When Snells team changed just a single amino acid in the fusion a research paper on social media loop of Chlamydomonas HAP2, the protein lost its function entirely. The sex cells were able to stick togethera process that depends on other proteinsbut they were not able to complete the final fusion of their cell membranes. Similarly, the cells could not fuse when the researchers introduced an antibody that covered up the HAP2 fusion loop.We were thrilled with these results, because they supported our new model of HAP2 function, Snell said. But we needed to visualize the three-dimensional structure of the HAP2 protein to be sure it was similar to viral fusion proteins. Snell reached out to Felix Rey, a structural biologist at the Pasteur Institute in Paris who specializes in viruses.
This protein is widespread among viruses, single-celled protozoans, and many plants and arthropods, but is not found in fungi or vertebrates such as humans. William Snell, a senior author of the study and research professor at the University of Maryland, Department of Cell Biology and Molecular Genetics, and colleagues from the Pasteur Institute, University of Texas Southwestern Medical Center, Global Phasing, Ltd., Hannover Medical School and German Center for. The international research team notes that the protein, called HAP2, acts as a common, biochemical key that enables two cell membranes to become one, resulting in the combination of genetic materiala necessary step for sexual reproduction. The researchers say the findings suggest that the protein could provide a promising target for the development of vaccines, therapies and other disease control methods, which could help fight parasitic diseases, such as malaria, and boost efforts to control insect pests.Our findings show that nature has a limited number of ways it can cause cells to fuse together into a single cell, said Snell. A protein that first made sex possibleand is still used for sexual reproduction in many of Earths organismsis identical to the protein used by dengue and Zika viruses to enter human cells. This protein must have really put the spice in the primordial soup. Snell and team studied HAP2, in the single-celled green alga Chlamydomonas reinhardtii.HAP2 is common among single-celled protozoans and plants and arthropods. Prior results from Snell and collaborators, as well as other research groups, indicate that HAP2 is necessary for sex cell fusion in the organisms that possess the protein. But prior to this new study, help with dare essay the precise mechanism was unclear.For the current study, Snell and his UT Southwestern colleagues used sophisticated computer analysis tools to compare the amino acid sequence of Chlamydomonas HAP2 with that of known viral fusion proteins. The results suggested a striking degree of similarity, especially in a region called the fusion loop that allows the viral proteins to successfully invade a cell. If HAP2 functioned like a viral fusion protein, Snell reasoned, then disrupting HAP2s fusion loop should block its ability to fuse sex cells.
Retirement System Risk Management: Implications of the best essay on quaid e azam New Regulatory Order. Mitchell, Raimond Maurer, and.October 2016, the first half of this volume undertakes an assessment of how global responses to the financial crisis are potentially altering how insurers, pension plan sponsors, and policymakers will manage risk in the decades to come. The second half evaluates developments in retirement saving and retirement products, to determine which and how these might help meet shortfalls in retirement provision. Sexual reproduction and viral infections have a lot in common. According to new research, both processes rely on a single protein for the seamless fusion of two cellssperm and egg cells and virus and cell membrane.
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