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Feizy N, Leuchtenberg SF, Steiner C, Würtz B, Fliegner L, Huber A. In vivo identification of Drosophila rhodopsin interaction partners by biotin proximity labeling. Sci Rep 2024; 14:1986. [PMID: 38263196 PMCID: PMC10805788 DOI: 10.1038/s41598-024-52041-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 01/12/2024] [Indexed: 01/25/2024] Open
Abstract
Proteins exert their function through protein-protein interactions. In Drosophila, G protein-coupled receptors like rhodopsin (Rh1) interact with a G protein to activate visual signal transduction and with arrestins to terminate activation. Also, membrane proteins like Rh1 engage in protein-protein interactions during folding within the endoplasmic reticulum, during their vesicular transport and upon removal from the cell surface and degradation. Here, we expressed a Rh1-TurboID fusion protein (Rh1::TbID) in Drosophila photoreceptors to identify in vivo Rh1 interaction partners by biotin proximity labeling. We show that Rh1::TbID forms a functional rhodopsin that mediates biotinylation of arrestin 2 in conditions where arrestin 2 interacts with rhodopsin. We also observed biotinylation of Rh1::TbID and native Rh1 as well as of most visual signal transduction proteins. These findings indicate that the signaling components in the rhabdomere approach rhodopsin closely, within a range of ca. 10 nm. Furthermore, we have detected proteins engaged in the maturation of rhodopsin and elements responsible for the trafficking of membrane proteins, resembling potential interaction partners of Rh1. Among these are chaperons of the endoplasmic reticulum, proteins involved in Clathrin-mediated endocytosis as well as previously unnoticed contributors to rhodopsin transportation, such as Rab32, Vap33, or PIP82.
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Affiliation(s)
- Nilofar Feizy
- Department of Biochemistry, Institute of Biology, University of Hohenheim, Stuttgart, Germany
| | | | - Christine Steiner
- Department of Biochemistry, Institute of Biology, University of Hohenheim, Stuttgart, Germany
| | - Berit Würtz
- Mass Spectrometry Unit, Core Facility Hohenheim, University of Hohenheim, Stuttgart, Germany
| | - Leo Fliegner
- Department of Biochemistry, Institute of Biology, University of Hohenheim, Stuttgart, Germany
| | - Armin Huber
- Department of Biochemistry, Institute of Biology, University of Hohenheim, Stuttgart, Germany.
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Gao S, Kaudimba KK, Guo S, Zhang S, Liu T, Chen P, Wang R. Transient Receptor Potential Ankyrin Type-1 Channels as a Potential Target for the Treatment of Cardiovascular Diseases. Front Physiol 2020; 11:836. [PMID: 32903613 PMCID: PMC7438729 DOI: 10.3389/fphys.2020.00836] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Accepted: 06/22/2020] [Indexed: 12/15/2022] Open
Abstract
Cardiovascular disease is one of the chronic conditions with the highest mortality rate in the world. Underlying conditions such as hypertension, metabolic disorders, and habits like smoking are contributors to the manifestation of cardiovascular diseases. The treatment of cardiovascular diseases is inseparable from the development of drugs. Consequently, this has led to many researchers to focus on the search for effective drug targets. The transient receptor potential channel Ankyrin 1 (TRPA1) subtype is a non-selective cation channel, which belongs to the transient receptor potential (TRP) ion channel. Previous studies have shown that members of the TRP family contribute significantly to cardiovascular disease. However, many researchers have not explored the role of TRPA1 as a potential target for the treatment of cardiovascular diseases. Furthermore, recent studies revealed that TRPA1 is commonly expressed in the vascular endothelium. The endothelium is linked to the causes of some cardiovascular diseases, such as atherosclerosis, myocardial fibrosis, heart failure, and arrhythmia. The activation of TRPA1 has a positive effect on atherosclerosis, but it has a negative effect on other cardiovascular diseases such as myocardial fibrosis and heart failure. This review introduces the structural and functional characteristics of TRPA1 and its importance on vascular physiology and common cardiovascular diseases. Moreover, this review summarizes some evidence that TRPA1 is correlated to cardiovascular disease risk factors.
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Affiliation(s)
- Song Gao
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
| | | | - Shanshan Guo
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
| | - Shuang Zhang
- School of Kinesiology, Shanghai University of Sport, Shanghai, China.,Institute of Sport Science, Harbin Sport University, Harbin, China
| | - Tiemin Liu
- School of Kinesiology, Shanghai University of Sport, Shanghai, China.,State Key Laboratory of Genetic Engineering, Institute of Metabolism and Integrative Biology, Human Phenome Institute, Department of Endocrinology and Metabolism, and School of Life Sciences, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Peijie Chen
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
| | - Ru Wang
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
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Schopf K, Smylla TK, Huber A. Immunocytochemical Labeling of Rhabdomeric Proteins in Drosophila Photoreceptor Cells Is Compromised by a Light-dependent Technical Artifact. J Histochem Cytochem 2019; 67:745-757. [PMID: 31246149 PMCID: PMC6764007 DOI: 10.1369/0022155419859870] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Drosophila photoreceptor cells are employed as a model system
for studying membrane protein transport. Phototransduction proteins like
rhodopsin and the light-activated TRPL ion channel are transported within the
photoreceptor cell, and they change their subcellular distribution in a
light-dependent way. Investigating the transport mechanisms for rhodopsin and
ion channels requires accurate histochemical methods for protein localization.
