1
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Effect of hemoglobin hydration on the physical properties of erythrocyte cytoplasm and whole blood. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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2
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Conclusions About Osmotically Inactive Volume and Osmotic Fragility from a Detailed Erythrocyte Model. J Theor Biol 2022; 539:110982. [DOI: 10.1016/j.jtbi.2021.110982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 12/04/2021] [Accepted: 12/07/2021] [Indexed: 11/20/2022]
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3
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Yavorska O, Syriste L, du Plessis CM, Yaqoob M, Loogman K, Cordara M, Chik JK. Cosolutes Modify Alkaline Phosphatase Catalysis through Osmotic Stress and Crowding Mechanisms. ACS OMEGA 2021; 6:26239-26250. [PMID: 34660983 PMCID: PMC8515568 DOI: 10.1021/acsomega.1c03243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 09/16/2021] [Indexed: 05/15/2023]
Abstract
Examining the effects of different cosolutes on in vitro enzyme kinetics yielded glimpses into their potential behavior when functioning in their natural, complex, in vivo milieu. Viewing cosolute in vitro influences on a model enzyme, calf intestinal alkaline phosphatase, as a combination of competitive and uncompetitive behaviors provided quantitative insights into their effects on catalysis. Observed decreases in the apparent specificity constant, K asp, caused by the presence of polyethylene glycols or betaine in the reaction solution, indicated interference with enzyme-substrate complex formation. This competitive inhibition appeared to be driven by osmotic stress. Dextran 6 K and sucrose strongly impeded the subsequent conversion of the bound substrate into a free product, which was marked by sharp reductions in V max, uncompetitive inhibition. For the same step, smaller noncarbohydrate cosolutes, triethylene glycol, polyethylene glycol 400, and betaine, also behaved as uncompetitive inhibitors but to a lesser extent. However, polyethylene glycol 8000 and 20,000 were uncompetitive activators, increasing V max. Polyethylene glycol of molecular weight 1000 displayed intermediate effects between these two groups of noncarbohydrate cosolutes. These results suggested that crowding has a strong influence on free product formation. The combination of competitive and uncompetitive effects and mixed behaviors, caused by the cosolutes on calf intestinal alkaline phosphatase kinetics, was consistent with the trends seen in similar enzyme-cosolute studies. It is proposed that the double-displacement mechanism of alkaline phosphatases, shared by many other enzymes, could be the root of this general observation.
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Affiliation(s)
- Oksana
A. Yavorska
- Department
of Chemistry and Physics, Mount Royal University, Calgary, Alberta T2N4N1, Canada
| | - Lukas Syriste
- Microbiology,
Immunology & Infectious Diseases, Cumming School of Medicine, University of Calgary, HSC B724-E, 3330 Hospital Drive NW, Calgary, Alberta T3E 6K6, Canada
| | - Chantal M. du Plessis
- Department
of Chemistry and Physics, Mount Royal University, Calgary, Alberta T2N4N1, Canada
| | - Maryam Yaqoob
- Department
of Chemistry and Physics, Mount Royal University, Calgary, Alberta T2N4N1, Canada
| | - Kyle Loogman
- Department
of Chemistry and Physics, Mount Royal University, Calgary, Alberta T2N4N1, Canada
| | - Michael Cordara
- Department
of Chemistry and Physics, Mount Royal University, Calgary, Alberta T2N4N1, Canada
| | - John K. Chik
- Department
of Chemistry and Physics, Mount Royal University, Calgary, Alberta T2N4N1, Canada
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4
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Webster KD, Dahhan D, Otto AM, Frosti CL, Dean WL, Chaires JB, Olsen KW. "Inside-Out" PEGylation of Bovine β-Cross-Linked Hemoglobin. Artif Organs 2017; 41:351-358. [PMID: 28321886 DOI: 10.1111/aor.12928] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 01/12/2017] [Accepted: 01/13/2017] [Indexed: 01/06/2023]
Abstract
The development of a blood substitute is urgent due to blood shortages and potential communicable diseases. A novel method, inside-out PEGylation, has been used here to conjugate a multiarm maleimide-PEG (Mal-PEG) to β-cross-linked (βXL-Hb) hemoglobin (Hb) tetramers through the Cys β93 residues. This method produces a polymer with a single PEG backbone that is surrounded by multiple proteins, rather than coating a single protein with multiple PEG chains. Electrophoresis under denaturing conditions showed a large molecular weight species. Gel filtration chromatography and analytical ultracentrifugation determined the most prevalent species had three βXL-Hb to one Mal-PEG. Thermal denaturation studies showed that the cross-linked and PEGylated species were more stable than native Hb. Cross-linking under oxy-conditions produced a high oxygen affinity Hb species (P50 = 9.18 Torr), but the oxygen affinity was not significantly altered by PEGylation (P50 = 9.67 Torr). Inside-out PEGylation can be used to produce a hemoglobin-based oxygen carrier and potentially for other multiprotein complexes.
