Dong Wang 2026-11-05
Dong Wang is a researcher in structural biology studying transcription and its relationship to DNA repair. His work combines structural and biochemical methods to investigate how molecular machines copy genetic information and respond to damage.[ref]
Dong Wang research profile at UC San Diego. Overview and Stanford structural-biology training
A 2006 study by Dong Wang and collaborators examined structures of actively transcribing RNA polymerase II. The RNA polymerase trigger loop adopted a closed arrangement beneath a correctly positioned nucleoside triphosphate, contacting its base, sugar and phosphates. These observations suggested how recognition of the correct substrate could be coupled to formation of a new phosphodiester bond.[ref]
For example, recognizing only the nucleobase would leave an incomplete explanation of substrate choice: contacts with the sugar and phosphates also help position the incoming molecule. The structural comparison supplies specific interactions to test experimentally. A set of structures samples molecular arrangements; it does not by itself provide a frame-by-frame movie of the reaction.
Dong Wang
. Photo explicitly identified on the UC San Diego institutional profile for the transcription and DNA-repair researcher. RNA polymerase trigger loop 2026-11-05
The RNA polymerase trigger loop is a mobile protein element near the active site of multisubunit RNA polymerase. In RNA polymerase II, it can close beneath a correctly positioned incoming nucleoside triphosphate and form contacts with its base, sugar and phosphate groups. Its movement links recognition of the substrate with efficient phosphodiester bond formation during transcription.[ref]
Structural basis of transcription: role of the trigger loop in substrate specificity and catalysis by Dong Wang and others. Abstract and Figures 1–2: substrate contacts and alternative loop conformations
The 2006 structural study compared transcribing complexes with different bound nucleotides. A correct substrate in the addition site was associated with a closed conformation and an extensive interaction network. This gave a physical explanation for why merely entering the active-site region is not sufficient for efficient incorporation: the substrate must also support a productive arrangement of the surrounding polymerase.[ref]
Structural basis of transcription: role of the trigger loop in substrate specificity and catalysis by Dong Wang and others. Figures 1–2, addition/entry-site nucleotide complexes and trigger-loop positions
For an illuminating comparison, imagine two nucleotides that bind detectably but support loop closure with different probabilities. Equal binding abundance would not imply equal incorporation rates, because productive positioning contributes a further step. This is a schematic kinetic argument, not a measurement of a particular pair of rate constants.
The adjacent RNA polymerase bridge helix and the RNA polymerase trigger loop are distinct structural elements. A proposed catalytic role for a loop residue must also be distinguished from what is directly observed in a crystal: geometry can suggest a chemical mechanism, while mutagenesis and kinetics test its consequences.