By using immunocytochemistry the light-triggered translocation of TRPL has been
described as a two-stage process. In stage 1, TRPL accumulates at the rhabdomere
base and the adjacent stalk membrane a few minutes after onset of illumination
and is internalized in stage 2 by endocytosis after prolonged light exposure.
Here, we show that a commonly observed crescent shaped antibody labeling pattern
suggesting a fast translocation of rhodopsin, TRP, and TRPL to the rhabdomere
base is a light-dependent antibody staining artifact. This artifact is most
probably caused by the profound structural changes in the microvillar membranes
of rhabdomeres that result from activation of the signaling cascade. By using
alternative labeling methods, either eGFP-tags or the self-labeling SNAP-tag, we
show that light activation of TRPL transport indeed results in fast changes of
the TRPL distribution in the rhabdomere but not in the way described
previously.
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Affiliation(s)
- Krystina Schopf
- Department of Biochemistry, Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - Thomas K Smylla
- Department of Biochemistry, Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - Armin Huber
- Department of Biochemistry, Institute of Physiology, University of Hohenheim, Stuttgart, Germany
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Katz B, Voolstra O, Tzadok H, Yasin B, Rhodes-Modrov E, Bartels JP, Strauch L, Huber A, Minke B. The latency of the light response is modulated by the phosphorylation state of Drosophila TRP at a specific site. Channels (Austin) 2017; 11:678-685. [PMID: 28762890 DOI: 10.1080/19336950.2017.1361073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Drosophila photoreceptors respond to oscillating light of high frequency (∼100 Hz), while increasing the oscillating light intensity raises the maximally detected frequency. Recently, we reported that dephosphorylation of the light-activated TRP ion channel at S936 is a fast, graded, light-, and Ca2+-dependent process. We further found that this process affects the detection limit of high frequency oscillating light. Accordingly, transgenic Drosophila, which do not undergo phosphorylation at the S936-TRP site (trpS936A), revealed a short time-interval before following the high stimulus frequency (oscillation-lock response) in both dark- and light-adapted flies. In contrast, the trpS936D transgenic flies, which mimic constant phosphorylation, showed a long-time interval to oscillation-lock response in both dark- and light-adapted flies. Here we extend these findings by showing that dark-adapted trpS936A flies reveal light-induced current (LIC) with short latency relative to trpWT or trpS936D flies, indicating that the channels are a limiting factor of response kinetics. The results indicate that properties of the light-activated channels together with the dynamic light-dependent process of TRP phosphorylation at the S936 site determine response kinetics.
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Affiliation(s)
- Ben Katz
- a Department of Medical Neurobiology , Faculty of Medicine and the Edmond and Lily Safra Center for Brain Sciences (ELSC), Hebrew University , Jerusalem , Israel
| | - Olaf Voolstra
- b Department of Biosensorics , Institute of Physiology, University of Hohenheim , Stuttgart , Germany
| | - Hanan Tzadok
- a Department of Medical Neurobiology , Faculty of Medicine and the Edmond and Lily Safra Center for Brain Sciences (ELSC), Hebrew University , Jerusalem , Israel
| | - Bushra Yasin
- a Department of Medical Neurobiology , Faculty of Medicine and the Edmond and Lily Safra Center for Brain Sciences (ELSC), Hebrew University , Jerusalem , Israel
| | - Elisheva Rhodes-Modrov
- a Department of Medical Neurobiology , Faculty of Medicine and the Edmond and Lily Safra Center for Brain Sciences (ELSC), Hebrew University , Jerusalem , Israel
| | - Jonas-Peter Bartels
- b Department of Biosensorics , Institute of Physiology, University of Hohenheim , Stuttgart , Germany
| | - Lisa Strauch
- b Department of Biosensorics , Institute of Physiology, University of Hohenheim , Stuttgart , Germany
| | - Armin Huber
- b Department of Biosensorics , Institute of Physiology, University of Hohenheim , Stuttgart , Germany
| | - Baruch Minke
- a Department of Medical Neurobiology , Faculty of Medicine and the Edmond and Lily Safra Center for Brain Sciences (ELSC), Hebrew University , Jerusalem , Israel
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The Phosphorylation State of the Drosophila TRP Channel Modulates the Frequency Response to Oscillating Light In Vivo. J Neurosci 2017; 37:4213-4224. [PMID: 28314815 DOI: 10.1523/jneurosci.3670-16.2017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 02/13/2017] [Accepted: 02/28/2017] [Indexed: 11/21/2022] Open
Abstract