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Affiliation(s)
- Kyle D Webster
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL
| | - Dana Dahhan
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL
| | - Abigail M Otto
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL
| | - Cheyanne L Frosti
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL
| | | | - Jonathan B Chaires
- James Graham Brown Cancer Center.,Department of Medicine, University of Louisville, Louisville, KY, USA
| | - Kenneth W Olsen
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL
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5
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Iritani E, Katagiri N, Nakajima R, Hwang KJ, Cheng TW. Nanocolloid cake properties determined from step-up pressure filtration with single-stage reduction in filtration area. AIChE J 2015. [DOI: 10.1002/aic.14967] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Eiji Iritani
- Dept. of Chemical Engineering; Nagoya University; Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Nobuyuki Katagiri
- Dept. of Chemical Engineering; Nagoya University; Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Ryota Nakajima
- Dept. of Chemical Engineering; Nagoya University; Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Kuo-Jen Hwang
- Dept. of Chemical and Materials Engineering; Tamkang University; Tamsui New Taipei City 25137 Taiwan
| | - Tung-Wen Cheng
- Dept. of Chemical and Materials Engineering; Tamkang University; Tamsui New Taipei City 25137 Taiwan
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6
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Picosecond dynamics in haemoglobin from different species: A quasielastic neutron scattering study. Biochim Biophys Acta Gen Subj 2014; 1840:2989-99. [DOI: 10.1016/j.bbagen.2014.06.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 06/10/2014] [Accepted: 06/11/2014] [Indexed: 11/22/2022]
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7
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Kaieda S, Lund M, Plivelic TS, Halle B. Weak self-interactions of globular proteins studied by small-angle X-ray scattering and structure-based modeling. J Phys Chem B 2014; 118:10111-9. [PMID: 25117055 DOI: 10.1021/jp505809v] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We investigate protein-protein interactions in solution by small-angle X-ray scattering (SAXS) and theoretical modeling. The structure factor for solutions of bovine pancreatic trypsin inhibitor (BPTI), myoglobin (Mb), and intestinal fatty acid-binding protein (IFABP) is determined from SAXS measurements at multiple concentrations, from Monte Carlo simulations with a coarse-grained structure-based interaction model, and from analytic approximate solutions of two idealized colloidal interaction models without adjustable parameters. By combining these approaches, we find that the structure factor is essentially determined by hard-core and screened electrostatic interactions. Other soft short-ranged interactions (van der Waals and solvation-related) are either individually insignificant or tend to cancel out. The structure factor is also not significantly affected by charge fluctuations. For Mb and IFABP, with a small net charge and relatively symmetric charge distribution, the structure factor is well described by a hard-sphere model. For BPTI, with a larger net charge, screened electrostatic repulsion is also important, but the asymmetry of the charge distribution reduces the repulsion from that predicted by a charged hard-sphere model with the same net charge. Such charge asymmetry may also amplify the effect of shape asymmetry on the protein-protein potential of mean force.
