The two-hybrid method facilitates the discovery of protein–protein interactions. How does this technique work? Can you think of reasons for obtaining a false-positive result, that is, where the proteins encoded by two clones interact in the two-hybrid system but do not interact in the organism in which they naturally occur? Can you think of reasons you might obtain a false-negative result, in which the two proteins interact in vivo but fail to interact in the two-hybrid system?
Table of contents
- 1. Introduction to Genetics51m
- 2. Mendel's Laws of Inheritance3h 37m
- 3. Extensions to Mendelian Inheritance2h 41m
- 4. Genetic Mapping and Linkage2h 28m
- 5. Genetics of Bacteria and Viruses1h 21m
- 6. Chromosomal Variation1h 48m
- 7. DNA and Chromosome Structure56m
- 8. DNA Replication1h 10m
- 9. Mitosis and Meiosis1h 34m
- 10. Transcription1h 0m
- 11. Translation58m
- 12. Gene Regulation in Prokaryotes1h 19m
- 13. Gene Regulation in Eukaryotes44m
- 14. Genetic Control of Development44m
- 15. Genomes and Genomics1h 50m
- 16. Transposable Elements47m
- 17. Mutation, Repair, and Recombination1h 6m
- 18. Molecular Genetic Tools19m
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
15. Genomes and Genomics
Proteomics
Problem 20a
Textbook Question
An interactive Web site for the Human Proteome Map (HPM) is available at http://www.humanproteomemap.org. Visit this site, and then answer the question.
How many proteins were identified in this project?

1
Visit the Human Proteome Map (HPM) website at http://www.humanproteomemap.org to access the data and resources related to the project.
Navigate to the section of the website that provides an overview or summary of the project results. Look for information regarding the total number of proteins identified.
If the information is not immediately visible, use the search or navigation tools provided on the website to locate the relevant dataset or publication associated with the project.
Review the data or publication to find the specific number of proteins identified in the Human Proteome Map project. This may be listed in a summary table, figure, or text description.
Ensure that the number you find corresponds to the total proteins identified and not a subset or specific category of proteins. Verify the information by cross-referencing with other sections of the website or related publications.

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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Human Proteome Map (HPM)
The Human Proteome Map (HPM) is a comprehensive project aimed at cataloging all the proteins expressed in human cells. It provides a detailed overview of the human proteome, which is essential for understanding cellular functions and disease mechanisms. The HPM serves as a valuable resource for researchers in fields such as genomics, proteomics, and personalized medicine.
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Proteomics
Proteomics is the large-scale study of proteins, particularly their functions and structures. It involves techniques such as mass spectrometry and two-dimensional gel electrophoresis to analyze protein expression, modifications, and interactions. Understanding proteomics is crucial for interpreting data from projects like the HPM, as it helps elucidate the roles of proteins in biological processes.
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Protein Identification
Protein identification refers to the methods used to determine the identity of proteins present in a sample. This process often involves comparing experimental data against databases of known protein sequences. Accurate protein identification is fundamental to projects like the HPM, as it allows researchers to quantify and characterize the proteins involved in various biological functions and diseases.
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