Drosophila photoreceptors respond to oscillating light of high frequency (∼100 Hz), while the detected maximal frequency is modulated by the light rearing conditions, thus enabling high sensitivity to light and high temporal resolution. However, the molecular basis for this adaptive process is unclear. Here, we report that dephosphorylation of the light-activated transient receptor potential (TRP) ion channel at S936 is a fast, graded, light-dependent, and Ca2+-dependent process that is partially modulated by the rhodopsin phosphatase retinal degeneration C (RDGC). Electroretinogram measurements of the frequency response to oscillating lights in vivo revealed that dark-reared flies expressing wild-type TRP exhibited a detection limit of oscillating light at relatively low frequencies, which was shifted to higher frequencies upon light adaptation. Strikingly, preventing phosphorylation of the S936-TRP site by alanine substitution in transgenic Drosophila (trpS936A ) abolished the difference in frequency response between dark-adapted and light-adapted flies, resulting in high-frequency response also in dark-adapted flies. In contrast, inserting a phosphomimetic mutation by substituting the S936-TRP site to aspartic acid (trpS936D ) set the frequency response of light-adapted flies to low frequencies typical of dark-adapted flies. Light-adapted rdgC mutant flies showed relatively high S936-TRP phosphorylation levels and light-dark phosphorylation dynamics. These findings suggest that RDGC is one but not the only phosphatase involved in pS936-TRP dephosphorylation. Together, this study indicates that TRP channel dephosphorylation is a regulatory process that affects the detection limit of oscillating light according to the light rearing condition, thus adjusting dynamic processing of visual information under varying light conditions.SIGNIFICANCE STATEMENTDrosophila photoreceptors exhibit high temporal resolution as manifested in frequency response to oscillating light of high frequency (≤∼100 Hz). Light rearing conditions modulate the maximal frequency detected by photoreceptors, thus enabling them to maintain high sensitivity to light and high temporal resolution. However, the precise mechanisms for this process are not fully understood. Here, we show by combination of biochemistry and in vivo electrophysiology that transient receptor potential (TRP) channel dephosphorylation at a specific site is a fast, light-activated and Ca2+-dependent regulatory process. TRP dephosphorylation affects the detection limit of oscillating light according to the adaptation state of the photoreceptor cells by shifting the detection limit to higher frequencies upon light adaptation. This novel mechanism thus adjusts dynamic processing of visual information under varying light conditions.
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Hardie RC, Juusola M. Phototransduction in Drosophila. Curr Opin Neurobiol 2015; 34:37-45. [DOI: 10.1016/j.conb.2015.01.008] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 01/10/2015] [Indexed: 10/24/2022]
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Abstract
STIM1 regulates TRPC6 heteromultimerization with other TRPC channels and internalization to the endoplasmic reticulum, thus reducing Ca2+ entry mediated by TRPC6.
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Abstract
The Drosophila "transient receptor potential" channel is the prototypical TRP channel, belonging to and defining the TRPC subfamily. Together with a second TRPC channel, trp-like (TRPL), TRP mediates the transducer current in the fly's photoreceptors. TRP and TRPL are also implicated in olfaction and Malpighian tubule function. In photoreceptors, TRP and TRPL are localised in the ~30,000 packed microvilli that form the photosensitive "rhabdomere"-a light-guiding rod, housing rhodopsin and the rest of the phototransduction machinery. TRP (but not TRPL) is assembled into multimolecular signalling complexes by a PDZ-domain scaffolding protein (INAD). TRPL (but not TRP) undergoes light-regulated translocation between cell body and rhabdomere. TRP and TRPL are also found in photoreceptor synapses where they may play a role in synaptic transmission. Like other TRPC channels, TRP and TRPL are activated by a G protein-coupled phospholipase C (PLCβ4) cascade. Although still debated, recent evidence indicates the channels can be activated by a combination of PIP2 depletion and protons released by the PLC reaction. PIP2 depletion may act mechanically as membrane area is reduced by cleavage of PIP2's bulky inositol headgroup. TRP, which dominates the light-sensitive current, is Ca(2+) selective (P Ca:P Cs >50:1), whilst TRPL has a modest Ca(2+) permeability (P Ca:P Cs ~5:1). Ca(2+) influx via the channels has profound positive and negative feedback roles, required for the rapid response kinetics, with Ca(2+) rapidly facilitating TRP (but not TRPL) and also inhibiting both channels. In trp mutants, stimulation by light results in rapid depletion of microvillar PIP2 due to lack of Ca(2+) influx required to inhibit PLC. This accounts for the "transient receptor potential" phenotype that gives the family its name and, over a period of days, leads to light-dependent retinal degeneration. Gain-of-function trp mutants with uncontrolled Ca(2+) influx also undergo retinal degeneration due to Ca(2+) cytotoxicity. In vertebrate retina, mice knockout studies suggest that TRPC6 and TRPC7 mediate a PLCβ4-activated transducer current in intrinsically photosensitive retinal ganglion cells, expressing melanopsin. TRPA1 has been implicated as a "photo-sensing" TRP channel in human melanocytes and light-sensitive neurons in the body wall of Drosophila.
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