Biopolymers 20, 12471260. Thermal compaction of disordered and elastin-like polypeptides: a temperature-dependent, sequence-specific coarse-grained simulation model. doi: 10.1128/mcb.26.5.1700-1709.2006, Mecham, R. P. (1991). Transient tropoelastin nanoparticles are early-stage intermediates in the coacervation of human tropoelastin whose aggregation is facilitated by heparan sulfate and heparin decasaccharides. Acad. Allergan to acquire University of Sydney spinoff Elastagen Co-author Professor Anthony Weiss from the Charles Perkins Centre and Faculty of Science explained: "Tropoelastin can repair the heart because it is a precise replica of the body's natural elastic protein,". Tropoelastins hydrophobic domains are predominantly responsible for the random coil content of the monomer, and are the result of the unique pairing of proline and glycine pairs that are interspersed throughout the majority of hydrophobic domains (Rauscher and Pomes, 2017). 26, 125135. Tropoelastin is characterised by alternating hydrophobic and hydrophilic domains and is highly flexible. eLife 6:e26526. Biochemistry 45, 99899996. Acta 303, 363369. I thank my team at the University of Sydney and greatly look forward to seeing our science commercialized by Allergan.. Chem. Transglutaminase-mediated cross-linking of tropoelastin to fibrillin stabilises the elastin precursor prior to elastic fibre assembly. doi: 10.1016/j.matbio.2007.05.005, He, D., Miao, M., Sitarz, E. E., Muiznieks, L. D., Reichheld, S., Stahl, R. J., et al. Micron 41, 268272. Perturbation of either of these components greatly reduces tropoelastins ability to self-assemble in vitro and interact with the microfibril scaffold of elastic fibers (Nonaka et al., 2014), indicating that an intact domain 36 is required for correct assembly. The study is designed to evaluate the efficacy of two formulations of a cross-linked tropoelastin matrix given the product codes ELAPR002f (collectively referred to as ELAPR or ELAPR002) for the treatment of rolling atrophic acne scars when administered as intradermal implants. The conserved C-terminus is an area of the molecule of particular biological importance in that it is required for both incorporation into elastin and for cellular interactions. Characterization of an unusual tropoelastin with truncated C-terminus in the frog. Fazio, M. J., Olsen, D. R., Kuivaniemi, H., Chu, M. L., Davidson, J. M., Rosenbloom, J., et al. Integrins canonically bind proteins containing Arg-Glu-Asp motifs, but this sequence is not found in tropoelastin (Lee et al., 2014). (2001). Together, we build bridges, power ideas, act fast and drive results for our customers and patients around the world by always doing what is right. Dermatol. Novel Recombinant Tropoelastin Implants Restore Skin Extracellular Matrix Biol. Cross-linking domains are capable of modulating self-assembly when incorporated into peptides and biomaterials derived from tropoelastins hydrophobic domains. doi: 10.1126/sciadv.1501145, Yeo, G. C., and Weiss, A. S. (2019). [Epub ahead of print]. Elastagens revolutionary technology is based on recombinant human tropoelastin, the precursor of elastin which is a key component of youthful skin. Domains in tropoelastin that mediate elastin deposition in vitro and in vivo. Single nucleotide polymorphisms and domain/splice variants modulate assembly and elastomeric properties of human elastin. Synthesis and properties of crosslinked recombinant pro-resilin. (1987). Proc. doi: 10.1111/iep.12224, Kentsis, A., and Sosnick, T. R. (1998). The smallest amino acid, glycine is known to promote flexibility within local structures due to lack of steric hindrance, whereas prolines restrictive sidechain inhibits conformational sampling and disrupts the formation of prolonged secondary structures (Roberts et al., 2015). 252, 351365. The elastin receptor complex: a unique matricellular receptor with high anti-tumoral potential. The SAXS/SANS global shape of tropoelastin (Baldock et al., 2011) has been used to validate the full-atomistic computational model of tropoelastin through a geometric and topological comparison (Tarakanova et al., 2018). Nature 246, 461466. J. Med. J. Biol. U.S.A. 112, E4408E4415. However, higher resolution data were required to map out its elusive properties and performance within a hierarchical assembly (Tarakanova et al., 2018; Ozsvar et al., 2019). Biochemistry of tropoelastin. Elastic fibers provide tissues with mechanical resilience, durability, and cell interactivity, which support a diverse range of specialized functionality. Biochemistry 37, 1461314622. 