Susan Golden

Source: Wikipedia, the free encyclopedia.
Susan S. Golden
NationalityAmerican
Alma mater
Bioengineering
InstitutionsUniversity of Chicago (1983), Texas A&M University (1986),
UC San Diego Division of Biological Sciences (2008)
Doctoral advisorLouis A. Sherman

Susan Golden (née Stephens) is a Professor of

UC San Diego
.

Golden was born in Pine Bluff, Arkansas in 1957.[1] She attended the local public high school, where she was involved with the marching band and school newspaper. She was accepted to the Mississippi University for Women in 1976 as a journalism major, but soon switched her studies to major in biology and minor in chemistry.

Golden graduated from MUW in two years, after which she was offered a position in the first cohort of trainees in a NIH-financed doctoral program in genetics at the University of Missouri. During her graduate program, Golden met James Golden, a fellow doctoral student.[2] They later married in 1979. At the University of Missouri, Golden researched the protein makeup of the photosynthetic center in cyanobacteria, work she continued when she moved to the University of Chicago in 1983 as a postdoctoral research fellow.[1]

In 1986 Golden accepted a faculty position at Texas A&M to further her investigation into light-dependent gene regulation in bacteria. While at Texas A&M, Golden became interested in studying circadian rhythms after her first encounter with Carl H. Johnson and Takao Kondo, with whom she would go on to discover the Kai complex.[2] Golden was promoted to Distinguished Professor at Texas A&M in 2003, and then moved to UC San Diego in 2008 where she is currently a Distinguished Professor and the Director of the Center for Circadian Biology.[3]

Research contributions

Early work

Golden began her graduate career with Louis A. Sherman, where she used genetics to research the proteins in photosynthetic complexes of the cyanobacteria

night vision scope.[2] The approach was a success, allowing for quantification of cyanobacterial gene expression in vivo over an extended time period. This technique drew the interest of chronobiologist Carl H. Johnson, with whom Golden would go on to collaborate and eventually discover the KaiABC complex .[2]

Discovery of kai complex

Golden studies the

genes in the S. elongatus genome that contribute to circadian rhythm through mutational screens using transposons to disrupt genes and their function. In one mutation screen study, nineteen mutations were identified and mapped to the three kai genes; Inactivation of any single kai gene reduced kaiBC-promoter activity and abolished the circadian rhythm of expression of KaiA and KaiB.[9]

The kai protein circadian system

S. elongatus has a circadian clock with an oscillator based only on three

proteins: KaiA, KaiB, and KaiC. Circadium rhythm is generated based on KaiC phosphorylation and dephosphorylation. Light transmits energy and information to the cyanobacteria, affecting transcriptional regulation of the circadium clock. This 24-hour rhythm can be recreated in vitro with the addition of ATP.[10] The ratio of ATP/ADP fluctuates during the course of the day, and is sensed by KaiC, which phosphorylates or de-phosphorylates based on this signal. This Kai protein system is the simplest post-translational
oscillator known so far.

In photosynthesizing

electrons in the electron transport chain of photosynthesis. Quinones are oxidized in the dark and reduced in the light, and the redox state affects KaiA activity. When quinones are oxidized, KaiA separates from KaiC and binds to them, resetting the clock. Therefore, quinones are essential in transmitting light information to KaiC.[2]

Current research

Metabolic engineering

After moving to UC San Diego in 2008, Susan Golden's research converged with that of her husband, James Golden, to investigate biofuels.[2] She currently researches the potential of utilizing cyanobacteria for industrial production of biofuels. Cyanobacteria are attractive due to simplistic genomes and ability to be genetically modified for industrial efficiency. Their photosynthetic nature may ideally be used to produce sustainably produce biofuels, potentially replacing the need for petroleum and other fossil fuels.[3] They have simple requirements for growth, only requiring sunlight, water, and inorganic trace elements for fast growth. Cyanobacteria are capable of fixing atmospheric carbon (carbon dioxide) into bio-oils and biofuels.[11]

In 2016, Golden and colleagues manually curated a model of metabolism in S. elongatus, indicating the importance of a linear tricarboxylic acid cycle (TCA) metabolic pathway and potential modifications for bio-industrial application.[12]

Honors, awards, and membership

  • National Science Foundation Presidential Young Investigator Award, 1989 - 1995
  • Fellow of the American Academy of Microbiology, elected in 2000
  • Texas A&M Distinguished Professor, 2003
  • Member of the Faculty of 1000 Biology, 2008 - 2015[13]
  • UC San Diego Distinguished Professor and Chancellor’s Associates Chair in Molecular Biology, 2008–present
  • Member of the National Academy of Sciences, elected in 2010[14]
  • Howard Hughes Medical Institute Professor, 2014–present
  • Aschoff and Honma Prize for Biological Rhythm Research, 2018[15]

Selected publications

  • Kondo T, Strayer CA, Kulkarni RD, Taylor W, Ishiura M, Golden SS, Johnson CH (1993). "Circadian rhythms in prokaryotes: luciferase as a reporter of circadian gene expression in cyanobacteria". Proc Natl Acad Sci USA. 90 (12): 5672–6.
    PMID 8516317.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )

References

  1. ^ a b "SQ Online / Faculty Spotlight: Dr. Susan Golden". sqonline.ucsd.edu. December 2013. Retrieved 2017-04-12.
  2. ^
    PMID 23620521
    .
  3. ^ a b c "Susan S. Golden". biology.ucsd.edu. Retrieved 2017-04-12.
  4. PMID 12437876
    .
  5. .
  6. ^ "Susan Golden". www.nasonline.org. Retrieved 2017-04-12.
  7. ISSN 0168-6445
    .
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  13. ^ "Susan Golden | Faculty Member | Faculty Opinions". facultyopinions.com. Retrieved 2022-03-16.
  14. ^ "Susan S. Golden". www.nasonline.org. Retrieved 2022-03-16.
  15. ^ "Susan Golden to Receive International Research Honor". biology.ucsd.edu. Retrieved 2022-03-16.