while Aha1 overexpression impaired associative learning in aged wild-type mice. FKBP52 and Aha1 overexpression promoted phosphorylation of distinct AD-relevant tau species. Furthermore, FKBP52 activated gliosis and promoted neuronal loss leading to a reduction in hippocampal volume. Glial activation and phospho-tau accumulation were also detected in areas adjacent to the hippocampus, including the entorhinal cortex, suggesting that after initiation these pathologies can propagate through other brain regions. Overall, our findings suggest a role for chaperone imbalance in the initiation of tau accumulation in the aging brain.

Molecular determinants of Drosophila immunophilin FKBP39 nuclear localization

2018 ◽  
Vol 399 (5) ◽  
pp. 467-484 ◽  
Author(s):  
Marek Orłowski ◽  
Katarzyna Popławska ◽  
Joanna Pieprzyk ◽  
Aleksandra Szczygieł-Sommer ◽  
Anna Więch ◽  
...  
Keyword(s):  
Nuclear Localization ◽  
Fluorescent Protein ◽  
Yellow Fluorescent Protein ◽  
Nuclear Targeting ◽  
Ppiase Activity ◽  
Fusion Construct ◽  
Fk506 Binding Protein ◽  
Molecular Determinants

AbstractFK506-binding proteins (FKBPs) belong to a distinct class of immunophilins that interact with immunosuppressants. They use their peptidyl-prolyl isomerase (PPIase) activity to catalyze thecis-transconversion of prolyl bonds in proteins during protein-folding events. FKBPs also act as a unique group of chaperones. TheDrosophila melanogasterpeptidyl-prolylcis-transisomerase FK506-binding protein of 39 kDa (FKBP39) is thought to act as a transcriptional modulator of gene expression in 20-hydroxyecdysone and juvenile hormone signal transduction. The aim of this study was to analyze the molecular determinants responsible for the subcellular distribution of an FKBP39-yellow fluorescent protein (YFP) fusion construct (YFP-FKBP39). We found that YFP-FKBP39 was predominantly nucleolar. To identify the nuclear localization signal (NLS), a series of YFP-tagged FKBP39 deletion mutants were prepared and examinedin vivo. The identified NLS signal is located in a basic domain. Detailed mutagenesis studies revealed that residues K188 and K191 are crucial for the nuclear targeting of FKBP39 and its nucleoplasmin-like (NPL) domain contains the sequence that controls the nucleolar-specific translocation of the protein. These results show that FKBP39 possesses a specific NLS in close proximity to a putative helix-turn-helix (HTH) motif and FKBP39 may bind DNAin vivoandin vitro.

scholarly journals A novel missense variant in ACAA1 contributes to early-onset Alzheimer’s disease, impairs lysosomal function, and facilitates amyloid-β pathology and cognitive decline

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Rongcan Luo ◽  
Yu Fan ◽  
Jing Yang ◽  
Maosen Ye ◽  
Deng-Feng Zhang ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Early Onset ◽  
Neurofibrillary Tangle ◽  
Amyloid Β ◽  
Neuronal Loss ◽  
Missense Variant ◽  
Lysosomal Function

AbstractAlzheimer’s disease (AD) is characterized by progressive synaptic dysfunction, neuronal death, and brain atrophy, with amyloid-β (Aβ) plaque deposits and hyperphosphorylated tau neurofibrillary tangle accumulation in the brain tissue, which all lead to loss of cognitive function. Pathogenic mutations in the well-known AD causal genes including APP, PSEN1, and PSEN2 impair a variety of pathways, including protein processing, axonal transport, and metabolic homeostasis. Here we identified a missense variant rs117916664 (c.896T>C, p.Asn299Ser [p.N299S]) of the acetyl-CoA acyltransferase 1 (ACAA1) gene in a Han Chinese AD family by whole-genome sequencing and validated its association with early-onset familial AD in an independent cohort. Further in vitro and in vivo evidence showed that ACAA1 p.N299S contributes to AD by disturbing its enzymatic activity, impairing lysosomal function, and aggravating the Aβ pathology and neuronal loss, which finally caused cognitive impairment in a murine model. Our findings reveal a fundamental role of peroxisome-mediated lysosomal dysfunction in AD pathogenesis.

