1
|
Song J, Yu C, Ma F, Lin R, Gao L, Yan Y, Wu Y. Design of molecularly imprinted nanocomposite membrane for selective separation of lysozyme based on double-faced self-assembly strategy. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
2
|
Czapinska H, Winiewska-Szajewska M, Szymaniec-Rutkowska A, Piasecka A, Bochtler M, Poznański J. Halogen Atoms in the Protein-Ligand System. Structural and Thermodynamic Studies of the Binding of Bromobenzotriazoles by the Catalytic Subunit of Human Protein Kinase CK2. J Phys Chem B 2021; 125:2491-2503. [PMID: 33689348 PMCID: PMC8041304 DOI: 10.1021/acs.jpcb.0c10264] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
![]()
Binding of a family
of brominated benzotriazoles to the catalytic
subunit of human protein kinase CK2 (hCK2α) was used as a model
system to assess the contribution of halogen bonding to protein–ligand
interaction. CK2 is a constitutively active pleiotropic serine/threonine
protein kinase that belongs to the CMGC group of eukaryotic protein
kinases (EPKs). Due to the addiction of some cancer cells, CK2 is
an attractive and well-characterized drug target. Halogenated benzotriazoles
act as ATP-competitive inhibitors with unexpectedly good selectivity
for CK2 over other EPKs. We have characterized the interaction of
bromobenzotriazoles with hCK2α by X-ray crystallography, low-volume
differential scanning fluorimetry, and isothermal titration calorimetry.
Properties of free ligands in solution were additionally characterized
by volumetric and RT-HPLC measurements. Thermodynamic data indicate
that the affinity increases with bromo substitution, with greater
contributions from 5- and 6-substituents than 4- and 7-substituents.
Except for 4,7-disubstituted compounds, the bromobenzotriazoles adopt
a canonical pose with the triazole close to lysine 68, which precludes
halogen bonding. More highly substituted benzotriazoles adopt many
additional noncanonical poses, presumably driven by a large hydrophobic
contribution to binding. Some noncanonical ligand orientations allow
the formation of halogen bonds with the hinge region. Consistent with
a predominantly hydrophobic interaction, the isobaric heat capacity
decreases upon ligand binding, the more so the higher the substitution.
Collapse
Affiliation(s)
- Honorata Czapinska
- Institute of Biochemistry and Biophysics PAS, Pawińskiego 5a, 02-106 Warsaw, Poland.,International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland
| | - Maria Winiewska-Szajewska
- Institute of Biochemistry and Biophysics PAS, Pawińskiego 5a, 02-106 Warsaw, Poland.,Department of Biophysics, Institute of Experimental Physics, University of Warsaw, Pasteura 5, 02-089 Warsaw, Poland
| | | | - Anna Piasecka
- Institute of Biochemistry and Biophysics PAS, Pawińskiego 5a, 02-106 Warsaw, Poland.,International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland
| | - Matthias Bochtler
- Institute of Biochemistry and Biophysics PAS, Pawińskiego 5a, 02-106 Warsaw, Poland.,International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland
| | - Jarosław Poznański
- Institute of Biochemistry and Biophysics PAS, Pawińskiego 5a, 02-106 Warsaw, Poland
| |
Collapse
|
3
|
Dahal YR, Schmit JD. Ion Specificity and Nonmonotonic Protein Solubility from Salt Entropy. Biophys J 2019; 114:76-87. [PMID: 29320698 DOI: 10.1016/j.bpj.2017.10.040] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 10/16/2017] [Accepted: 10/26/2017] [Indexed: 10/18/2022] Open
Abstract
The addition of salt to protein solutions can either increase or decrease the protein solubility, and the magnitude of this effect depends on the salt used. We show that these effects can be captured using a theory that includes attractive and repulsive electrostatic interactions, nonelectrostatic protein-ion interactions, and ion-solvent interactions via an effective solvated ion radius. We find that the ion radius has significant effects on the translational entropy of the salt, which leads to salt specificity in the protein solubility. At low salt, the dominant effect comes from the entropic cost of confining ions within the aggregate, whereas at high concentrations, the salt drives a depletion attraction that favors aggregation. Our theory explains the reversal in the Hofmeister series observed in lysozyme cloud point measurements and semi-quantitatively describes the solubility of lysozyme and chymosin crystals. We present a comparison of the contributions to the free energy and give guidelines for when salting in or salting out should be expected.
Collapse
Affiliation(s)
- Yuba Raj Dahal
- Department of Physics, Kansas State University, Manhattan, Kansas
| | - Jeremy D Schmit
- Department of Physics, Kansas State University, Manhattan, Kansas.
| |
Collapse
|
4
|
Bajor M, Zaręba-Kozioł M, Zhukova L, Goryca K, Poznański J, Wysłouch-Cieszyńska A. An Interplay of S-Nitrosylation and Metal Ion Binding for Astrocytic S100B Protein. PLoS One 2016; 11:e0154822. [PMID: 27159591 PMCID: PMC4861259 DOI: 10.1371/journal.pone.0154822] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 04/19/2016] [Indexed: 02/07/2023] Open
Abstract
Mammalian S100B protein plays multiple important roles in cellular brain processes. The protein is a clinically used marker for several pathologies including brain injury, neurodegeneration and cancer. High levels of S100B released by astrocytes in Down syndrome patients are responsible for reduced neurogenesis of neural progenitor cells and induction of cell death in neurons. Despite increasing understanding of S100B biology, there are still many questions concerning the detailed molecular mechanisms that determine specific activities of S100B. Elevated overexpression of S100B protein is often synchronized with increased nitric oxide-related activity. In this work we show S100B is a target of exogenous S-nitrosylation in rat brain protein lysate and identify endogenous S-nitrosylation of S100B in a cellular model of astrocytes. Biochemical studies are presented indicating S-nitrosylation tunes the conformation of S100B and modulates its Ca2+ and Zn2+ binding properties. Our in vitro results suggest that the possibility of endogenous S-nitrosylation should be taken into account in the further studies of in vivo S100B protein activity, especially under conditions of increased NO-related activity.
Collapse
Affiliation(s)
- Małgorzata Bajor
- Department of Biophysics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
- Department of Immunology, Centre for Biostructure Research, Medical University of Warsaw, Warsaw, Poland
| | - Monika Zaręba-Kozioł
- Department of Biophysics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
- Department of Molecular and Cellular Neurobiology, Nencki Institute, Polish Academy of Sciences, Warsaw, Poland
| | - Liliya Zhukova
- Department of Biophysics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Krzysztof Goryca
- Department of Biophysics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Jarosław Poznański
- Department of Biophysics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | | |
Collapse
|
5
|
Bončina M, Lah J, Reščič J, Vlachy V. Thermodynamics of the Lysozyme−Salt Interaction from Calorimetric Titrations. J Phys Chem B 2010; 114:4313-9. [DOI: 10.1021/jp9071845] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matjaž Bončina
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Jurij Lah
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Jurij Reščič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Vojko Vlachy
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| |
Collapse
|
6
|
Elshereef R, Budman H, Moresoli C, Legge RL. Probing protein colloidal behavior in membrane-based separation processes using spectrofluorometric Rayleigh scattering data. Biotechnol Prog 2010; 26:772-80. [DOI: 10.1002/btpr.378] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|