Team:Northwestern/Project/Chitin Synthesis

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Latest revision as of 20:11, 25 October 2010

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Chitin is an abundant biopolymer found primarily in the exoskeletons of arthropods, including many insects and crustaceans. Composed of N-acetylglucosamine monomers (Figure 1), it functions analogously to keratin in mammalian skin, providing a support matrix for the protective outer surface of these animals. Similarly, most fungi produce chitin in their cell walls for structural support. Chitin production in Saccharomyces cerevisiae depends on a series of enzymatic steps (Figure 2).

Figure 1 Chitin molecular structure.
Source: [http://en.wikipedia.org/wiki/Chitin Wikipedia - Chitin]

One enzyme in this pathway, chitin synthase 3 (CHS3), was previously found to be among the most active chitin sythases in the chitin synthase family of enzymes and does not require additional cofactors to function. As a result, we use CHS3 as the chitin production mechanism in our inducible system ([http://partsregistry.org/Part:BBa_K418007 BBa_K418007]).

Figure 2 Chitin synthesis pathway.
Adapted from Figure 3.1 of Chitin: Fulfilling a Biomaterials Promise by Eugene Khor.

Chitin has many applications, particularly in medicine and industry. Currently, nearly all chitin is obtained from natural sources (i.e. shells of crustaceans). Thus, a method of recombinant chitin production may have commercial applications. Several examples of chitin usage are listed below:

SIGNIFICANCE OF CHITIN:

Medicinal Use:

Wound and burn treatment/healing
Hemostasis for orthopedic treatment of broken bones
Viscoelastic solutions for ophthamology and orthopedic surgery
Abdominal adhesion treatment
Antibacterial and antifungal agents
Tumor therapies
Microsurgery and neurosurgery
Treatment of chronic wounds, ulcers and bleeding (chitin powder)

Industrial Use:

Food/Pharmaceutical/Agricultural/Cosmetic thickener, stabilizer
Agricultural protection
Water resistant properties
Dietary supplement
Water purification
Edible microcrystalline films used to preserve food
Sequestering of particles (i.e. oil)
Biodegradable/non-pollutant

@@ Line 153: / Line 153: @@
 |align="left" valign="top" width="80%" style="padding: 5"|
-Chitin is an abundant biopolymer found primarily in the exoskeletons of arthropods, including many insects and crustaceans. Composed of N-acetylglucosamine monomers (Fig. 1)
-|align="center"|[[image:chitin_wikipedia.png|center|250px]]'''Figure 1''' Chitin molecular structure.
+Chitin is an abundant biopolymer found primarily in the exoskeletons of arthropods, including many insects and crustaceans. Composed of N-acetylglucosamine monomers (Figure 1), it functions analogously to keratin in mammalian skin, providing a support matrix for the protective outer surface of these animals. Similarly, most fungi produce chitin in their cell walls for structural support. Chitin production in Saccharomyces cerevisiae depends on a series of enzymatic steps (Figure 2).[[image:chitin_wikipedia.png|frame|right|alt=alt text|'''Figure 1''' Chitin molecular structure. <br /> Source: [http://en.wikipedia.org/wiki/Chitin  Wikipedia - Chitin]]] <br />
-|align="left" valign="top" width="80%" style="padding: 5"|
+One enzyme in this pathway, chitin synthase 3 (CHS3), was previously found to be among the most active chitin sythases in the chitin synthase family of enzymes and does not require additional cofactors to function. As a result, we use CHS3 as the chitin production mechanism in our inducible system ([http://partsregistry.org/Part:BBa_K418007 BBa_K418007]). [[image:chitin synthesis small.jpg|frame|center|alt=alt text|'''Figure 2''' Chitin synthesis pathway. <br /> Adapted from Figure 3.1 of <u>Chitin: Fulfilling a Biomaterials Promise</u> by Eugene Khor.]]<br />
-- chitin - what is it, how is it used in nature
-- The production of chitin in yeast, pathway, mechanism
-Chitin Synthase 3 (CHS3) was cloned out of Saccharomyces Cerevisiae (S.C.) cDNA.
-CHS3 from S.C. was chosen because the the protein does not require cofactors or activation factors and also because it was determined to be the most active of the Chitin Synthase family.
+Chitin has many applications, particularly in medicine and industry. Currently, nearly all chitin is obtained from natural sources (i.e. shells of crustaceans). Thus, a method of recombinant chitin production may have commercial applications. Several examples of chitin usage are listed below:
-Chitin Synthase polymerizes N-Acetyl-D-Glucosamine, also known as Chitin, with substrate as UDP-N-Acetyl-D-Glucosamine.
+'''SIGNIFICANCE OF CHITIN''':
-|}
+<u>Medicinal Use</u>:
+*Wound and burn treatment/healing
+*Hemostasis for orthopedic treatment of broken bones
+*Viscoelastic solutions for ophthamology and orthopedic surgery
+*Abdominal adhesion treatment
+*Antibacterial and antifungal agents
+*Tumor therapies
+*Microsurgery and neurosurgery
+*Treatment of chronic wounds, ulcers and bleeding (chitin powder)
+<u>Industrial Use</u>:
+*Food/Pharmaceutical/Agricultural/Cosmetic thickener, stabilizer
+*Agricultural protection
+*Water resistant properties
+*Dietary supplement
+*Water purification
+*Edible microcrystalline films used to preserve food
+*Sequestering of particles (i.e. oil)
+*Biodegradable/non-pollutant