Bicycle-pedal mechanism

{
  "id": "MLC-T-CHM-001210",
  "term": "Bicycle-pedal mechanism",
  "field": "Chemistry",
  "definition": "A volume-conserving mechanism proposed by Warshel for the photoisomerization of conjugated polyenes such as the retinal chromophore of rhodopsin. Two neighboring double bonds twist at the same time while only the two CH units swing out of and back into the molecular plane. The motion resembles turning bicycle pedals and displaces little of the surroundings, which suits confined environments such as protein binding pockets.",
  "synonyms": [
    "BP mechanism"
  ],
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "hula-twist mechanism",
    "photoisomerization"
  ],
  "references": [
    "PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 308 (https://doi.org/10.1351/pac200779030293)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/bicycle-pedal-mechanism/"
}