scholarly journals Biochemical and Functional Analyses of the Mip Protein: Influence of the N-Terminal Half and of Peptidylprolyl Isomerase Activity on the Virulence of Legionella pneumophila

2003 ◽  
Vol 71 (8) ◽  
pp. 4389-4397 ◽  
Author(s):  
Rolf Köhler ◽  
Jörg Fanghänel ◽  
Bettina König ◽  
Edeltraud Lüneberg ◽  
Matthias Frosch ◽  
...  
Keyword(s):  
Legionella Pneumophila ◽  
Guinea Pigs ◽  
Acanthamoeba Castellanii ◽  
Ppiase Activity ◽  
Isomerase Activity ◽  
Fk506 Binding Protein ◽  
Terminal Domain ◽  
Α Helix ◽  
Functional Analyses

ABSTRACT The virulence factor Mip (macrophage infectivity potentiator) contributes to the intracellular survival of Legionella pneumophila, the causative agent of Legionnaires' disease. The protein consists of two domains that are connected via a very long α-helix (A. Riboldi-Tunnicliffe et al., Nat. Struct. Biol. 8:779-783, 2001). The fold of the C-terminal domain (residues 100 to 213) is closely related to human FK506-binding protein (FKBP12), and like FKBP12, Mip exhibits peptidylprolyl cis/trans isomerase (PPIase) activity. The α-helical N-terminal domain is responsible for the formation of very stable Mip homodimers. In order to determine the importance of the homodimeric state of Mip for its biochemical activities and for infectivity of Legionella, a truncated, monomeric Mip variant [Mip(77-213)] was overexpressed in Escherichia coli and characterized biochemically. In vitro isomerase activity assays revealed that the altered protein exhibits full isomerase activity towards peptide substrates. However, the deletion resulted in a dramatic loss in the efficiency of refolding of reduced and carboxy-methylated RNase T1. By cis complementation of the Mip-negative mutant strain L. pneumophila JR32-2, we constructed the strain L. pneumophila JR32-2.4, which expresses an N-terminally truncated variant of Mip. Infection studies with these strains revealed that the N-terminal part and the dimerization of Mip but not its PPIase activity are necessary for full virulence in Acanthamoeba castellanii. Infection of guinea pigs showed that strains with dimerization-deficient Mip (JR32-2.4) or a very low PPIase activity (JR32-2.2) were significantly attenuated in the animal model. These results suggest a different role of the PPIase activity and the N-terminally mediated dimeric state of Mip in monocellular systems and during the infection of guinea pigs.

scholarly journals Neurogranin Regulates Adult-Born Olfactory Granule Cell Spine Density and Odor-Reward Associative Memory in Mice

2021 ◽  
Vol 22 (8) ◽  
pp. 4269
Author(s):  
Simona Gribaudo ◽  
Daniele Saraulli ◽  
Giulia Nato ◽  
Sara Bonzano ◽  
Giovanna Gambarotta ◽  
...  
Keyword(s):  
Associative Memory ◽  
Molecular Mechanisms ◽  
Granule Cells ◽  
Large Population ◽  
Adult Life ◽  
Long Term Potentiation ◽  
Spine Density ◽  
Knock Out ◽  
Memory Impairments ◽  
Dependent Learning