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Affiliation(s)
- Shuji Kaieda
- Department of Biophysical Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden
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8
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Kang Y, Si M, Zhu Y, Miao L, Xu G. Surface-enhanced Raman scattering (SERS) spectra of hemoglobin of mouse and rabbit with self-assembled nano-silver film. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 108:177-180. [PMID: 23474476 DOI: 10.1016/j.saa.2013.01.098] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 01/14/2013] [Accepted: 01/27/2013] [Indexed: 06/01/2023]
Abstract
The nano-silver film was prepared by electrolysis method. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were employed to detect the morphology of the nano-silver particles. The SERS spectra of the hemoglobin (rabbit and mouse) on nano-silver film were gained. It could be known from the SERS spectra that the nano-silver films could enhance the Raman signal of the hemoglobin efficiently, and the sodium citrate and PBS create no influence to the SERS spectra of the hemoglobin. Using this electrolysis technique to fabricate highly bio-active, stable, reusable, and low-cost SERS substrate will be useful in the development of hemoglobin detection.
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Affiliation(s)
- Yipu Kang
- Key Laboratory for Renewable Energy and Gas Hydrates, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China
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Induced fit on heme binding to the Pseudomonas aeruginosa cytoplasmic protein (PhuS) drives interaction with heme oxygenase (HemO). Proc Natl Acad Sci U S A 2012; 109:5639-44. [PMID: 22451925 DOI: 10.1073/pnas.1121549109] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Iron, an essential nutrient with limited bioavailability, requires specialized cellular mechanisms for uptake. Although iron uptake into the cytoplasm in the form of heme has been well characterized in many bacteria, the subsequent trafficking is poorly understood. The cytoplasmic heme-binding proteins belong to a structurally related family thought to have evolved as "induced fit" ligand-binding macromolecules. One member, Pseudomonas aeruginosa cytoplasmic protein (PhuS), has previously been shown to be important for delivering heme to the iron regulated heme oxygenase (HemO). Spectroscopic investigations of the holo-PhuS complex revealed a dynamic heme environment with overlapping but distinct heme-binding sites with alternative coordinating heme ligands, His-209 or His-212. In the present work we establish a mechanism for how heme is transferred from PhuS to its partner, HemO. Using surface plasmon resonance and isothermal titration calorimetry, we have discovered that holo-PhuS, but not apo-PhuS, forms a 1:1 complex with HemO. Sedimentation velocity and limited proteolysis experiments suggest that heme binding to PhuS induces a conformational rearrangement that drives the protein interaction with HemO. Hydrodynamic analysis reveals that the holo-PhuS displays a more expanded hydrodynamic envelope compared with apo-PhuS, and we propose that this conformational change drives the interaction with HemO. We further demonstrate that replacement of His-212 by Ala disrupts the interaction of holo-PhuS with HemO; in contrast, the His-209-Ala variant can still complex with HemO, albeit more weakly. Together, the present studies reveal a mechanism that couples a heme-dependent conformational switch in PhuS to protein-protein interaction, the subsequent free energy of which drives heme release to HemO.
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10
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Straseski JA, Lyon ME, Clarke W, Dubois JA, Phelan LA, Lyon AW. Investigating interferences of a whole-blood point-of-care creatinine analyzer: comparison to plasma enzymatic and definitive creatinine methods in an acute-care setting. Clin Chem 2011; 57:1566-73. [PMID: 21920914 DOI: 10.1373/clinchem.2011.165480] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Although measurement of whole-blood creatinine at the point of care offers rapid assessment of renal function, agreement of point-of-care (POC) results with central laboratory methods continues to be a concern. We assessed the influence of several potential interferents on POC whole-blood creatinine measurements. METHODS We compared POC creatinine (Nova StatSensor) measurements with plasma enzymatic (Roche Modular) and isotope dilution mass spectrometry (IDMS) assays in 119 hospital inpatients. We assessed assay interference by hematocrit, pH, pO(2), total and direct bilirubin, creatine, prescribed drugs, diagnosis, red blood cell water fraction, and plasma water fraction. RESULTS CVs for POC creatinine were 1.5- to 6-fold greater than those for plasma methods, in part due to meter-to-meter variation. Regressioncomparison of POC creatinine to IDMS results gave a standard error (S(y|x)) of 0.61 mg/dL (54 μmol/L), whereas regression of plasma enzymatic creatinine to IDMS was S(y|x) 0.16 mg/dL (14 μmol/L). By univariate analysis, bilirubin, creatine, drugs, pO(2), pH,plasma water fraction, and hematocrit were not found to contribute to method differences. However, multivariate analysis revealed that IDMS creatinine, red blood cell and plasma water fractions, and hematocrit explained 91.8% of variance in POC creatinine results. CONCLUSIONS These data suggest that whole-blood POC creatinine measurements should be used with caution. Negative interferences observed with these measurements could erroneously suggest adequate renal function near the decision threshold, particularly if estimated glomerular filtration rate is determined. Disparity between whole-blood and plasma matrices partially explains the discordance between whole-blood and plasma creatinine methods.
