title: The small, methionine-rich chloroplast heat-shock protein protects photosystem II electron transport during heat stress.
abstract: Evidence suggests that the small chloroplast heat-shock protein (Hsp) is involved in plant thermotolerance but its site of action is unknown. Functional disruption of this Hsp using anti-Hsp antibodies or addition of purified Hsp to chloroplasts indicated that (a) this Hsp protects thermolabile photosystem II and, consequently, whole-chain electron transport during heat stress; and (b) this Hsp completely accounted for heat acclimation of electron transport in pre-heat-stressed plants. Therefore, this Hsp is a major adaptation to acute heat stress in plants.
authors.affiliation: Department of Biology, Syracuse University, New York 13244-1220, USA. heckathorns@cofc.edu
authors.forename: S A
authors.initials: SA
authors.lastname: Heckathorn
authors.forename: C A
authors.initials: CA
authors.lastname: Downs
authors.forename: T D
authors.initials: TD
authors.lastname: Sharkey
authors.forename: J S
authors.initials: JS
authors.lastname: Coleman
mesh_terms: D000064:Acclimatization; D002736:Chloroplasts / Q000502:physiology*; D004579:Electron Transport; D006360:Heat-Shock Proteins / Q000096:biosynthesis / Q000302:isolation & purification / Q000502:physiology*; D006358:Hot Temperature; D018551:Solanum lycopersicum / Q000502:physiology*; D008715:Methionine; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism*; D045332:Photosystem II Protein Complex; D013997:Time Factors
chemical_list: D006360:Heat-Shock Proteins; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D008715:Methionine