Protein Array
Protein Array - Related Videos
06:32
Reverse Phase Protein Arrays Based Protein Expression Analysis: A Procedure for Simultaneous Quantification of Expression of Multiple Proteins from Cell Lysate
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2023
This video demonstrates the methodology for performing Reverse Phase Protein Arrays (RPPA) to study protein expression patterns from cell lysate. In RPPA, the lysate containing a mixture of proteins is printed on nitrocellulose slides and proteins of interest are analyzed using fluorescently labeled antibodies.
07:44
Identifying Protein-protein Interaction Sites Using Peptide Arrays
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Cited by 18 •
2014
Peptide array screening is a high throughput assay for identifying protein-protein interaction sites. This allows mapping multiple interactions of a target protein and can serve as a method for identifying sites for inhibitors that target a protein. Here we describe a protocol for screening and analyzing peptide arrays.
12:22
The Use of Reverse Phase Protein Arrays (RPPA) to Explore Protein Expression Variation within Individual Renal Cell Cancers
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Cited by 12 •
2013
RPPA enables the protein expression of hundreds of samples, printed on nitrocellulose slides to be interrogated simultaneously, using fluorescently labelled antibodies. This technique has been applied to study the effect of drug treatment heterogeneity within clear cell renal carcinoma.
09:16
Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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Cited by 7 •
2015
Array CGH for the detection of genomic copy number variants has replaced G-banded karyotype analysis. This paper describes the technology and its application in a diagnostic service laboratory.
08:48
Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays
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Cited by 36 •
2014
Peptide arrays synthesized by the SPOT method can be used to analyze the substrate specificity of Protein lysine methyltransferases (PKMTs) and to define the substrate spectrum of PKMTs to understand their biological role. This protocol describes how to synthesize peptide arrays, methylate them with PKMTs, and analyze the results.
FAQs
Spatially separated spots allow each protein to be interpreted as an individual test location while many locations are analyzed together. Because the identity of each protein is linked to its position, a binding or activity signal can be assigned to a particular target rather than treated as an undifferentiated mixture. This organization enables parallel molecular measurements.
Detection begins when labeled antibodies, peptides, nucleic acids, or other analytes contact the immobilized proteins. Specific binding produces fluorescence or a related measurable signal at the corresponding spot. The location and intensity of that signal provide evidence about which protein-analyte interactions occurred, allowing many binding events to be examined in one experiment.
Protein arrays can support several kinds of functional investigation, including protein-protein interaction studies, enzyme activity measurements, antibody specificity testing, and evaluation of biomarker candidates. These uses extend analysis from identifying binding partners to examining protein function and recognition. The selected proteins and analytes determine which biological question the array can address.
Parallel measurement increases experimental scale while reducing the amount of sample and reagent needed for each analysis. In bioengineering, this efficiency helps researchers characterize complex biological systems by examining many proteins or interactions in a coordinated format. The resulting data can inform studies in diagnostics, therapeutics, and synthetic biology.
A typical workflow starts by immobilizing distinct proteins in identified spots on a solid surface. Researchers then apply labeled antibodies, peptides, nucleic acids, or other analytes to the array so specific interactions can occur. Afterward, fluorescence or another related signal is detected and associated with the relevant spot to interpret binding or activity.
The array can be probed with labeled antibodies, peptides, nucleic acids, or other analytes. This choice determines the type of molecular recognition or function being examined, such as antibody specificity, protein interactions, or interactions involving nucleic acids. Matching the analyte to the research question helps generate an interpretable signal from the immobilized proteins.
Researchers may use protein arrays to evaluate potential biomarker candidates, investigate antibody specificity, or examine molecular interactions relevant to therapeutic targets. Their high-throughput format supports comparison across many proteins while conserving sample and reagent quantities. These capabilities make the platform useful when broad molecular characterization is needed before diagnostic or therapeutic development.