F-box protein - Misplaced Pages

F-box proteins are proteins containing at least one F-box domain. The first identified F-box protein is one of three components of the SCF complex, which mediates ubiquitination of proteins targeted for degradation by the 26S proteasome.

Core components

F-box domain is a protein structural motif of about 50 amino acids that mediates protein–protein interactions. It has consensus sequence and varies in few positions. It was first identified in cyclin F. The F-box motif of Skp2, consisting of three alpha-helices, interacts directly with the SCF protein Skp1. F-box domains commonly exist in proteins in cancer with other protein–protein interaction motifs such as leucine-rich repeats (illustrated in the Figure) and WD repeats, which are thought to mediate interactions with SCF substrates.

Function

F-box proteins have also been associated with cellular functions such as signal transduction and regulation of the cell cycle. In plants, many F-box proteins are represented in gene networks broadly regulated by microRNA-mediated gene silencing via RNA interference. F-box proteins are involved in many plant vegetative and reproduction growth and development. For example, F-box protein-FOA1 involved in abscisic acid (ABA) signaling to affect the seed germination. ACRE189/ACIF1 can regulate cell death and defense when the pathogen is recognized in the Tobacco and Tomato plant.

In human cells, under high-iron conditions, two iron atoms stabilise the F-Box FBXL5 and then the complex mediates the ubiquitination of IRP2.

Regulation

F-box protein levels can be regulated by different mechanisms. The regulation can occur via protein degradation process and association with SCF complex . For example, in yeast, the F-box protein Met30 can be ubiquitinated in a cullin-dependent manner.

References

Schulman BA, Carrano AC, Jeffrey PD, et al. (November 2000). "Insights into SCF ubiquitin ligases from the structure of the Skp1-Skp2 complex". Nature. 408 (6810): 381–6. Bibcode:2000Natur.408..381S. doi:10.1038/35042620. PMID 11099048. S2CID 4300503.
Bai C, Sen P, Hofmann K, Ma L, Goebl M, Harper JW, Elledge SJ. "SKP1 connects cell cycle regulators to the ubiquitin proteolysis machinery through a novel motif, the F-box". Cell 86 263-74 1996.
Bai C, Sen P, Hofmann K, Ma L, Goebl M, Harper JW, Elledge SJ (July 1996). "SKP1 connects cell cycle regulators to the ubiquitin proteolysis machinery through a novel motif, the F-box". Cell. 86 (2): 263–74. doi:10.1016/S0092-8674(00)80098-7. PMID 8706131.
Kipreos ET, Pagano M (2000). "The F-box protein family". Genome Biol. 1 (5): REVIEWS3002. doi:10.1186/gb-2000-1-5-reviews3002. PMC 138887. PMID 11178263.
Craig KL, Tyers M (1999). "The F-box: a new motif for ubiquitin dependent proteolysis in cell cycle regulation and signal transduction". Prog. Biophys. Mol. Biol. 72 (3): 299–328. doi:10.1016/S0079-6107(99)00010-3. PMID 10581972.
Jones-Rhoades MW, Bartel DP, Bartel B (2006). "MicroRNAS and their regulatory roles in plants". Annu Rev Plant Biol. 57: 19–53. doi:10.1146/annurev.arplant.57.032905.105218. PMID 16669754.
Peng, Juan; Yu, Dashi; Wang, Liqun; Xie, Minmin; Yuan, Congying; Wang, Yu; Tang, Dongying; Zhao, Xiaoying; Liu, Xuanming (June 2012). "Arabidopsis F-box gene FOA1 involved in ABA signaling". Science China Life Sciences. 55 (6): 497–506. doi:10.1007/s11427-012-4332-9. ISSN 1869-1889. PMID 22744179.
Ha, Van Den Burg; Tsitsigiannis, D. I.; Rowland, O; Lo, J; Rallapalli, G; Maclean, D; Takken, F. L.; Jones, J. D. (2008). "The F-box protein ACRE189/ACIF1 regulates cell death and defense responses activated during pathogen recognition in tobacco and tomato". Plant Cell. 20 (3): 697.
Moroishi, T; Nishiyama, M; Takeda, Y; Iwai, K; Nakayama, K. I. (2011). "The FBXL5-IRP2 axis is integral to control of iron metabolism in vivo". Cell Metabolism. 14 (3): 339.
Kaiser, Peter; Su, Ning-Yuan; Yen, James L.; Ouni, Ikram; Flick, Karin (2006-08-08). "The yeast ubiquitin ligase SCFMet30: connecting environmental and intracellular conditions to cell division". Cell Division. 1: 16. doi:10.1186/1747-1028-1-16. ISSN 1747-1028.

External links

F-Box+Proteins at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
F-box+motifs at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

v t e Proteins: carrier proteins
Fatty acid	FABP1 FABP2 FABP3 FABP4 FABP5 FABP6 FABP7
Hormone	peptide hormone: Follistatin Growth hormone binding protein Insulin-like growth factor binding protein IGFBP1 IGFBP2 IGFBP3 IGFBP4 IGFBP5 IGFBP6 IGFBP7 Neurophysins Neurophysin I II steroid hormone: Sex hormone binding globulin/Androgen binding protein Transcortin Thyroxine-binding globulin Transthyretin
Metal/element	calcium Calcium-binding protein Calmodulin-binding proteins copper Ceruloplasmin iron Iron-binding proteins Transferrin receptor
Vitamin	Retinol binding protein 1 2 3 4 Transcobalamin
Pigment	Plant Light-Harvesting Complex Orange Carotenoid Protein Phycobiliprotein Photosynthetic Reaction Centers Phytochrome Rhodopsin
Other	Acyl carrier protein Adaptor protein Cholesterylester transfer protein F-box protein GTP-binding protein Latent TGF-beta binding protein Major urinary proteins Membrane transport protein Odorant binding protein

Categories:

Core components

Function

Regulation

References

Further reading

External links