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In some embodiments, a selectively labeled protein of the invention lacks residues of a second amino acid that can react with a labeling compound. Field of the Invention. Novex sharp prestained protein standard.com. Illustrative biological examples include urine, sera, blood plasma, total blood, saliva, tear fluid, cerebrospinal fluid, secretory fluids from nipples and the like. 0 L of BRM-Amp, 30° C., 18 hrs, uninduced, to verify expression performance. The b-chain eluted in the wash buffer. Nonlimiting examples of textiles dyes are Remazol dyes, Kemozol dyes, Direct dyes, Disperse dyes, Dischargeable acid dyes, Kenanthol dyes, Kenamide dyes, Cibacron dyes, azoic dyes, Dyacid dyes, Kemtex reactive dyes, Kemtex acid dyes, Kemtex Easidye acid dyes, Caledon dyes, Cassulfon dyes, Isolan dyes, Sirius dyes, Imperon dyes, phtalogen dyes, naphtol dyes, Levafix dyes, Procion dyes, and isothiocyanate dyes. 1% SDS and then the sample was loaded.
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The column was washed thoroughly with water after the dye was loaded. Application||Abreviews||Notes|. As a nonlimiting example, a pre-labeled protein standard set can comprise from five to twenty labeled proteins, of which from two to twenty comprise a label on cysteine residues and lack lysine residues, and have ratios of cysteine residue number to molecular weight that are within 5% of one another. For example, in some embodiments of pre-labeled protein standard sets, one or more selectively labeled protein standards of the set comprises one or more copies of an amino acid sequence that is not known to have homology to a naturally-occurring protein and the one or more selectively labeled proteins is labeled on a first, or target, amino acid and is depleted in a second (non-target) amino acid. As nonlimiting examples, a fluorophore used to label a protein standard can be an Alexa fluor dye, a BODIPY dye, fluoroscein or a derivative thereof, eosin or a derivative thereof, tetramethylrhodamine, rhodamine or a derivative thereof, Texas red or a derivative thereof, pyridyloxazole or a derivative thereof, NBD chloride, NBD fluoride, ABD-F, lucifer yellow or a derivative thereof, 8-anilino-1-naphthalenesulfonic acid (8-ANS) or a derivative thereof, or Oregon green or a derivative thereof. 25 lpm air, 500 rpm agitation, and the pH is controlled to 6. The truncated LacZ ORF was excised from the cloning vector with Avr II digestion and the fragment was gel purified. In some illustrative embodiments of these aspects of the invention, a selectively labeled protein standard is a protein that is labeled on a target amino acid and comprises one or more copies of an amino acid sequence that is homologous to a sequence of a naturally-occurring protein, in which the sequence having homology to an amino acid sequence of a naturally-occurring protein sequence lacks a non-target amino acid. Prestained protein ladder novex. Migration of selectively labeled and unlabeled forms of a protein are preferably compared under electrophoresis conditions in which a the loading dye front migrates at least 6. The final OD is generally 10 or greater. Invitrogen™ Novex™ Sharp Pre-stained Protein Standard. The 1314 bp inserts (50 kDa) were gel purified on a 1. A protein that is depleted in residues of a second amino acid can have no residues of a second amino acid.
PTrc 260 kd Expression Vector: A 260 kDa protein expression vector, pTrc 160+LacZ, was also constructed. 3 colors: Pink, Yellow, Blue|. In some preferred embodiments, the two or more labeled proteins that have a consistent ratio of the number of residues of a first, or target, amino acid to molecular weight of the proteins are selectively labeled on a first amino acid. In some preferred embodiments, the proteins having ratios of first amino acid to molecular weight within 10%, 5%, 2. Centrifuge capable of obtaining 10, 000×g force. 50 kd Inserts used for High Molecular Weight Marker Constructs. Protein Quantitation. The selection of a particular reactive chemical group on the dye to be conjugated to a protein and manipulation of reaction conditions at which a chemical conjugation is performed (such as, for example, pH) will typically favor conjugation of a dye to one or more particular amino acids. The column is attached to a stand and the liquid is drained from the column. 5 cm from the loading site and migration of a protein calculated to be about 10 kDa and the migration of a protein calculated to about 80 kDa are at least 3. SUMMARY OF THE INVENTION. Preferably, in these embodiments, the two or more proteins labeled on a target amino acid are selectively labeled with a labeling compound on the target amino acid. In some preferred embodiments, a pre-labeled protein standard set of the invention includes five or more labeled proteins, in which at least 40% of the five or more labeled proteins differ from one another by a multiple of 10 kDa. Novex sharp prestained protein standard.html. The protein is centrifuged at 8000×g for 10 minutes and liquid is discarded taking care not to discard the protein pellet.
