Suberin
Regulation of Suberin Biosynthesis
Suberin
Suberin, a complex polyester biopolymer, is lipophilic, and composed of long chain fatty acids called suberin acids, and glycerol. Suberin is a major constituent of cork, and is named after the cork oak, Quercus suber. Suberin is deposited in the cell walls of the root endodermis and periderm, in seed coats including the chalazal region, at organ abscission zones, and at wound healing sites. The suberin layer functions as an extracellular barrier against uncontrolled water, gas, and ion loss and to protect from pathogen attack and abiotic stresses. Suberin biosynthesis occurs in the ER and the synthesized suberin monomers are transported outside of the plasma membrane through ABC transporter and a glycosylphosphatidylinositol (GPI)-anchored lipid transfer proteins. The exported suberin precursors are polymerized and possibly ligated with the lignins or polysaccharides in the cell wall, but mechanisms underlying the export and polymerization of suberin precursors are still unclear. In particular, it is unclear whether suberin biosynthesis is regulated in seed coat by ABA-dependent manner.
Suberin, a complex polyester biopolymer, is lipophilic, and composed of long chain fatty acids called suberin acids, and glycerol. Suberin is a major constituent of cork, and is named after the cork oak, Quercus suber. Suberin is deposited in the cell walls of the root endodermis and periderm, in seed coats including the chalazal region, at organ abscission zones, and at wound healing sites. The suberin layer functions as an extracellular barrier against uncontrolled water, gas, and ion loss and to protect from pathogen attack and abiotic stresses. Suberin biosynthesis occurs in the ER and the synthesized suberin monomers are transported outside of the plasma membrane through ABC transporter and a glycosylphosphatidylinositol (GPI)-anchored lipid transfer proteins. The exported suberin precursors are polymerized and possibly ligated with the lignins or polysaccharides in the cell wall, but mechanisms underlying the export and polymerization of suberin precursors are still unclear. In particular, it is unclear whether suberin biosynthesis is regulated in seed coat by ABA-dependent manner.
1) Suberin monomer 세포 외 수송 기작: 소포체에서 합성된 suberin monomer는 원형질 막에 존재하는 단백질, ABC transporter, LTPG에 의해 세포 밖으로 나와서 suberin 층을 형성하게 된다. 이러한 suberin monomer의 세포 외 수송 기작에 대해서 현재 연구가 진행되고 있다.
