Top-down high-resolution mass spectrometry of cardiac myosin binding protein C revealed that truncation alters protein phosphorylation state.

PubWeight™: 2.10‹?› | Rank: Top 2%

🔗 View Article (PMC 2722289)

Published in Proc Natl Acad Sci U S A on June 16, 2009

Authors

Ying Ge1, Inna N Rybakova, Qingge Xu, Richard L Moss

Author Affiliations

1: Human Proteomics Program and Department of Physiology, School of Medicine and Public Health, University of Wisconsin-Madison, 1300 University Avenue, Madison, WI 53706, USA. yge@physiology.wisc.edu

Articles citing this

Mapping intact protein isoforms in discovery mode using top-down proteomics. Nature (2011) 4.84

Top-down quantitative proteomics identified phosphorylation of cardiac troponin I as a candidate biomarker for chronic heart failure. J Proteome Res (2011) 2.17

Top-down mass spectrometry: recent developments, applications and perspectives. Analyst (2011) 1.50

In vivo phosphorylation site mapping in mouse cardiac troponin I by high resolution top-down electron capture dissociation mass spectrometry: Ser22/23 are the only sites basally phosphorylated. Biochemistry (2009) 1.41

Augmented phosphorylation of cardiac troponin I in hypertensive heart failure. J Biol Chem (2011) 1.38

Comprehensive analysis of protein modifications by top-down mass spectrometry. Circ Cardiovasc Genet (2011) 1.34

Post-translational modifications of integral membrane proteins resolved by top-down Fourier transform mass spectrometry with collisionally activated dissociation. Mol Cell Proteomics (2010) 1.28

Identification of novel protein kinase A phosphorylation sites in the M-domain of human and murine cardiac myosin binding protein-C using mass spectrometry analysis. J Proteome Res (2010) 1.28

Myosin binding protein C interaction with actin: characterization and mapping of the binding site. J Biol Chem (2010) 1.27

Deciphering modifications in swine cardiac troponin I by top-down high-resolution tandem mass spectrometry. J Am Soc Mass Spectrom (2010) 1.22

MASH Suite: a user-friendly and versatile software interface for high-resolution mass spectrometry data interpretation and visualization. J Am Soc Mass Spectrom (2014) 1.17

Analysis of intact protein isoforms by mass spectrometry. J Biol Chem (2011) 1.15

Pathogenic properties of the N-terminal region of cardiac myosin binding protein-C in vitro. J Muscle Res Cell Motil (2012) 1.14

Protein kinase A-induced myofilament desensitization to Ca(2+) as a result of phosphorylation of cardiac myosin-binding protein C. J Gen Physiol (2010) 1.10

Automethylation of CARM1 allows coupling of transcription and mRNA splicing. Nucleic Acids Res (2010) 1.09

Top-down proteomics in health and disease: challenges and opportunities. Proteomics (2014) 1.08

Top-down targeted proteomics for deep sequencing of tropomyosin isoforms. J Proteome Res (2012) 1.07

Top-down proteomics reveals concerted reductions in myofilament and Z-disc protein phosphorylation after acute myocardial infarction. Mol Cell Proteomics (2014) 1.07

Analysis of intact monoclonal antibody IgG1 by electron transfer dissociation Orbitrap FTMS. Mol Cell Proteomics (2012) 1.04

A preferred AMPK phosphorylation site adjacent to the inhibitory loop of cardiac and skeletal troponin I. Protein Sci (2011) 1.00

Automatic figure ranking and user interfacing for intelligent figure search. PLoS One (2010) 1.00

Nano-LC FTICR tandem mass spectrometry for top-down proteomics: routine baseline unit mass resolution of whole cell lysate proteins up to 72 kDa. Anal Chem (2012) 0.97

Unit mass baseline resolution for an intact 148 kDa therapeutic monoclonal antibody by Fourier transform ion cyclotron resonance mass spectrometry. Anal Chem (2011) 0.95

Progress in Top-Down Proteomics and the Analysis of Proteoforms. Annu Rev Anal Chem (Palo Alto Calif) (2016) 0.94

Middle-down mass spectrometry enables characterization of branched ubiquitin chains. Biochemistry (2014) 0.92

Earning stripes: myosin binding protein-C interactions with actin. Pflugers Arch (2014) 0.92

