Abstract
The plant sulfolipid sulfoquinovosyldiacylglycerol was discovered by A.A. Benson in the late 1950s. The increasing availability of radioisotope-containing biological substrates such as 35S-sulfate provided the means to discover novel biological compounds and to sketch out their biosynthetic pathways. During this time the structure of sulfolipid with its 6-deoxy-6-sulfo-α-d-glucose (sulfoquinovose) headgroup was determined. Immediately, the origin of this unusual biological sulfonic acid mystified the scientific community and several proposals for its biosynthesis were developed and tested. Strong supportive evidence for the nucleotide pathway of sulfolipid biosynthesis became available with the discovery of the bacterial and plant genes encoding the enzymes of sulfolipid biosynthesis during the 1990s. This latter work was based on the foundations laid by A.A. Benson and confirmed one initial hypothesis on sulfolipid biosynthesis. An abbreviated summary of the turning points in defining the mechanism for sulfolipid biosynthesis and remaining issues in sulfolipid biochemistry are provided.
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Acknowledgments
I am greatly indebted to Chris Somerville, who set me on the trail of sulfolipid, guided me along the way, and one late night in 1987 made the critical suggestion to use R. sphaeroides as the genetic model. He instilled the confidence in me needed to address this classic problem of plant biochemistry at a time when sulfolipid research had come to a near stop. I am also grateful to the students and postdoctoral researchers in my group that ultimately carried the research on sulfolipid biosynthesis and function to fruition.
Work on plant lipids in the Benning lab is currently supported in parts by grants from the US-National Science Foundation, the US-Department of Energy, BASF-Plant Sciences, the MSU Center of Excellence for the Structural Biology Membrane Proteins, and the Michigan Agricultural Experiment Station.
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Benning, C. Questions remaining in sulfolipid biosynthesis: a historical perspective. Photosynth Res 92, 199–203 (2007). https://doi.org/10.1007/s11120-007-9144-6
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DOI: https://doi.org/10.1007/s11120-007-9144-6