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Affiliation(s)
- Joely A Straseski
- University of Utah Health Sciences Center, Department of Pathology, Salt Lake City, USA.
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11
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Arisaka F, Nagai Y, Nagai M. Dimer–tetramer association equilibria of human adult hemoglobin and its mutants as observed by analytical ultracentrifugation. Methods 2011; 54:175-80. [DOI: 10.1016/j.ymeth.2011.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 01/10/2011] [Accepted: 01/13/2011] [Indexed: 10/18/2022] Open
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12
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Rana MS, Riggs AF. Indefinite noncooperative self-association of chicken deoxy hemoglobin D. Proteins 2011; 79:1499-512. [PMID: 21337627 DOI: 10.1002/prot.22978] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2010] [Revised: 12/04/2010] [Accepted: 12/21/2010] [Indexed: 11/09/2022]
Abstract
The minor tetrameric hemoglobin (Hb), Hb D, of chicken red blood cells self-associates upon deoxygenation. This self-association enhances the cooperativity of oxygen binding. The maximal Hill coefficient is greater than 4 at high Hb concentrations. Previous measurements at low Hb concentrations were consistent with a monomer-to-dimer equilibrium and an association constant of ∼1.3-1.6 × 10(4) M(-1). Here, the Hb tetramer is considered as the monomer. However, new results indicate that the association extends beyond the dimer. We show by combination of Hb oligomer modeling and sedimentation velocity analyses that the data can be well described by an indefinite noncooperative or isodesmic association model. In this model, the deoxy Hb D associates noncooperatively to give a linear oligomeric chain with an equilibrium association constant of 1.42 × 10(4) M(-1) at 20°C for each step. The data are also well described by a monomer-dimer-tetramer equilibrium model with monomer-to-dimer and dimer-to-tetramer association constants of 1.87 and 1.03 × 10(4) M(-1) at 20°C, respectively. A hybrid recombinant Hb D was prepared with recombinant α(D)-globin and native β-globin to give a Hb D tetramer (α(2)(D)β(2)). This rHb D undergoes decreased deoxygenation-dependent self-association compared with the native Hb D. Residue glutamate 138 has previously been proposed to influence intertetramer interactions. Our results with recombinant Hb D show that Glu138 plays no role in deoxy Hb D intertetramer interactions.