A multi-scale strategy for discovery of novel endogenous neuropeptides in the crustacean nervous system. J Proteomics (2013) 0.91

Doxorubicin-induced carbonylation and degradation of cardiac myosin binding protein C promote cardiotoxicity. Proc Natl Acad Sci U S A (2014) 0.91

Phosphorylation, but not alternative splicing or proteolytic degradation, is conserved in human and mouse cardiac troponin T. Biochemistry (2011) 0.90

Myocardial infarction-induced N-terminal fragment of cardiac myosin-binding protein C (cMyBP-C) impairs myofilament function in human myocardium. J Biol Chem (2014) 0.90

Revealing ligand binding sites and quantifying subunit variants of noncovalent protein complexes in a single native top-down FTICR MS experiment. J Am Soc Mass Spectrom (2014) 0.90

In-depth proteomic analysis of human tropomyosin by top-down mass spectrometry. J Muscle Res Cell Motil (2013) 0.89

High mass selectivity for top-down proteomics by application of SWIFT technology. J Am Soc Mass Spectrom (2009) 0.89

Native top-down electrospray ionization-mass spectrometry of 158 kDa protein complex by high-resolution Fourier transform ion cyclotron resonance mass spectrometry. Anal Chem (2013) 0.88

MASH Suite Pro: A Comprehensive Software Tool for Top-Down Proteomics. Mol Cell Proteomics (2015) 0.87

New protein footprinting: fast photochemical iodination combined with top-down and bottom-up mass spectrometry. J Am Soc Mass Spectrom (2012) 0.86

High-definition de novo sequencing of crustacean hyperglycemic hormone (CHH)-family neuropeptides. Mol Cell Proteomics (2012) 0.86

Top-down Proteomics: Technology Advancements and Applications to Heart Diseases. Expert Rev Proteomics (2016) 0.86

Three dimensional liquid chromatography coupling ion exchange chromatography/hydrophobic interaction chromatography/reverse phase chromatography for effective protein separation in top-down proteomics. Anal Chem (2015) 0.86

Modern approaches for investigating epigenetic signaling pathways. J Appl Physiol (1985) (2010) 0.84

Mass spectrometry-based detection and assignment of protein posttranslational modifications. ACS Chem Biol (2015) 0.84

Specific enrichment of phosphoproteins using functionalized multivalent nanoparticles. J Am Chem Soc (2015) 0.83

Increased protein structural resolution from diethylpyrocarbonate-based covalent labeling and mass spectrometric detection. J Am Soc Mass Spectrom (2012) 0.83

Surviving the infarct: A profile of cardiac myosin binding protein-C pathogenicity, diagnostic utility, and proteomics in the ischemic myocardium. Proteomics Clin Appl (2014) 0.82

Ultrahigh pressure fast size exclusion chromatography for top-down proteomics. Proteomics (2013) 0.82

Effective enrichment and mass spectrometry analysis of phosphopeptides using mesoporous metal oxide nanomaterials. Anal Chem (2010) 0.82

Proteomics in heart failure: top-down or bottom-up? Pflugers Arch (2014) 0.81

Top-down mass spectrometry of cardiac myofilament proteins in health and disease. Proteomics Clin Appl (2014) 0.81

High throughput screening of disulfide-containing proteins in a complex mixture. Proteomics (2013) 0.81

COOH-terminal truncation of flightin decreases myofilament lattice organization, cross-bridge binding, and power output in Drosophila indirect flight muscle. Am J Physiol Cell Physiol (2011) 0.81

Effective top-down LC/MS+ method for assessing actin isoforms as a potential cardiac disease marker. Anal Chem (2015) 0.81

Online Hydrophobic Interaction Chromatography-Mass Spectrometry for Top-Down Proteomics. Anal Chem (2016) 0.81

The impact of antibody selection on the detection of cardiac troponin I. Clin Chim Acta (2012) 0.80

Limited proteolysis via millisecond digestions in protease-modified membranes. Anal Chem (2012) 0.79

Nitroxyl, redox switches, cardiac myofilaments, and heart failure: a prequel to novel therapeutics? Circ Res (2012) 0.78

Mechanism of action of thalassospiramides, a new class of calpain inhibitors. Sci Rep (2015) 0.77

Cross-species mechanical fingerprinting of cardiac myosin binding protein-C. Biophys J (2013) 0.77

