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Long before the time of genome sequencing, Bob Tabita was among the first to realize that microorganisms harbor many more, very diverse forms of RubisCO than those found in higher plants. In fact, Bob’s seminal studies opened our eyes to a fascinating biochemically and evolutionary diverse universe of nature’s most abundant and keystone enzyme. He discovered type II RubisCOs in Proteobacteria, type III RubisCOs in Archaea and later even RubisCO-like proteins, termed type IV RubisCOs, demonstrating that this enzyme has a rich evolutionary history that dates back long before the beginning of photosynthesis.
Being a trained biochemist, Bob Tabita was not afraid to adopt the methods of molecular biology, which allowed him to decipher the complex regulatory network controlling the expression and regulation of RubisCO in purple non-sulfur bacteria and, lead to the discovery of the role of the CBB cycle in redox-balancing and the formation of hydrogen gas by nitrogenase in the absence of RubisCO [8]. He also established heterologous expression systems that enabled the community to study the catalytic properties of different RubisCOs, just to learn that the great phylogenetic diversity of RubisCOs is paralleled by an unexpected biochemical diversity.
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Justin A North,Adrienne B Narrowe,Weili Xiong,Kathryn M Byerly,Guanqi Zhao, Sarah J Young, Srividya Murali,John A Wildenthal,William R Cannon,Kelly C Wrighton,Robert L Hettich,F Robert Tabita
Phaedra J Thomas, Amanda J Boller,Sriram Satagopan,F Robert Tabita,Colleen M Cavanaugh,Kathleen M Scott
Photosynthesis Researchno. 2 (2017): 117-131
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