| Structural highlights
Function
[THIK2_ARATH] Involved in long chain fatty-acid beta-oxidation prior to gluconeogenesis during germination and subsequent seedling growth. Confers sensitivity to 2,4-dichlorophenoxybutiric acid (2,4-DB). Required for local and systemic induction of jasmonic acid (JA) biosynthesis after wounding. Seems to be involved in JA biosynthesis during senescence.[1] [2] [3] [4] [5]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The breakdown of fatty acids, performed by the beta-oxidation cycle, is crucial for plant germination and sustainability. beta-Oxidation involves four enzymatic reactions. The final step, in which a two-carbon unit is cleaved from the fatty acid, is performed by a 3-ketoacyl-CoA thiolase (KAT). The shortened fatty acid may then pass through the cycle again (until reaching acetoacetyl-CoA) or be directed to a different cellular function. Crystal structures of KAT from Arabidopsis thaliana and Helianthus annuus have been solved to 1.5 and 1.8 A resolution, respectively. Their dimeric structures are very similar and exhibit a typical thiolase-like fold; dimer formation and active site conformation appear in an open, active, reduced state. Using an interdisciplinary approach, we confirmed the potential of plant KATs to be regulated by the redox environment in the peroxisome within a physiological range. In addition, co-immunoprecipitation studies suggest an interaction between KAT and the multifunctional protein that is responsible for the preceding two steps in beta-oxidation, which would allow a route for substrate channeling. We suggest a model for this complex based on the bacterial system.
Peroxisomal plant 3-ketoacyl-CoA thiolase structure and activity are regulated by a sensitive redox switch.,Pye VE, Christensen CE, Dyer JH, Arent S, Henriksen A J Biol Chem. 2010 Jul 30;285(31):24078-88. Epub 2010 May 12. PMID:20463027[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Hayashi M, Toriyama K, Kondo M, Nishimura M. 2,4-Dichlorophenoxybutyric acid-resistant mutants of Arabidopsis have defects in glyoxysomal fatty acid beta-oxidation. Plant Cell. 1998 Feb;10(2):183-95. PMID:9490742
- ↑ Germain V, Rylott EL, Larson TR, Sherson SM, Bechtold N, Carde JP, Bryce JH, Graham IA, Smith SM. Requirement for 3-ketoacyl-CoA thiolase-2 in peroxisome development, fatty acid beta-oxidation and breakdown of triacylglycerol in lipid bodies of Arabidopsis seedlings. Plant J. 2001 Oct;28(1):1-12. PMID:11696182
- ↑ He Y, Fukushige H, Hildebrand DF, Gan S. Evidence supporting a role of jasmonic acid in Arabidopsis leaf senescence. Plant Physiol. 2002 Mar;128(3):876-84. PMID:11891244 doi:http://dx.doi.org/10.1104/pp.010843
- ↑ Cruz Castillo M, Martinez C, Buchala A, Metraux JP, Leon J. Gene-specific involvement of beta-oxidation in wound-activated responses in Arabidopsis. Plant Physiol. 2004 May;135(1):85-94. PMID:15141068 doi:http://dx.doi.org/10.1104/pp.104.039925
- ↑ Afitlhile MM, Fukushige H, Nishimura M, Hildebrand DF. A defect in glyoxysomal fatty acid beta-oxidation reduces jasmonic acid accumulation in Arabidopsis. Plant Physiol Biochem. 2005 Jun;43(6):603-9. PMID:15979881 doi:http://dx.doi.org/S0981-9428(05)00126-9
- ↑ Pye VE, Christensen CE, Dyer JH, Arent S, Henriksen A. Peroxisomal plant 3-ketoacyl-CoA thiolase structure and activity are regulated by a sensitive redox switch. J Biol Chem. 2010 Jul 30;285(31):24078-88. Epub 2010 May 12. PMID:20463027 doi:10.1074/jbc.M110.106013
|
