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Fatty acid synthase is a multi-enzyme protein that catalyzes fatty acid synthesis. It is not a single enzyme but a whole enzymatic system composed of two identical 272 kDa multifunctional polypeptides , in which substrates are handed from one functional domain to the next.
Synthesis of saturated fatty acids via fatty acid synthase II in E. coli. Straight-chain fatty acid synthesis occurs via the six recurring reactions shown below, until the 16-carbon palmitic acid is produced. [2] [3] The diagrams presented show how fatty acids are synthesized in microorganisms and list the enzymes found in Escherichia coli. [2]
Fatty-acyl-CoA synthase, or more commonly known as yeast fatty acid synthase (and not to be confused with long chain fatty acyl-CoA synthetase), is an enzyme complex responsible for fatty acid biosynthesis, and is of Type I Fatty Acid Synthesis (FAS). Yeast fatty acid synthase plays a pivotal role in fatty acid synthesis.
The most common enzymes in this family are 3-ketoacyl-CoA synthases, fatty acid elongases and very long-chain fatty acid condensing enzymes. The most common general characterization for these enzymes is E.C. 2.3.1.-; however, some are defined as 2.3.1.119. Most enzymes in the KS2 family catalyze reactions to produce very long-chain fatty acids.
Three types of acyl-CoA synthases are employed, depending on the chain length of the fatty acid. [3] For example, the substrates for medium chain acyl-CoA synthase are 4-11 carbon fatty acids. [4] The enzyme acyl-CoA thioesterase takes of the acyl-CoA to form a free fatty acid and coenzyme A. [4]
In molecular biology, Beta-ketoacyl-ACP synthase EC 2.3.1.41, is an enzyme involved in fatty acid synthesis.It typically uses malonyl-CoA as a carbon source to elongate ACP-bound acyl species, resulting in the formation of ACP-bound β-ketoacyl species such as acetoacetyl-ACP.
Fatty acid synthesis occurs in the cytoplasm of cells while oxidative degradation occurs in the mitochondria. Many of the enzymes for the fatty acid synthesis are organized into a multienzyme complex called fatty acid synthase. [5] The major sites of fatty acid synthesis are adipose tissue and the liver. [6]
The long chain fatty acyl-CoA ligase (or synthetase) is an enzyme (EC 6.2.1.3) of the ligase family that activates the oxidation of complex fatty acids. [2] Long chain fatty acyl-CoA synthetase catalyzes the formation of fatty acyl-CoA by a two-step process proceeding through an adenylated intermediate. [3]