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Migration of Pre-labeled Standard Set on 4-20% Tris glycine gel. For example, labeling of a particular protein with a dye that has high specificity for a first amino acid and reduced specificity for a second amino acid can result in a population of labeled protein variants, in which the variants are predominantly labeled on the first amino acid, but vary in the degree of labeling of the second amino acid that is present on the protein. The extracted trace was loaded in The baseline was adjusted and peaks were selected. The selectively labeled proteins provided in some preferred embodiments of aspects of the invention do not differ substantially in their migration in denaturing acrylamide electrophoresis gels from the migration of the same proteins in unlabeled form. PTrc 160 kd Expression Vector: TA clone 50. In some preferred embodiments of the invention, a protein used as a pre-labeled molecular weight standard includes one or more copies of an amino acid sequence derived from a thioredoxin sequence. Examples of nucleotide-disulfide oxidoreductases include lipoamide dehydrogenase, glutathione reductase, or thioredoxin. Novex™ Sharp Pre-stained Protein Standard. A sample can include one or more partially or substantially purified biomolecules or analyte. In making labeled protein standards of the invention, a target amino acid is an amino acid whose labeling is intended; the labeling of a protein on a target amino acid is achieved by selecting a labeling compound with a reactive chemical group that reacts with the reactive chemical group on the target amino acid. For example, the sulfhydryl group of cysteine is generally a stronger nucleophile than the amino groups of lysine, the N-terminus of a protein, histidine, and tryptophan, which are stronger nucleophiles than the carboxyl groups of the C-terminus of a protein, aspartic acid, and glutamic acid, and the phenolate of tyrosine. Preferably, conjugation to form a covalent bond consists of simply mixing the reactive compounds of the present invention in a suitable solvent in which both the reactive compound and the substance to be conjugated are soluble. The kit can also include instructions for use, or instructions for accessing protocols for use of the kit or its components via the internet. The bovine insulin b-chain was purified by reduction of bovine pancreas insulin (Sigma-Aldrich, St. Louis, Mo., USA) at denaturing conditions and then separation of the b-chain on an ion exchange column.
"Conservative amino acid substitutions" refer to the interchangeability of residues having similar side chains. The six Thio insert (1595 bp) was gel purified and eluted using a S. N. A. P™ resin mini column (Invitrogen, Carlsbad, Calif., USA) and centrifugation at 14, 000 rpm for 10 minutes at room temperature and ligated to a modified pTrc LacZ-Flash vector. In another embodiment, the method includes: providing a pre-labeled protein standard set to a customer, in which two or more of the labeled proteins of the standard set is selectively labeled on a first amino acid and at least two of the two or more selectively labeled proteins have a constant ratio of a first amino acid to molecular weight, in exchange for revenue. The sample is allowed to cool down for 5 minutes at room temperature (or until the temperature drops to 30° C. ) and then 5. This application is a division of U. S. application Ser. One or more proteins of a set of labeled protein standards can be selectively labeled, for example, on the sulfhydryl group of cysteine, on the primary amine of an N-terminal amino acid and/or the primary amine of lysine, on the secondary amine of the imidazoyl group of histidine or the indole ring of tryptophan, on the carboxyl groups of the C-terminal amino acid or of aspartate or glutamate, on the thioether of methionine, on the phenolate of tyrosine, or on the amidino group of asparagine. Using the pTrc BH 60 kDa expression construct of Example 1 as the PCR template, several 50 kDa inserts were generated using Platinum® PCR Supermix High Fidelity PCR mix (Invitrogen; Carlsbad, Calif. ) that contained Taq DNA polymerase, Pyrococcus species GB-D thermostable polymerase, Platinum® anti-Taq polymerase antibody, 66 mM Tris-504 (pH 8. In a further aspect, the invention provides methods of labeling proteins that include attaching a label to one or more cysteine residues to a protein that lacks lysine residues. 8 using KOH or 5 M H3PO4. 5 to 260 kDa and is supplied in a ready-to-use format for direct loading onto gels; no need to heat, reduce, or add sample buffer prior to use. The calculated molecular weights of the proteins can be performed by curve-fitting of molecular weight to migration distances or point-to-point calculation.
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In targeting an amino acid for labeling, a labeling compound is selected that has a reactive group that specifically reacts with the reactive group of the target amino acid to form a covalent bond, thereby forming a labeling compound-protein conjugate, or labeled protein. 5-fold among the proteins of the set. The standards can have two or more, three or more, four or more, five or more, or six or more protein standards that differ by an increment that is a multiple of 10 kDa (plus or minus 1 kDa). Category:||Molekularbiologie|. Labeling of Standard Proteins with Dyes.