Dissecting human skeletal muscle troponin proteoforms by top-down mass spectrometry. J Muscle Res Cell Motil (2015) 0.77

Radical-directed dissociation of peptides and proteins by infrared multiphoton dissociation and sustained off-resonance irradiation collision-induced dissociation with Fourier transform ion cyclotron resonance mass spectrometry. Rapid Commun Mass Spectrom (2014) 0.77

Comprehensive Characterization of AMP-Activated Protein Kinase Catalytic Domain by Top-Down Mass Spectrometry. J Am Soc Mass Spectrom (2016) 0.77

Phosphoproteomics with Activated Ion Electron Transfer Dissociation. Anal Chem (2017) 0.77

Comprehensive analysis of tropomyosin isoforms in skeletal muscles by top-down proteomics. J Muscle Res Cell Motil (2016) 0.76

Proteomics Research in Cardiovascular Medicine and Biomarker Discovery. J Am Coll Cardiol (2016) 0.76

Why is it important to analyze the cardiac sarcomere subproteome? Expert Rev Proteomics (2010) 0.76

Top-Down Targeted Proteomics Reveals Decrease in Myosin Regulatory Light-Chain Phosphorylation That Contributes to Sarcopenic Muscle Dysfunction. J Proteome Res (2016) 0.75

Distinct sequences and post-translational modifications in cardiac atrial and ventricular myosin light chains revealed by top-down mass spectrometry. J Mol Cell Cardiol (2017) 0.75

The Impact of Phosphorylation on Electron Capture Dissociation of Proteins: A Top-Down Perspective. J Am Soc Mass Spectrom (2017) 0.75

Articles cited by this

Proteomic analysis of post-translational modifications. Nat Biotechnol (2003) 5.87

Electron capture dissociation for structural characterization of multiply charged protein cations. Anal Chem (2000) 4.93

The management of hypertrophic cardiomyopathy. N Engl J Med (1997) 4.15

Precision proteomics: the case for high resolution and high mass accuracy. Proc Natl Acad Sci U S A (2008) 4.00

Extending top-down mass spectrometry to proteins with masses greater than 200 kilodaltons. Science (2006) 3.93

Myosin binding protein C, a phosphorylation-dependent force regulator in muscle that controls the attachment of myosin heads by its interaction with myosin S2. Circ Res (2000) 3.32

Phosphorylation switches specific for the cardiac isoform of myosin binding protein-C: a modulator of cardiac contraction? EMBO J (1995) 3.28

Quantitative analysis of modified proteins and their positional isomers by tandem mass spectrometry: human histone H4. Anal Chem (2006) 3.08

Top down characterization of larger proteins (45 kDa) by electron capture dissociation mass spectrometry. J Am Chem Soc (2002) 2.72

Cardiac myosin-binding protein-C phosphorylation and cardiac function. Circ Res (2005) 2.67

Decoding protein modifications using top-down mass spectrometry. Nat Methods (2007) 2.62

Collisional activation of large multiply charged ions using Fourier transform mass spectrometry. Anal Chem (1994) 2.58

Localization of O-glycosylation sites in peptides by electron capture dissociation in a Fourier transform mass spectrometer. Anal Chem (1999) 2.48

Cardiac myosin binding protein C phosphorylation is cardioprotective. Proc Natl Acad Sci U S A (2006) 2.46

Localization of labile posttranslational modifications by electron capture dissociation: the case of gamma-carboxyglutamic acid. Anal Chem (1999) 2.43

The role of electron capture dissociation in biomolecular analysis. Mass Spectrom Rev (2005) 2.42

Three-dimensional structure of vertebrate cardiac muscle myosin filaments. Proc Natl Acad Sci U S A (2008) 2.39

Cardiac myosin binding protein C: its role in physiology and disease. Circ Res (2004) 2.38

Myosin crossbridge activation of cardiac thin filaments: implications for myocardial function in health and disease. Circ Res (2004) 2.35

A molecular map of the interactions between titin and myosin-binding protein C. Implications for sarcomeric assembly in familial hypertrophic cardiomyopathy. Eur J Biochem (1996) 2.34

Combinatorial modification of human histone H4 quantitated by two-dimensional liquid chromatography coupled with top down mass spectrometry. J Biol Chem (2008) 2.28

cAPK-phosphorylation controls the interaction of the regulatory domain of cardiac myosin binding protein C with myosin-S2 in an on-off fashion. FEBS Lett (1999) 2.16

