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19 protocols using m365lp1

1

Photochromic Transient Absorption Spectroscopy

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UV LED (λexc = 365 nm, M365LP1, Thorlabs, Newton, New Jersey, USA) was used to perform photochromic reaction in a 1 cm × 1 cm fused silica cuvette placed in a temperature-controlled cuvette holder (Flash 300, Quantum Northwest, Liberty Lake, Washington, USA) with stirring (see Scheme S1). The volume of the solution was about 1.5 mL. Changes in UV-vis absorption spectra over seconds were recorded by a FLAME-T-VIS-NIR-ES USB spectrometer (6 s−1 sampling rate, Ocean Optics, Largo, Florida, USA). White-light of 150 W xenon lamp (Applied Photophysics, Leatherhead, Surrey, United Kingdom) with intensity reduced to a small level was used as a probing beam. 150 ms were used for accumulation of each white-light continuum spectrum. An average of 60 initial spectra before sample UV-irradiation was used to calculate I0(λ) spectrum, the next spectra I(λ) at subsequent times were measured upon or after UV-irradiation to determine the transient absorption spectra accordingly to formula: ΔA(λ)=logI0(λ)I(λ) .
In order to study influence of UV irradiation power on TT formation a V-550 spectrophotometer (Jasco, Hachioji-shi, Tokyo) equipped with the mentioned above temperature-controlled cuvette holder, stirring and UV LED source was used.
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2

Photoconjugation of PpL Mutants and Antibodies

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In initial screens, PpL mutants and anti-CD3 (clone UTH1, BD bioscience 555329) antibodies were diluted into PBS pH7.6 such that the final concentrations were approximately 50 µM and 2 µM, respectively, and loaded into thin walled 200 µL polypropylene microtubes (PCR tubes). This mixture was then irradiated for 1 h under 365 nm light at an intensity of 6.4 mW/cm2 from an LED source (M365LP1, Thor Labs) 14 cm away. Products were reduced using DTT solution (ThermoFisher) and separated on 4–12% BisTris PAGE gels (ThermoFisher) to observe photoconjugation. Full gel images are shown in Supplementary Fig. S2. Photocleavage was accomplished using the same irradiation setup. Photoconjugations to anti-FLAG antibody (anti-DYDDDDK clone 1557CT661.18.1, Lifespan Biosience LS‑C392574) or Cetuximab (Selleck Chemicals A2000) were done identically, with 100 µM PpL constructs that had been freshly purified. Photoconjugates were then purified from excess PpL using Amicon Ultra 50 kDa MWCO spin filter columns (Millipore-Sigma, UCFC505008). The unaltered antibody control conditions of our ELISA experiments, described below, validated Anti-FLAG binding to the FLAG peptide and Cetuximab binding to EGFR protein.
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3

Simultaneous UV-vis and IR Spectroscopy

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Changes in UV–vis absorption spectra and kinetics were recorded using three configurations.

Jasco V-550 spectrophotometer with a modified cell compartment. The solution in 1 cm × 1 cm fused silica cuvette was placed into a temperature-controlled cuvette holder (Flash 300, Quantum Northwest) with stirring switched on. UV LED (λexc = 365 nm, Thorlabs M365LP1) was used to induce the photochromic reaction (as in the two other configurations below).

Similar arrangement with a temperature-controlled cuvette holder and white light generated by a xenon lamp (Applied Photophysics), equipped with a bundle fiber, as a probing beam. The probing beam was passed through an almost-closed iris to ensure low white light intensity. The UV–vis spectra were recorded by an Ocean Optics FLAME-T-VIS–NIR-ES USB spectrometer at the sampling rate of 10 spectra per second.

Acquisition mid-IR spectra upon simultaneous measurements in UV–vis spectral range has been described recently11 (link). A Bruker Tensor 27 FT-IR spectrometer was equipped with an MCT detector, with a spectral resolution of 4 cm−1 and a sampling rate of 1.15 s−1. The UV–vis probing light was generated from the xenon lamp. An Ocean Optics spectrophotometer was used for recording of UV–vis spectra. A Harrick Scientific cell was used with 2 mm thick CaF2 window and a 0.63 mm spacer.