Lane 4: Elite Protein Ladder 10µl. The diazonium salt was transferred to an addition funnel and the diazonium salt solution was added to the solution of 8-ANS dropwise with stirring. To generate chimeric nucleic acid molecules, generate nucleotide sequence changes, or add or delete nucleic acids to a nucleic acid sequence. For example, a polypeptide or polynucleotide sequence that is present in an organism, including viruses, that can be isolated from a source in nature, and that has not been intentionally modified in the laboratory is naturally-occurring.
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Proteins are covalently coupled with a blue chromophore except for two reference bands (one green and one red band at 25 kDa and 75 kDa respectively) when separated on SDS-PAGE(Tris-glycine buffer). As used herein, the articles "a, " "an" and "one" mean "at least one" or "one or more" of the object to which they refer, unless otherwise specified or made clear by the context in which they appear herein. Accurate - sharp bands for the accurate estimation of molecular weight. 14B shows the same set of markers in unlabeled form electrophoresed on a 4-12% Bis-Tris gel with MES running buffer. Insulin b-Chain Purification. The 60 kDa BenchMark™ molecular weight marker protein includes six fused copies of a truncated E. coli thioredoxin protein (see U. The proteins of a pre-labeled protein standard set provided in some preferred embodiments of aspects of the invention, when electrophoresed on a denaturing polyacrylamide gel, produce bands with widths that do not differ by more than two-fold between different proteins of the set that have molecular weights of 10 kDa or greater. This mixture was added to an addition funnel and placed on top of the flask containing the 4-aminophenyl-2-sulfonatoethyl sulfone. Journal of Biological Chemistry 269: 15683 (1994)) or a sequence of one or more Bacillus megaterium spore proteins that lack cysteine residues (Setlow, Journal of Biological Chemistry 250: 8168 (1975)).
In some preferred methods of labeling cysteine residues, the reducing agent is beta-mercaptoethanol, dithiothreitol, TCEP, or TBP. The 5′end of the six Thio repeat ORF contained a Bgl II site and the 3′ end, containing the five unique restriction sites followed by a ten HIS sequence and capped with a Pme I site. In one aspect, the invention includes a pre-labeled protein standard set that includes two or more proteins selectively labeled on a first amino acid with a labeling compound and depleted in a second amino acid capable of reacting with the labeling compound, in which the two or more selectively labeled proteins includes different numbers of copies of an amino acid sequence having at least 70% homology to at least 30 contiguous amino acids of a sequence of a naturally-occurring protein. The sequence having homology with another amino acid sequence has at least six amino acids, preferably at least 10 amino acids, and more preferably at least twenty, at least thirty, or at least forty contiguous amino acids of the protein, peptide, or amino acid sequence referred to. CCGGAGATCTATGTGTGATCGTATTATTCA. 4 mM MgSO4; 220 μM dNTPs; and stabilizers; with the following primer sets: |50. A sample that includes 1 μl of the concentrated molecular weight standard protein is prepared the same way and both samples are incubated for 10 minutes at 70° C. The BSA standard and molecular weight standard protein (5 μl of each) are run side by side on an electrophoresis gel.
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Novex™ Sharp Pre-stained Protein Standards are provided as 2 x 250 µL (total of 50 applications of 10 µL each) of ready-to-use standard mixture. In a preferred embodiment, one or more additional cysteine codons is added to a nucleic acid sequence encoding a truncated thioredoxin. The 20 kDa BenchMark™ protein standard includes a truncated thioredoxin fragment fused to two copies of a 5 kDa fragment of the E. coli DEAD-box protein (as disclosed in U. Sequences depleted in a non-target amino acid can be further selected based on the frequency of the target amino acid, e. g., cysteine. For example, a selectively labeled protein can comprise one or more copies of a sequence from the C-terminus of one or more ADP-ribosylation factors (Schurmann et al. 14A shows a pre-labeled protein standard set of the invention electrophoresed on a 4-12% Bis-Tris gel with 1×MES running buffer. The pre-labeled marker set of Example 11 was also electrophoresed on a 4-12% Bis-Tris (NuPAGE® Novex®) acrylamide gel run with 1×MES buffer, a 4-12% Bis-Tris (NuPAGE® Novex®) acrylamide gel run with 1×MOPS buffer, and a 4-20% Tris-glycine (Novex®) gel (FIG. 13/715, 812 filed Dec. 14, 2012, now U. Pat. All or a portion of a thioredoxin sequence can be used in making one or more pre-labeled protein standards. 0 M sodium carbonate solution was added.
The pre-labeled protein standard set can include two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, or more selectively labeled proteins that comprises different numbers of copies of an amino acid sequence that is depleted in residues of a second amino acid. A "nontarget amino acid" can have the same reactive chemical group as a target amino acid or a different reactive chemical group. XhoI and PmeI restriction digest screening identified a positive clone that was later confirmed by protein expression screening. In creating a six Thio repeat construct, the first of six Thio repeats of pTrcBH 60 kd was set at 208 bp (providing a translation product of 7.
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