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Affiliation(s)
- Mitra S Rana
- Section of Neurobiology, School of Biological Sciences, University of Texas, Austin, Texas 78712-0252, USA
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13
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Lyon ME, Lyon AW. Patient acuity exacerbates discrepancy between whole blood and plasma methods through error in molality to molarity conversion: "Mind the gap!". Clin Biochem 2011; 44:412-7. [PMID: 21255564 DOI: 10.1016/j.clinbiochem.2011.01.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 11/12/2010] [Accepted: 01/08/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVE A mathematical constant factor is proposed to convert measured whole blood glucose molality to plasma-equivalent molarity. The objective of this study was to determine the distributions of conversion factors for groups of patients with different acuity and to assess the gap or error in plasma-equivalent glucose reporting that would occur when a mathematical constant conversion factor is used in patients. METHODS Distributions of hematocrit, red blood cell water and plasma water were determined in patients from the community, hospital and adult intensive care unit. Volume displacement conversion factor distributions and glucose error were determined for each group. RESULTS With increasing patient acuity the median hematocrit decreased, median plasma water increased and variation of these parameters increased. In hospital patients, the molality to molarity conversion factor distribution interval was 1.04-1.16, rather than a constant 1.11. Assuming direct electrode glucose devices only have error attributed to analytical imprecision (coefficient of variation of 5%), it is predicted that only 2% of community patients will have glucose results that exceed 10% of the target values. In the same device, due to variance in hematocrit and plasma water affecting the factor for conversion of molality to molarity, it is predicted that 8.2% of adult intensive care unit patients would have glucose results that exceed 10% of the target value. CONCLUSIONS Changes in hematocrit and plasma water concentration are predicted to affect a gap or error between whole blood direct reading biosensors and central laboratory plasma methods. This error increases and becomes more variable as patient acuity increases.
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Affiliation(s)
- Martha E Lyon
- Department of Pathology and Laboratory Medicine, Calgary, Alberta, Canada.
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14
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Stadler AM, van Eijck L, Demmel F, Artmann G. Macromolecular dynamics in red blood cells investigated using neutron spectroscopy. J R Soc Interface 2010; 8:590-600. [PMID: 20739313 DOI: 10.1098/rsif.2010.0306] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We present neutron scattering measurements on the dynamics of haemoglobin (Hb) in human red blood cells (RBCs) in vivo. Global and internal Hb dynamics were measured in the ps to ns time and Å length scales using quasi-elastic neutron backscattering spectroscopy. We observed the cross over from global Hb short-time to long-time self-diffusion. Both short- and long-time diffusion coefficients agree quantitatively with predicted values from the hydrodynamic theory of non-charged hard-sphere suspensions when a bound water fraction of around 0.23 gram H(2)O per gram Hb is taken into account. The higher amount of water in the cells facilitates internal protein fluctuations in the ps time scale when compared with fully hydrated Hb powder. Slower internal dynamics of Hb in RBCs in the ns time range were found to be rather similar to results obtained with fully hydrated protein powders, solutions and Escherichia coli cells.
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15
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Liu R, Si M, Kang Y, Zi X, Liu Z, Zhang D. A simple method for preparation of Ag nanofilm used as active, stable, and biocompatible SERS substrate by using electrostatic self-assembly. J Colloid Interface Sci 2010; 343:52-7. [DOI: 10.1016/j.jcis.2009.11.042] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2009] [Revised: 10/31/2009] [Accepted: 11/18/2009] [Indexed: 10/20/2022]
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16
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Raman study of mechanically induced oxygenation state transition of red blood cells using optical tweezers. Biophys J 2010; 96:209-16. [PMID: 18931252 DOI: 10.1529/biophysj.108.139097] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Accepted: 09/08/2008] [Indexed: 11/18/2022] Open
Abstract
Raman spectroscopy was used to monitor changes in the oxygenation state of human red blood cells while they were placed under mechanical stress with the use of optical tweezers. The applied force is intended to simulate the stretching and compression that cells experience as they pass through vessels and smaller capillaries. In this work, spectroscopic evidence of a transition between the oxygenation and deoxygenation states, which is induced by stretching the cell with optical tweezers, is presented. The transition is due to enhanced hemoglobin-membrane and hemoglobin neighbor-neighbor interactions, and the latter was further studied by modeling the electrostatic binding of two of the protein structures.
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Rana MS, Knapp JE, Holland RAB, Riggs AF. Component D of chicken hemoglobin and the hemoglobin of the embryonic Tammar wallaby (Macropus eugenii) self-associate upon deoxygenation: Effect on oxygen binding. Proteins 2007; 70:553-61. [DOI: 10.1002/prot.21793] [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]
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