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Blacker TS, Duchen MR, Bain AJ. NAD(P)H binding configurations revealed by time-resolved fluorescence and two-photon absorption. Biophys J 2023; 122:1240-1253. [PMID: 36793214 PMCID: PMC10111271 DOI: 10.1016/j.bpj.2023.02.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 09/07/2022] [Accepted: 02/10/2023] [Indexed: 02/16/2023] Open
Abstract
NADH and NADPH play key roles in the regulation of metabolism. Their endogenous fluorescence is sensitive to enzyme binding, allowing changes in cellular metabolic state to be determined using fluorescence lifetime imaging microscopy (FLIM). However, to fully uncover the underlying biochemistry, the relationships between their fluorescence and binding dynamics require greater understanding. Here we accomplish this through time- and polarization-resolved fluorescence and polarized two-photon absorption measurements. Two lifetimes result from binding of both NADH to lactate dehydrogenase and NADPH to isocitrate dehydrogenase. The composite fluorescence anisotropy indicates the shorter (1.3-1.6 ns) decay component to be accompanied by local motion of the nicotinamide ring, pointing to attachment solely via the adenine moiety. For the longer lifetime (3.2-4.4 ns), the nicotinamide conformational freedom is found to be fully restricted. As full and partial nicotinamide binding are recognized steps in dehydrogenase catalysis, our results unify photophysical, structural, and functional aspects of NADH and NADPH binding and clarify the biochemical processes that underlie their contrasting intracellular lifetimes.
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Affiliation(s)
- Thomas S Blacker
- Department of Physics & Astronomy, University College London, London, United Kingdom; Research Department of Cell & Developmental Biology, University College London, London, United Kingdom
| | - Michael R Duchen
- Research Department of Cell & Developmental Biology, University College London, London, United Kingdom
| | - Angus J Bain
- Department of Physics & Astronomy, University College London, London, United Kingdom.
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2
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Masters TA, Marsh RJ, Blacker TS, Armoogum DA, Larijani B, Bain AJ. Polarized two-photon photoselection in EGFP: Theory and experiment. J Chem Phys 2018; 148:134311. [PMID: 29626864 DOI: 10.1063/1.5011642] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In this work, we present a complete theoretical description of the excited state order created by two-photon photoselection from an isotropic ground state; this encompasses both the conventionally measured quadrupolar (K = 2) and the "hidden" degree of hexadecapolar (K = 4) transition dipole alignment, their dependence on the two-photon transition tensor and emission transition dipole moment orientation. Linearly and circularly polarized two-photon absorption (TPA) and time-resolved single- and two-photon fluorescence anisotropy measurements are used to determine the structure of the transition tensor in the deprotonated form of enhanced green fluorescent protein. For excitation wavelengths between 800 nm and 900 nm, TPA is best described by a single element, almost completely diagonal, two-dimensional (planar) transition tensor whose principal axis is collinear to that of the single-photon S0 → S1 transition moment. These observations are in accordance with assignments of the near-infrared two-photon absorption band in fluorescent proteins to a vibronically enhanced S0 → S1 transition.
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Affiliation(s)
- T A Masters
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - R J Marsh
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - T S Blacker
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - D A Armoogum
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - B Larijani
- Cell Biophysics Laboratory, Ikerbasque, Basque Foundation for Science and Unidad de Biofisica (CSIC-UPV/EHU), Bilbao, Spain
| | - A J Bain
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
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3
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Paul BK, Ghosh N, Mondal R, Mukherjee S. Contrasting Effects of Salt and Temperature on Niosome-Bound Norharmane: Direct Evidence for Positive Heat Capacity Change in the Niosome:β-Cyclodextrin Interaction. J Phys Chem B 2016; 120:4091-101. [DOI: 10.1021/acs.jpcb.6b02168] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Bijan K. Paul
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Narayani Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Ramakanta Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhauri, Bhopal 462066, Madhya Pradesh India
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4
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Qureshi T, Peterson CB. Single fluorescence probes along the reactive center loop reveal site-specific changes during the latency transition of PAI-1. Protein Sci 2015; 25:487-98. [PMID: 26540464 DOI: 10.1002/pro.2839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 10/24/2015] [Accepted: 11/03/2015] [Indexed: 11/09/2022]
Abstract
The serine protease inhibitor (serpin), plasminogen activator inhibitor-1 (PAI-1), is an important biomarker for cardiovascular disease and many cancers. It is therefore a desirable target for pharmaceutical intervention. However, to date, no PAI-1 inhibitor has successfully reached clinical trial, indicating the necessity to learn more about the mechanics of the serpin. Although its kinetics of inhibition have been extensively studied, less is known about the latency transition of PAI-1, in which the solvent-exposed reactive center loop (RCL) inserts into its central β-sheet, rendering the inhibitor inactive. This spontaneous transition is concomitant with a large translocation of the RCL, but no change in covalent structure. Here, we conjugated the fluorescent probe, NBD, to single positions along the RCL (P13-P5') to detect changes in solvent exposure that occur during the latency transition. The results support a mousetrap-like RCL-insertion that occurs with a half-life of 1-2 h in accordance with previous reports. Importantly, this study exposes unique transitions during latency that occur with a half-life of ∼5 and 25 min at the P5' and P8 RCL positions, respectively. We hypothesize that the process detected at P5' represents s1C detachment, while that at P8 results from a steric barrier to RCL insertion. Together, these findings provide new insights by characterizing multiple steps in the latency transition.
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Affiliation(s)
- Tihami Qureshi
- Department of Biochemistry, Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee, 37996
| | - Cynthia B Peterson
- Department of Biochemistry, Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee, 37996
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5
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Smith TA, Ghiggino KP. A review of the analysis of complex time-resolved fluorescence anisotropy data. Methods Appl Fluoresc 2015; 3:022001. [DOI: 10.1088/2050-6120/3/2/022001] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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Masters TA, Marsh RJ, Armoogum DA, Nicolaou N, Larijani B, Bain AJ. Restricted State Selection in Fluorescent Protein Förster Resonance Energy Transfer. J Am Chem Soc 2013; 135:7883-90. [DOI: 10.1021/ja312230b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas A. Masters
- Department
of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT,
United Kingdom
- Cell Biophysics
Laboratory,
Cancer Research U.K., Lincoln’s Inn Fields Laboratories, London Research Institute, London WC2A 3LY,
United Kingdom
| | - Richard J. Marsh
- Department
of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT,
United Kingdom
| | - Daven A. Armoogum
- Department
of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT,
United Kingdom
| | - Nick Nicolaou
- Department
of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT,
United Kingdom
| | - Banafshé Larijani
- Cell Biophysics
Laboratory,
Cancer Research U.K., Lincoln’s Inn Fields Laboratories, London Research Institute, London WC2A 3LY,
United Kingdom
| | - Angus J. Bain
- Department
of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT,
United Kingdom
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Paul BK, Guchhait N. Differential interactions of a biological photosensitizer with liposome membranes having varying surface charges. Photochem Photobiol Sci 2012; 11:661-73. [DOI: 10.1039/c2pp05346b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Paul BK, Guchhait N. Modulated Photophysics of an ESIPT Probe 1-Hydroxy-2-naphthaldehyde within Motionally Restricted Environments of Liposome Membranes Having Varying Surface Charges. J Phys Chem B 2010; 114:12528-40. [DOI: 10.1021/jp1048138] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Bijan Kumar Paul
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009, India
| | - Nikhil Guchhait
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Calcutta-700009, India
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