10, 15321541. Am. This suggests the ERCs primary signal pathways are involved in wound recognition through fragments of elastin, where EDPs are formed as a result of elastic tissue damage. Chem. 13, 739743. doi: 10.1016/s0003-9861(02)00719-1, Muiznieks, L. D., Reichheld, S. E., Sitarz, E. E., Miao, M., and Keeley, F. W. (2015). Proline-poor hydrophobic domains modulate the assembly and material properties of polymeric elastin. Tropoelastin is a precursor protein of elastin, and is composed of hydrophilic (lysine, valine and proline) and hydrophobic (glycine, valine and proline) domains. Meanwhile, modifications to the full-atomistic model have revealed the mechanisms that contribute to aberrant fiber structure (Tarakanova et al., 2018) that have been hypothesized to predispose patients to diseases such as acquired cutis laxa (Hu et al., 2006). (2019). Biomacromolecules 21, 35233538. doi: 10.1021/acs.biomac.8b01503, Rauscher, S., Baud, S., Miao, M., Keeley, F. W., and Poms, R. (2006). Proline and glycine control protein self-organization into elastomeric or amyloid fibrils. Front. J. Biol. Biomed. Biol. 293, 1510715119. IRVING, Texas (AP) IRVING, Texas (AP) Fluor Corp. (FLR) on Tuesday reported fourth-quarter net income of $9 million, after reporting a loss in the same period a year earlier. Dominant driving factors of assembly were examined, including water, temperature and domain pair orientations. doi: 10.1021/bi0610092, Cordier, P., Tournilhac, F., Souli-Ziakovic, C., and Leibler, L. (2008). (2017). The majority of tropoelastin synthesis occurs during perinatal development (Myers et al., 1983; Noguchi et al., 1990), however, synthesis may be triggered in response to tissue damage (Parks et al., 1992) or during diseases such as atherosclerosis (Phinikaridou et al., 2018). DEERFIELD, IL - Caterpillar Inc. (NYSE: CAT) today announced it will move its global headquarters to the company's existing office in Irving, Texas, from its current location in Deerfield, Illinois. Soluble matrix protein is a potent modulator of mesenchymal stem cell performance. J. Biol. Tropoelastin is frequently described in the literature as an unstructured protein, mainly because models of elasticity invoke an element of disorder within the structure (4, 9, 10).While this concept appears to be the case at the fine, more subtle intramolecular level, chaos alone is unlikely to explain the ordered assembly of tropoelastin which culminates in the formation of organized . doi: 10.1016/j.matbio.2006.09.011, Miao, M., Reichheld, S. E., Muiznieks, L. D., Huang, Y., and Keeley, F. W. (2013). Lab. This content is for members only. Remodelling the extracellular matrix in development and disease. doi: 10.1016/0005-2795(73)90368-1, Franzblau, C., Faris, B., and Papaioannou, R. (1969). Molecular model of human tropoelastin and implications of associated mutations. Indeed, studies examining the consequences of domain insertions and deletions note changes in the intrinsic functionality of tropoelastin, corroborating the hypothesis that domain insertions and deletions result in altered tissue mechanics (Jensen et al., 2000; Kozel et al., 2003; Yeo et al., 2016; Miao et al., 2017). Total synthesis and expression in Escherichia coli of a gene encoding human tropoelastin. Macromol. The most commonly investigated isoform contains domain 26A and lacks domain 22, and is predominantly found in elastic tissues (Indik et al., 1987; Vrhovski et al., 1997). FEBS Lett. Matrix Biol. doi: 10.1248/bpb.b13-00933, Ozsvar, J., Tarakanova, A., Wang, R., Buehler, M. J., and Weiss, A. S. (2019). doi: 10.1002/bip.23007, Miao, M., Stahl, R. J., Petersen, L. F., Reintsch, W. E., Davis, E. C., and Keeley, F. W. (2009). Coarse-grained model of tropoelastin self-assembly into nascent fibrils. (2005). A comprehensive map of human elastin cross-linking during elastogenesis. The Wellcome Trust Centre for Cell-Matrix Research is supported by funding from Wellcome Trust (203128/Z/16/Z). Targeted modulation of tropoelastin structure and assembly. This suggests a high level of conformational sampling during this phase of coacervation, indicating that the flexibility of tropoelastin plays a key role in assembly that may persist, to some extent, into later stages of assembly (Reichheld et al., 2020). 