Differential roles of cardiac myosin-binding protein C and cardiac troponin I in the myofibrillar force responses to protein kinase A phosphorylation. Circ Res (2007) 2.11

Ablation of cardiac myosin-binding protein-C accelerates stretch activation in murine skinned myocardium. Circ Res (2006) 2.10

Alteration of myosin cross bridges by phosphorylation of myosin-binding protein C in cardiac muscle. Proc Natl Acad Sci U S A (1996) 2.02

Chemistry. Mass spectrometry: bottom-up or top-down? Science (2006) 1.90

Cardiac myosin-binding protein C decorates F-actin: implications for cardiac function. Proc Natl Acad Sci U S A (2008) 1.84

Effects of the N-terminal domains of myosin binding protein-C in an in vitro motility assay: Evidence for long-lived cross-bridges. J Biol Chem (2006) 1.81

Unraveling molecular complexity of phosphorylated human cardiac troponin I by top down electron capture dissociation/electron transfer dissociation mass spectrometry. Mol Cell Proteomics (2008) 1.73

Cardiac myosin-binding protein C (MyBP-C): identification of protein kinase A and protein kinase C phosphorylation sites. Arch Biochem Biophys (1998) 1.69

Top-down ESI-ECD-FT-ICR mass spectrometry localizes noncovalent protein-ligand binding sites. J Am Chem Soc (2006) 1.68

Myosin binding protein C is differentially phosphorylated upon myocardial stunning in canine and rat hearts-- evidence for novel phosphorylation sites. Proteomics (2006) 1.65

Protein kinase A-mediated phosphorylation of cMyBP-C increases proximity of myosin heads to actin in resting myocardium. Circ Res (2008) 1.55

Top down characterization of secreted proteins from Mycobacterium tuberculosis by electron capture dissociation mass spectrometry. J Am Soc Mass Spectrom (2003) 1.41

Characterization of a new qQq-FTICR mass spectrometer for post-translational modification analysis and top-down tandem mass spectrometry of whole proteins. J Am Soc Mass Spectrom (2005) 1.41

Techview: biochemistry. Biomolecule mass spectrometry. Science (1999) 1.39

Myosin binding protein-C: enigmatic regulator of cardiac contraction. Int J Biochem Cell Biol (2007) 1.28

Stepwise deamidation of ribonuclease A at five sites determined by top down mass spectrometry. Biochemistry (2006) 1.28

A new approach for plant proteomics: characterization of chloroplast proteins of Arabidopsis thaliana by top-down mass spectrometry. Mol Cell Proteomics (2003) 1.24

Quantitative comparison of sarcomeric phosphoproteomes of neonatal and adult rat hearts. Am J Physiol Heart Circ Physiol (2008) 1.20

Myosin binding protein C, a potential regulator of cardiac contractility. Circ Res (2000) 1.18

Increased coverage in the transmembrane domain with activated-ion electron capture dissociation for top-down Fourier-transform mass spectrometry of integral membrane proteins. J Proteome Res (2007) 1.17

Detection of four oxidation sites in viral prolyl-4-hydroxylase by top-down mass spectrometry. Protein Sci (2003) 1.13

Detecting deamidation products in proteins by electron capture dissociation. Anal Chem (2006) 1.12

Crystal structure of the C1 domain of cardiac myosin binding protein-C: implications for hypertrophic cardiomyopathy. J Mol Biol (2008) 1.01

Myosin binding protein C in the heart. Circ Res (2006) 0.98

On studying protein phosphorylation patterns using bottom-up LC-MS/MS: the case of human alpha-casein. Analyst (2007) 0.92

Articles by these authors

Hypertrophic cardiomyopathy in cardiac myosin binding protein-C knockout mice. Circ Res (2002) 2.82

Protein kinase A-mediated acceleration of the stretch activation response in murine skinned myocardium is eliminated by ablation of cMyBP-C. Circ Res (2006) 2.50

Three-dimensional structure of vertebrate cardiac muscle myosin filaments. Proc Natl Acad Sci U S A (2008) 2.39

Top-down quantitative proteomics identified phosphorylation of cardiac troponin I as a candidate biomarker for chronic heart failure. J Proteome Res (2011) 2.17

