| 词条 | Geoffrey Chang |
| 释义 |
In 2007, Chang and coauthors retracted five previously published papers describing the structures of three multidrug transporter proteins after another research group published a widely differing structure, which led to the discovery of a critical bug in the Chang group's custom software tools.[4] Since that time, however, Chang has published other papers in the field of structural biology,[5][6] and has been awarded a EUREKA grant, "for exceptionally innovative research projects that could have an extraordinarily significant impact on many areas of science," from the National Institutes of Health.[7] Retracted papersChang and coauthors published papers on the structures of multidrug resistance transporters known as EmrE, and MsbA. Although the initial structures were widely considered puzzling in the field due to their unexpected placement of their ATP binding sites in the assembled dimer,[8] the publication of an additional structure in the same protein family indicated that the Chang structures were unlikely to represent the biologically active conformation of the molecules.[9] Chang and coauthors issued retractions of their structural papers on EmrE, and MsbA, citing an error in an internal software utility as the source of the data misinterpretation that led to the appearance of wrongly assembled dimers.[4][10] The application of a popular protein structure validation tool to one of the retracted MsbA structures results in scores that indicate severe errors in this structure.[11] The following papers were retracted in 2007:[10][12]
The episode has been referenced in both the scientific[13] and popular media[14] as a case study motivating improved software engineering practices in computational biology. Recent workIn 2009, Chang published a paper in Science,[5] describing a protein that keeps certain substances, including many drugs, out of cells. The protein, called P-glycoprotein or P-gp for short, is one of the main reasons cancer cells are resistant to chemotherapy drugs.[15] In 2010, he led a study published in Nature detailing the structure of the MATE (Multi antimicrobial extrusion protein) family transporter NorM, which belongs to a member of the only remaining class of multidrug resistance transporters left to be described by scientists.[6] The work has implications for combating dangerous antibiotic resistant strains of bacteria, as well as for developing hardy strains of agricultural crops.[16] References1. ^{{cite web |title=Geoffrey Chang |url=http://www.beckman-foundation.org/beckman-young-investigators/geoffrey-chang |website=Arnold and Mabel Beckman Foundation |accessdate=1 August 2018}} 2. ^The Scripps Research Institute News and Views. In Brief 1(9): 2 Apr 2001. Access date 17 Jan 2001. 3. ^{{cite news|last1=Robbins|first1=Gary|url=http://www.utsandiego.com/news/2012/oct/09/scripps-research-loses-fifth-talented-scientist/|title=Scripps Research Loses Fifth Talented Scientist|accessdate=10 February 2015|work=San Diego Union-Tribune|date=9 Oct 2012}} 4. ^1 Miller G. (2006). Scientific publishing. A scientist's nightmare: software problem leads to five retractions. Science 314(5807):1856-7. {{PMID|17185570}} 5. ^1 Aller S. et al. (2009). Structure of P-Glycoprotein Reveals a Molecular Basis for Poly-Specific Drug Binding. Science 323 (5922): 1718 - 1722. http://www.sciencemag.org/cgi/content/abstract/323/5922/1718 6. ^1 He et al., "Structure of a Cation‐bound Multidrug and Toxic Compound Extrusion Transporter," http://www.nature.com/nature/journal/vaop/ncurrent/abs/nature09408.html 7. ^Scripps Research Institute Geoffrey Chang Wins EUREKA Award http://www.scripps.edu/newsandviews/e_20100920/etc.html 8. ^Higgins CF, Linton KJ. (2001). Structural biology. The xyz of ABC transporters. Science 293(5536):1782-4. {{PMID|11546861}} 9. ^Dawson RJ, Locher KP. (2006). Structure of a bacterial multidrug ABC transporter. Nature 443(7108):180-5. {{PMID|16943773}} 10. ^1 Chang G, Roth CB, Reyes CL, Pornillos O, Chen YJ, Chen AP. (2006). Retraction. Science 314(5807):1875 {{PMID|17185584}} 11. ^Wiederstein M, Sippl MJ. (2007). ProSA-web: interactive web service for the recognition of errors in three-dimensional structures of proteins. Nucleic Acids Res, {{doi|10.1093/nar/gkm290}}. {{PMID|17517781}} 12. ^Gawrylewski A. (2006). Retractions unsettle structural bio: Recent findings upend conclusions from five highly-cited papers The Scientist 4 Jan 2007 Free full text Access date 17 Jan 2007. 13. ^{{cite journal|last1=Perkel|first1=Jeffrey M.|title=Coding your way out of a problem|journal=Nature Methods|date=29 June 2011|volume=8|issue=7|pages=541–543|doi=10.1038/nmeth.1631|pmid=21716280}} 14. ^{{cite news|last1=Tenner|first1=Edward|title=Buggy Software: Achilles Heel of Big-Data-Powered Science?|url=https://www.theatlantic.com/technology/archive/2012/12/buggy-software-achilles-heel-of-big-data-powered-science/265690/|accessdate=10 February 2015|work=The Atlantic|date=7 December 2012}} 15. ^Scientists Find Structure of a Protein that Makes Cancer Cells Resistant to Chemotherapy http://www.scripps.edu/newsandviews/e_20090330/chang.html 16. ^The Scripps Research Institute http://www.scripps.edu/news/press/20100922 External links
5 : Living people|University of California, San Diego faculty|Year of birth missing (living people)|21st-century American biologists|Place of birth missing (living people) |
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