280, 4093940947. Our Juvederm collection of fillers has sales of over $1 billion globally and is one of the fastest growing parts of our Aesthetics business, said Bill Meury, Chief Commercial Officer at Allergan. Future investigations will allow the bridging of the gap between mesoscale simulations and microscopically observed coacervation (Clarke et al., 2006). 2:e1501145. Tropoelastin massively associates during coacervation to form quantized protein spheres. Integrin alpha v beta 3 binds a unique non-RGD site near the C-terminus of human tropoelastin. Natl. doi: 10.1073/pnas.1111615108, Yeo, G. C., Baldock, C., Wise, S. G., and Weiss, A. S. (2017). Variations in the relative abundance of alternatively spliced ELN mRNA transcripts have been observed between tissues, and this diversity is thought to be necessary for the fine tuning of the mechanical characteristics of tissues to suit their unique functional requirements (Reichheld et al., 2019). Comparative genomics of elastin: sequence analysis of a highly repetitive protein. Allergan announced that it would be accessing Elastagen's next generation Juvederm dermal filler injectable portfolio, which will now also boast its "key 'youth protein' tropoelastin". doi: 10.1016/j.biochi.2004.03.002, Sandberg, L. B., Gray, W. R., Foster, J. Sci. doi: 10.1021/bi034837t, Tamburro, A. M., Guantieri, V., and Gordini, D. D. (1992). Closer to the base of the molecule, the flexible hinge region between domains 21 and 23 presented with a scissors-like bending, which is now believed to contribute to elasticity and multimeric assembly through enhanced conformational space sampling (Tarakanova et al., 2019b). 624, 137146. doi: 10.1016/j.jmb.2020.08.023, Luan, C. H., Harris, R., Prasad, K. U., and Urry, D. W. (1990). Specific instructions are found in the Directions for Use. (2016). (2014). Elastogenic cells, such as fibroblasts (Mecham et al., 1985) and smooth muscle cells (Narayanan et al., 1976), synthesize and secrete tropoelastin. Further down the molecule, the cell-interactive C-terminus was noted to be highly flexible, indicating that high conformational sampling could be conducive to tropoelastins interactions between cell-surface receptors and elastic fiber-associated proteins. Tropoelastin undergoes minimal energy loss during extension, similar to other polymers such as rubber and resilin (Elvin et al., 2005; Cordier et al., 2008; Baldock et al., 2011). Acta 761, 1722. While the clinical stage tropoelastin platform provides multiple opportunities for aesthetics, scar remodelling and tissue repair, it also has the . It's a stretchy protein that resembles a rubber band it can stretch out (extend) and shrink back (recoil). It's a major component of tissues in your body that require stretchiness, like your lungs, bladder, large blood vessels and some ligaments. ACS Biomater. It has become increasingly evident that tropoelastins sequence, structure and subsequent functionality are in a delicate balance; thus, perturbations to tropoelastins sequence can have far-reaching consequences for self-assembly and the resultant architecture of elastic fibers. Adv. Latent TGF- binding protein 4 promotes elastic fiber assembly by interacting with fibulin-5. J. Biol. (2014). The coacervate is made insoluble by irreversible crosslinking. Additionally, coarse-graining the full-atomistic model has allowed for the examination of mesoscale tropoelastin assembly and, in particular, deciphered the orientation of tropoelastin molecules that occurs during early stage assembly (inset image) (Tarakanova et al., 2019a). Allergan markets a portfolio of leading brands and best-in-class products for the central nervous system, eye care, medical aesthetics and dermatology, gastroenterology, womens health, urology and anti-infectivetherapeutic categories. Coacervation is an endothermic, entropically favorable process through which tropoelastin monomers self-assemble into higher order n-mer structures. 26, 17001709. Although there is no 3D structure for porcine tropoelastin, porcine tropoelastin differs from that of humans (Sandberg et al., 1977), leaving it unclear as to whether these domains align as expected in human tissue. Our understanding of key aspects of the assembly process have been unclear due to the intrinsic properties of elastin and tropoelastin that render them difficult to study. doi: 10.1016/0014-4800(65)90015-8, He, D., Chung, M., Chan, E., Alleyne, T., Ha, K. C. H., Miao, M., et al. Implications for tissue specificity and durability of elastic tissue. 