Differential roles of cardiac myosin-binding protein C and cardiac troponin I in the myofibrillar force responses to protein kinase A phosphorylation. Circ Res (2007) 2.11

Ablation of cardiac myosin-binding protein-C accelerates stretch activation in murine skinned myocardium. Circ Res (2006) 2.10

Acceleration of crossbridge kinetics by protein kinase A phosphorylation of cardiac myosin binding protein C modulates cardiac function. Circ Res (2008) 2.07

Basal myosin light chain phosphorylation is a determinant of Ca2+ sensitivity of force and activation dependence of the kinetics of myocardial force development. Am J Physiol Heart Circ Physiol (2004) 1.93

Loaded shortening, power output, and rate of force redevelopment are increased with knockout of cardiac myosin binding protein-C. Circ Res (2003) 1.81

Differential roles of regulatory light chain and myosin binding protein-C phosphorylations in the modulation of cardiac force development. J Physiol (2010) 1.76

Ablation of myosin-binding protein-C accelerates force development in mouse myocardium. Biophys J (2006) 1.69

Cytoplasmic gamma-actin contributes to a compensatory remodeling response in dystrophin-deficient muscle. Proc Natl Acad Sci U S A (2006) 1.68

Mouse and computational models link Mlc2v dephosphorylation to altered myosin kinetics in early cardiac disease. J Clin Invest (2012) 1.59

Understanding the organisation and role of myosin binding protein C in normal striated muscle by comparison with MyBP-C knockout cardiac muscle. J Mol Biol (2008) 1.57

Protein kinase A-mediated phosphorylation of cMyBP-C increases proximity of myosin heads to actin in resting myocardium. Circ Res (2008) 1.55

Acceleration of stretch activation in murine myocardium due to phosphorylation of myosin regulatory light chain. J Gen Physiol (2006) 1.53

Role of cardiac myosin binding protein C in sustaining left ventricular systolic stiffening. Circ Res (2004) 1.52

Cytoplasmic gamma-actin is not required for skeletal muscle development but its absence leads to a progressive myopathy. Dev Cell (2006) 1.43

SLControl: PC-based data acquisition and analysis for muscle mechanics. Am J Physiol Heart Circ Physiol (2003) 1.36

Activation dependence of stretch activation in mouse skinned myocardium: implications for ventricular function. J Gen Physiol (2006) 1.35

Radial displacement of myosin cross-bridges in mouse myocardium due to ablation of myosin binding protein-C. J Mol Biol (2006) 1.33

Binding of myosin binding protein-C to myosin subfragment S2 affects contractility independent of a tether mechanism. Circ Res (2004) 1.33

Role of myosin heavy chain composition in the stretch activation response of rat myocardium. J Physiol (2006) 1.29

History-dependent mechanical properties of permeabilized rat soleus muscle fibers. Biophys J (2002) 1.29

Myosin binding protein C interaction with actin: characterization and mapping of the binding site. J Biol Chem (2010) 1.27

Mutation that dramatically alters rat titin isoform expression and cardiomyocyte passive tension. J Mol Cell Cardiol (2008) 1.20

Myosin light chain phosphorylation is critical for adaptation to cardiac stress. Circulation (2012) 1.19

Titin isoform changes in rat myocardium during development. Mech Dev (2004) 1.18

Myosin binding protein-C phosphorylation is the principal mediator of protein kinase A effects on thick filament structure in myocardium. J Mol Cell Cardiol (2012) 1.13

The utrophin actin-binding domain binds F-actin in two different modes: implications for the spectrin superfamily of proteins. J Cell Biol (2002) 1.12

Protein kinase A-induced myofilament desensitization to Ca(2+) as a result of phosphorylation of cardiac myosin-binding protein C. J Gen Physiol (2010) 1.10

Expression of Dp260 in muscle tethers the actin cytoskeleton to the dystrophin-glycoprotein complex and partially prevents dystrophy. Hum Mol Genet (2002) 1.10

Developmental changes in rat cardiac titin/connectin: transitions in normal animals and in mutants with a delayed pattern of isoform transition. J Muscle Res Cell Motil (2005) 1.09

Top-down targeted proteomics for deep sequencing of tropomyosin isoforms. J Proteome Res (2012) 1.07

Myosin light chain 2 into the mainstream of cardiac development and contractility. Circ Res (2006) 1.05

