A comprehensive two-hybrid analysis was conducted to explore the yeast protein interactome. The study identified 4,549 two-hybrid interactions among 3,278 proteins in the budding yeast Saccharomyces cerevisiae. These data significantly expanded the understanding of the yeast protein interaction space, as they do not largely overlap with those from other projects. The results were used to construct a large network of protein interactions, revealing various intriguing subnetworks, including those related to autophagy, spindle pole body function, and vesicular transport. The study also highlighted the importance of functional genomics in understanding the molecular mechanisms of cellular processes. However, the large-scale two-hybrid approach has limitations, such as the potential for false positives and the need for complementary methods to fully map the protein interactome. The study emphasizes the importance of integrating data from multiple approaches to improve the accuracy and completeness of protein interaction maps. The results provide valuable insights into the functional roles of yeast proteins and contribute to the broader understanding of cellular processes. The study also discusses the challenges and limitations of large-scale two-hybrid analysis and the need for further research to refine and expand the protein interaction maps. The findings underscore the importance of continued efforts in functional genomics to fully explore the complexities of the yeast interactome.A comprehensive two-hybrid analysis was conducted to explore the yeast protein interactome. The study identified 4,549 two-hybrid interactions among 3,278 proteins in the budding yeast Saccharomyces cerevisiae. These data significantly expanded the understanding of the yeast protein interaction space, as they do not largely overlap with those from other projects. The results were used to construct a large network of protein interactions, revealing various intriguing subnetworks, including those related to autophagy, spindle pole body function, and vesicular transport. The study also highlighted the importance of functional genomics in understanding the molecular mechanisms of cellular processes. However, the large-scale two-hybrid approach has limitations, such as the potential for false positives and the need for complementary methods to fully map the protein interactome. The study emphasizes the importance of integrating data from multiple approaches to improve the accuracy and completeness of protein interaction maps. The results provide valuable insights into the functional roles of yeast proteins and contribute to the broader understanding of cellular processes. The study also discusses the challenges and limitations of large-scale two-hybrid analysis and the need for further research to refine and expand the protein interaction maps. The findings underscore the importance of continued efforts in functional genomics to fully explore the complexities of the yeast interactome.