Ycf4 protein domain

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Symbol Ycf4
Pfam PF02392
InterPro IPR003359

In molecular biology, the Ycf4 protein is involved in the assembly of the photosystem I complex which is part of an energy-harvesting process named photosynthesis.[1] Without Ycf4, photosynthesis would be inefficient affecting plant growth. Ycf4 is located in the thylakoid membrane of the chloroplast. Ycf4 is important for the light dependent reaction of photosynthesis. To date, three thylakoid proteins involved in the stable accumulation of PSI have been identified, these are as follows:

The Ycf4 protein is firmly associated with the thylakoid membrane, presumably through a transmembrane domain.[1] Ycf4 co-fractionates with a protein complex larger than PSI upon sucrose density gradient centrifugation of solubilised thylakoids.[1]

Ycf is an acronym standing for hypothetical chloroplast open reading frame.


  1. ^ a b c d e Boudreau E, Takahashi Y, Lemieux C, Turmel M, Rochaix JD (October 1997). "The chloroplast ycf3 and ycf4 open reading frames of Chlamydomonas reinhardtii are required for the accumulation of the photosystem I complex". EMBO J. 16 (20): 6095–104. doi:10.1093/emboj/16.20.6095. PMC 1326293Freely accessible. PMID 9321389. 
  2. ^ Bartsevich VV, Pakrasi HB (March 1997). "Molecular identification of a novel protein that regulates biogenesis of photosystem I, a membrane protein complex". J. Biol. Chem. 272 (10): 6382–7. doi:10.1074/jbc.272.10.6382. PMID 9045660. 
  3. ^ Ruf S, Kössel H, Bock R (October 1997). "Targeted inactivation of a tobacco intron-containing open reading frame reveals a novel chloroplast-encoded photosystem I-related gene". J. Cell Biol. 139 (1): 95–102. doi:10.1083/jcb.139.1.95. PMC 2139824Freely accessible. PMID 9314531. 

This article incorporates text from the public domain Pfam and InterPro IPR003359