Neurogranin (Ng) is a brain-specific postsynaptic protein, whose role in modulating Ca2+/calmodulin signaling in glutamatergic neurons has been linked to enhancement in synaptic plasticity and cognitive functions. Accordingly, Ng knock-out (Ng-ko) mice display hippocampal-dependent learning and memory impairments associated with a deficit in long-term potentiation induction. In the adult olfactory bulb (OB), Ng is expressed by a large population of GABAergic granule cells (GCs) that are continuously generated during adult life, undergo high synaptic remodeling in response to the sensory context, and play a key role in odor processing. However, the possible implication of Ng in OB plasticity and function is yet to be investigated. Here, we show that Ng expression in the OB is associated with the mature state of adult-born GCs, where its active-phosphorylated form is concentrated at post-synaptic sites. Constitutive loss of Ng in Ng-ko mice resulted in defective spine density in adult-born GCs, while their survival remained unaltered. Moreover, Ng-ko mice show an impaired odor-reward associative memory coupled with reduced expression of the activity-dependent transcription factor Zif268 in olfactory GCs. Overall, our data support a role for Ng in the molecular mechanisms underlying GC plasticity and the formation of olfactory associative memory.

scholarly journals FK506-binding protein 5 promotes the progression of papillary thyroid carcinoma

2021 ◽  
Vol 49 (4) ◽  
pp. 030006052110083
Author(s):  
Zhenya Gao ◽  
Fang Yu ◽  
Huanxia Jia ◽  
Zhuo Ye ◽  
Shijie Yao
Keyword(s):  
Papillary Thyroid Carcinoma ◽  
Thyroid Carcinoma ◽  
Binding Protein ◽  
Progression Free Survival ◽  
Papillary Thyroid ◽  
Expression Levels ◽  
Fk506 Binding Protein ◽  
Normal Tissues ◽  
Induced Apoptosis

Objective To detect the expression of FK506-binding protein 5 (FKBP5) in human papillary thyroid carcinoma (PTC) tissues, and explore its possible role in the progression of PTC. Methods FKBP5 expression levels were assessed in 115 PTC tissues and corresponding normal tissues by immunohistochemistry. We also examined the correlations between FKBP5 expression and clinicopathological factors and survival in 75 patients with PTC. The effects of FKBP5 on the proliferation and apoptosis of PTC cells were detected by colony-formation, MTT, and flow cytometry assays, respectively. We further investigated the effects of FKBP5 on tumor growth in mice. Results We revealed high expression levels of FKBP5 in human PTC tissues compared with normal tissues. Furthermore, high FKBP5 expression was associated with an increased incidence of intraglandular dissemination, and lower overall and progression-free survival. FKBP5 depletion remarkably suppressed the proliferation and induced apoptosis of PTC cells in vitro. FKBP5 further contributed to the growth of PTC tumors in mice. Conclusions The results of this study demonstrated the potential involvement of FKBP5 in the progression of PTC, and confirmed FKBP5 as a novel therapeutic target for PTC treatment.

scholarly journals Impact of Fatty Acid-Binding Proteins in α-Synuclein-Induced Mitochondrial Injury in Synucleinopathy

Biomedicines ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 560
Author(s):  
An Cheng ◽  
Wenbin Jia ◽  
Ichiro Kawahata ◽  
Kohji Fukunaga
Keyword(s):  
Fatty Acid ◽  
Binding Proteins ◽  
Neuronal Loss ◽  
Krabbe Disease ◽  
Fatty Acid Binding Proteins ◽  
Mitochondrial Outer Membrane ◽  
Fatty Acid Binding ◽  
Mitochondrial Injury ◽  
Abnormal Accumulation ◽  
The Brain

Synucleinopathies are diverse diseases with motor and cognitive dysfunction due to progressive neuronal loss or demyelination, due to oligodendrocyte loss in the brain. While the etiology of neurodegenerative disorders (NDDs) is likely multifactorial, mitochondrial injury is one of the most vital factors in neuronal loss and oligodendrocyte dysfunction, especially in Parkinson’s disease, dementia with Lewy body, multiple system atrophy, and Krabbe disease. In recent years, the abnormal accumulation of highly neurotoxic α-synuclein in the mitochondrial membrane, which leads to mitochondrial dysfunction, was well studied. Furthermore, fatty acid-binding proteins (FABPs), which are members of a superfamily and are essential in fatty acid trafficking, were reported to trigger α-synuclein oligomerization in neurons and glial cells and to target the mitochondrial outer membrane, thereby causing mitochondrial loss. Here, we provide an updated overview of recent findings on FABP and α-synuclein interactions and mitochondrial injury in NDDs.