Discovery and optimization of a series of quinazolinone-derived antagonists of CXCR3. Bioorg Med Chem Lett (2007) 1.04

Frank-Starling relationship: long on importance, short on mechanism. Circ Res (2002) 1.04

Transmural variation in myosin heavy chain isoform expression modulates the timing of myocardial force generation in porcine left ventricle. J Physiol (2008) 1.03

Cooperativity in the regulation of force and the kinetics of force development in heart and skeletal muscles: cross-bridge activation of force. Adv Exp Med Biol (2007) 1.03

Contributions of stretch activation to length-dependent contraction in murine myocardium. J Gen Physiol (2006) 1.00

Expression of cardiac troponin T with COOH-terminal truncation accelerates cross-bridge interaction kinetics in mouse myocardium. Am J Physiol Heart Circ Physiol (2004) 0.97

Delineating Anopheles gambiae coactivator associated arginine methyltransferase 1 automethylation using top-down high resolution tandem mass spectrometry. Protein Sci (2009) 0.96

Magnitude of length-dependent changes in contractile properties varies with titin isoform in rat ventricles. Am J Physiol Heart Circ Physiol (2011) 0.96

Cycling cross-bridges increase myocardial stiffness at submaximal levels of Ca2+ activation. Biophys J (2003) 0.95

Cardiac myosin binding protein-C restricts intrafilament torsional dynamics of actin in a phosphorylation-dependent manner. Proc Natl Acad Sci U S A (2012) 0.94

Determination of rate constants for turnover of myosin isoforms in rat myocardium: implications for in vivo contractile kinetics. Am J Physiol Heart Circ Physiol (2009) 0.91

Phosphorylation, but not alternative splicing or proteolytic degradation, is conserved in human and mouse cardiac troponin T. Biochemistry (2011) 0.90

Dissociation of structural and functional phenotypes in cardiac myosin-binding protein C conditional knockout mice. Circulation (2012) 0.89

Overexpression of TEAD-1 in transgenic mouse striated muscles produces a slower skeletal muscle contractile phenotype. J Biol Chem (2008) 0.89

Ablation of the cardiac-specific gene leucine-rich repeat containing 10 (Lrrc10) results in dilated cardiomyopathy. PLoS One (2012) 0.88

Expression patterns of cardiac myofilament proteins: genomic and protein analysis of surgical myectomy tissue from patients with obstructive hypertrophic cardiomyopathy. Circ Heart Fail (2009) 0.86

Effects of low-level α-myosin heavy chain expression on contractile kinetics in porcine myocardium. Am J Physiol Heart Circ Physiol (2011) 0.85

Solution structure of heavy meromyosin by small-angle scattering. J Biol Chem (2002) 0.85

Mesoporous zirconium oxide nanomaterials effectively enrich phosphopeptides for mass spectrometry-based phosphoproteomics. Chem Commun (Camb) (2009) 0.84

Resolving myoarchitectural disarray in the mouse ventricular wall with diffusion spectrum magnetic resonance imaging. Ann Biomed Eng (2010) 0.84

Differential modification of Cys10 alters transthyretin's effect on beta-amyloid aggregation and toxicity. Protein Eng Des Sel (2009) 0.82

Optimization of 2-aminothiazole derivatives as CCR4 antagonists. Bioorg Med Chem Lett (2006) 0.82

Intramolecular interactions in the N-domain of cardiac troponin C are important determinants of calcium sensitivity of force development. Biochemistry (2008) 0.82

Effective enrichment and mass spectrometry analysis of phosphopeptides using mesoporous metal oxide nanomaterials. Anal Chem (2010) 0.82

The impact of antibody selection on the detection of cardiac troponin I. Clin Chim Acta (2012) 0.80

Nitroxyl, redox switches, cardiac myofilaments, and heart failure: a prequel to novel therapeutics? Circ Res (2012) 0.78

Dissecting human skeletal muscle troponin proteoforms by top-down mass spectrometry. J Muscle Res Cell Motil (2015) 0.77

Cardiac tissue structure, properties, and performance: a materials science perspective. Ann Biomed Eng (2014) 0.77

Medicine. Chemically tuned myosin motors. Science (2011) 0.75

Removal of contaminating calcium from buffer solutions used in calcium binding assays. Anal Biochem (2007) 0.75