Quantasome
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (May 2018) |
Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts. They are composed of lipids and proteins that include various photosynthetic pigments and redox carriers. For this reason they are considered to be photosynthetic units. They occur in 2 sizes: the smaller quantasome is thought to represent the site of photosystem I, the larger to represent the site of photosystem II.
Quantasomes were first identified by Roderic B. Park in 1962.[1][2] Each quantasome contains about 230-250 chlorophyll molecules and 50 molecules of carotenoids. Each quantasome forms two pigment systems, PS-I and PS-II, and thus are equipped for photochemical reactions (light reaction) of photosynthesis.[3]
See also
- Light-dependent reactions
- Photophosphorylation
- Photosynthetic reaction centre
- Photosystem II
- Thylakoid
References
- ^ Park, Roderic B. (August 1962). "Advances in photosynthesis". Journal of Chemical Education. 39 (8): 424. Bibcode:1962JChEd..39..424P. doi:10.1021/ed039p424.
- ^ Park, Roderic B.; Biggins, John (May 1964). "Quantasome: Size and Composition". Science. 144 (144): 1009–1011. Bibcode:1964Sci...144.1009P. doi:10.1126/science.144.3621.1009. PMID 17811607. S2CID 20055635.
- ^ Smith, H. (1977). Chapter 4 — Chloroplasts—Structure and Photosynthesis. The Molecular Biology of Plant Cells. University of California Press. ISBN 978-0-520-03465-5. LCCN 77-73503.
- ^ Pearlstein, Robert M. (September 8, 1964). "Quantasome as a Photosynthetic Unit". Science. 145 (3638): 1336. Bibcode:1964Sci...145.1336P. doi:10.1126/science.145.3638.1336. JSTOR 1713904. PMID 17802020.
- ^ Sauer, Kenneth (May 1965). "Molecular Orientation in Quantasomes". Biophysical Journal. 5 (3): 337–348. doi:10.1016/s0006-3495(65)86720-0. PMC 1367739. PMID 19431337.
- ^ Howell, Stephen H.; Moudrianakis, Evangelos N. (September 15, 1967). "Function of the "Quantasome" in Photosynthesis: Structure and Properties of Membrane-Bound Particle Active in the Dark Reactions of Photophosphorylation". Proceedings of the National Academy of Sciences of the United States of America. 58 (3): 1261–1268. Bibcode:1967PNAS...58.1261H. doi:10.1073/pnas.58.3.1261. JSTOR 58108. PMC 335777. PMID 16578666.
- ^ Allaby, Michael (1998). quantasome. A Dictionary of Plant Sciences. Oxford University Press. ISBN 9780198608912. OCLC 70708119.
 | This botany article is a stub. You can help Justapedia by expanding it. |