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4

Mouse Model of UV-Induced FECD

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The nongenetic FECD mouse model was obtained as previously described.22 (link) Briefly, A UVA light-emitting diode (LED) light source (M365LP1, Thorlabs, USA) was focused to illuminate a 4-mm-diameter spot onto the mouse cornea. The energy was measured using a laser sensor (model L49 150A, Ophir, Israel), and the time of UVA exposure was adjusted to deliver the appropriate fluency (20 min 57 s for 500 J/cm2, 31 min 26 s for 750 J/cm2, 41 min 54 s for 1,000 J/cm2). The treated eye was irradiated, while the other untreated eye served as control.
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5

Antibody Photoconjugation with Gx-d2 Sensors

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Gx-d2-SB and Gx-d2-LB were photoconjugated
to infliximab (obtained via the Máxima Medisch Centrum pharmacy
in Veldhoven, The Netherlands) and anti-IL-6 (10395-mhK23 and 10395-R508,
ordered from SinoBiological). Photoconjugation was performed with
1 μM antibody and 2 μM Gx-d2-SB or Gx-d2-LB in PBS (pH
7.4) for 15 min, by using a Thorlabs M365LP1 (λ = 365 nm) UV-lamp
coupled with a Thorlabs LEDD1B T-Cube LED Driver (continuous wave,
current limit 1.2A, 80% intensity), as shown in Figure S5. After conjugation, the crosslinked sensor components
were not further purified and stored at 4 °C until use.
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6

Photolysis of Caged-Serotonin using UV LED

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We used a high-power UV LED (M365LP1, 365 nm wavelength, Thorlabs) to elicit photolysis of caged-serotonin. The light was presented at 0.2 mW with a 20 ms pulse. The external saline containing caged-serotonin was recirculated at the beginning of experiments, and we replaced it every experiment. To prevent undesirable photolysis, we shielded the preparation from ambient light.
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7

Photolysis of CNI-Gly and MNI-Glu

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UV-Vis absorption spectra were recorded using a Cary 50 spectrophotometer (Agilent). Photolysis used a 365 nm LED (M365LP1, Thorlabs, Sparta, NJ, USA) in HEPES buffer (40 mM, 100 mM KCl, pH 7.4) in a quartz cuvette (1 cm pathlength). Solutions of CNI-Gly and MNI-Glu having matching absorptions at 365 nm (concentrations ca. 0.05 mM) were irradiated over a period of 6 min. Changes in the absorption spectra of CNI-Gly and MNI-Glu were taken every 60 s.
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8

Steady-State Optical Characterization of Thin Films

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Steady-state absorption spectra of the thin films were measured using a Varian Cary 5000 spectrophotometer (slit width 0.5 nm). CD spectra were recorded on the same instrument using a home-built add-on employing polariser—achromatic quarter-wave plate combinations (Thorlabs WP25M-UB and AQWP05M-340 for the wavelength range 260−410 nm, Thorlabs LPVISE100-A and AQWP05M-580 for the spectral region 400−700 nm). The CD spectrum was then obtained by taking the difference of two measurements, with the fast axis of the quarter-wave plate adjusted to either +45° or −45° with respect to the axis of the polariser. Steady-state PL and CPL spectra of the complete thin film samples were obtained as follows: The thin film was illuminated by light from a filtered (Schott UG 1, 3 mm) continuous-wave UV LED (Thorlabs M365LP1, 365 nm, FWHM 10 nm). Fluorescence emitted at right angle passed through a zero-order achromatic broadband quarter-wave plate and a broadband polariser (same combination as for the steady-state CD experiments) and was then focused into a fibre-optic cable connected to a spectrograph with a back-illuminated thermoelectrically cooled CCD detector (Avantes AvaSpec-Hero). CPL spectra were obtained by subtracting the emission spectra of two consecutive measurements with the polariser axis set at either 0° or 90° and the fast axis of the quarter-wave plate fixed at 45°.
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9

Cortisol and proBNP Antibody Photoconjugation

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Monoclonal mouse IgG2a cortisol antibody
ab1949 (XM210) was obtained from Abcam, and monoclonal mouse IgG2a
proBNP antibody NB120–14712 (13G12cc) was purchased from Novus
Biologicals. The LUCOS sensor components (1 μM) and antibody
(1 μM) were mixed in PBS (pH 7.4) in a final volume of 20 μL
and preincubated for 30 min at room temperature. Photoconjugation
reactions were subsequently performed using a UV lamp (Thorlabs M365LP1
with a Thorlabs LEDD1B T-Cube LED Driver) for 15 min.6 (link) After conjugation, the LUCOS sensors were not further purified
and stored at 4 °C until use.
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10

Photolytic Release of cGMP

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Caged cGMP was photolyzed using a 365‐nm LED (M365LP1, Thorlabs). The LED was coupled to a liquid light guide and delivered to the cuvette (FC‐15 Bio‐Logic). The fluorescence background resulting from the 365‐nm LED was removed using lock‐in detection. The waveform, timing, and triggering of the photolysis light were controlled through the interface of a self‐made LabVIEW program using a DAQ card (NIUSB‐625; National Instruments). The photolytic release of cGMP was calibrated via the increase in fluorescence upon photolysis (Hamzeh et al, 2019).
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