scholarly journals Protein kinase D promotes plasticity-induced F-actin stabilization in dendritic spines and regulates memory formation

2015 ◽  
Vol 210 (5) ◽  
pp. 771-783 ◽  
Author(s):  
Norbert Bencsik ◽  
Zsófia Szíber ◽  
Hanna Liliom ◽  
Krisztián Tárnok ◽  
Sándor Borbély ◽  
...  
Keyword(s):  
Synaptic Plasticity ◽  
Protein Kinase ◽  
Dendritic Spines ◽  
Morphological Changes ◽  
Long Term Potentiation ◽  
Memory Formation ◽  
Protein Kinase D

Actin turnover in dendritic spines influences spine development, morphology, and plasticity, with functional consequences on learning and memory formation. In nonneuronal cells, protein kinase D (PKD) has an important role in stabilizing F-actin via multiple molecular pathways. Using in vitro models of neuronal plasticity, such as glycine-induced chemical long-term potentiation (LTP), known to evoke synaptic plasticity, or long-term depolarization block by KCl, leading to homeostatic morphological changes, we show that actin stabilization needed for the enlargement of dendritic spines is dependent on PKD activity. Consequently, impaired PKD functions attenuate activity-dependent changes in hippocampal dendritic spines, including LTP formation, cause morphological alterations in vivo, and have deleterious consequences on spatial memory formation. We thus provide compelling evidence that PKD controls synaptic plasticity and learning by regulating actin stability in dendritic spines.

scholarly journals Activity of the Ste20-like kinase, SLK, is enhanced by homodimerization

2011 ◽  
Vol 301 (3) ◽  
pp. F554-F564 ◽  
Author(s):  
Sierra Delarosa ◽  
Julie Guillemette ◽  
Joan Papillon ◽  
Ying-Shan Han ◽  
Arnold S. Kristof ◽  
...  
Keyword(s):  
Catalytic Domain ◽  
Gel Filtration ◽  
Coiled Coil ◽  
Kinase Domain ◽  
Kinase Assay ◽  
Luciferase Reporter ◽  
Fk506 Binding Protein ◽  
Induced Apoptosis ◽  
Injury And Repair

The expression and activation of the Ste20-like kinase, SLK, is increased during renal development and recovery from ischemic acute renal failure. SLK promotes apoptosis, and during renal injury and repair, transcriptional induction or posttranscriptional control of SLK may, therefore, regulate cell survival. SLK contains protein interaction (coiled-coil) domains, suggesting that posttranslational homodimerization may also modulate SLK activity. We therefore expressed coiled-coil regions in the C-terminal domain of SLK as fusion proteins and demonstrated their homodimerization. By gel-filtration chromatography, endogenous and heterologously expressed SLK were detected in a macromolecular protein complex. To test the role of homodimerization in kinase activation, we constructed a fusion protein consisting of the SLK catalytic domain (amino acids 1–373) and a modified FK506 binding protein, Fv (Fv-SLK 1–373). Addition of AP20187 (an analog of FK506) enhanced the homodimerization of Fv-SLK 1–373. In an in vitro kinase assay, the dimeric Fv-SLK 1–373 displayed greater kinase activity than the monomeric form. In cells expressing Fv-SLK 1–373, homodimerization increased activation-specific phosphorylation of the proapoptotic kinases, c-Jun N-terminal kinase and p38 kinase. Compared with the monomer, dimeric Fv-SLK 1–373 enhanced the activation of a Bax promoter-luciferase reporter. Finally, expression of Fv-SLK 1–373 induced apoptosis, and the effect was increased by homodimerization. Thus the activity, downstream signaling, and functional effects of SLK are enhanced by dimerization of the kinase domain.

Sign in / Sign up

Export Citation Format

Share Document