276, 4457544580. For example, their inclusion in peptides derived from hydrophobic domains confers decreased times taken for self-assembly, most likely due to their favorable interaction with aqueous solvent (Miao et al., 2003). 28, 432441. doi: 10.1016/s0022-5320(83)80021-5, Broekelmann, T. J., Kozel, B. Matrix Biol. Advanced BioMatrix - Recombinant Tropoelastin, Lyophilized #5052 Chem. Proc. Coacervation characteristics of recombinant human tropoelastin. The next stage of elastin assembly involves the deposition of tropoelastin spherules onto the microfibril scaffold of elastic fibers. Tropoelastins primary sequence is low in complexity and contains repetitive motifs. doi: 10.1002/bip.22663, Murata, K., and Wolf, M. (2018). Fabricating organized elastin in vascular grafts. Provides infrastructure for further development and following approval to commercialize Elastagens products, SYDNEY February 7th: Elastagen Pty Limited, a clinical stage company developing medical device products based on recombinant tropoelastin, today announced that it has entered into a definitive agreement under which Allergan, a leading global biopharmaceutical company, has agreed to acquire Elastagen for an upfront payment of US$95M plus contingent, commercial payments.. doi: 10.1016/j.jsb.2004.11.005, Muiznieks, L. D., Jensen, S. A., and Weiss, A. S. (2003). It was first hypothesized that tropoelastin assembles in a head-to-tail manner similar to that of other ECM proteins such as collagen, which assembles into fibrils that subsequently associate laterally to form sheets and thicker fibers (Kadler, 2017). Multimers may undergo further transitions, such as branching, to form spherules made of multimer aggregates (Tu et al., 2010). Differential expression of two tropoelastin genes in zebrafish. J. Biol. It has been postulated that the interaction between tropoelastin and cell surface proteoglycans is part of the assembly process of elastin before it is deposited on microfibrils. Calorim. This reflects the experimentally observed heterogeneity of cross-links in mature elastin, again giving weight to the hypothesis that the flexibility of tropoelastin is imperative for assembly (Schrader et al., 2018; Tarakanova et al., 2019a). J. Biochem. Stem cell growth accelerated by tropoelastin protein For Elastagen contact: Robert Daniels, CEO +61 2 9209 4054. Biol. Domains 12 to 16 of tropoelastin promote cell attachment and spreading doi: 10.1002/chem.200305661. Biopolymers [Epub ahead of print]. Partridge, S. M. (1966). Elastagens tropoelastin is identical to that present in human tissue, and has many potential clinical applications, including treatment for acne scars, stretch marks, aesthetic skin repair and surgical wound repair. Biomacromolecules 20, 11781189. Med. Molecular modeling of protein materials: case study of elastin. 41, 494497. Package Size. doi: 10.1007/978-3-319-71530-8_13-1, Wen, Q., Mithieux, S. M., and Weiss, A. S. (2020). 87, 18281834. CICADA TURNS 20: How synthetic skin biotech Elastagen changed lives This model revealed that tropoelastin maintains a canonical or average structure based on the distribution of its possible conformations in spite of its flexible nature (Figure 2), as well as the possible roles that local structures play in biological processes, specifically, elastogenesis (Tarakanova et al., 2019b). J. 15, 786801. doi: 10.1002/jcp.20546, Kozel, B. doi: 10.1016/j.jsb.2005.02.005, Martin, S. L., Vrhovski, B., and Weiss, A. S. (1995). Synthesis and structural studies of a pentapeptide sequence of elastin. Sci. Elastin as a random-network elastomer: a mechanical and optical analysis of single elastin fibers. Lysinonorleucine. Biomacromolecules 18, 599609. Earnings, adjusted for non-recurring costs, came . Coacervation of tropoelastin. J. Struct. Scientists find way to heal scars left behind by heart attacks Unlike hydrophobic domains, cross-linking domains in isolation are unable to self-assemble; thus, they have been studied in the context of the cross-linking of elastin-derived biomaterials (Annabi et al., 2017; Yue et al., 2017). LOX and LOXL convert the -amino group of lysine to -aminoadipic acid -semialdehyde (allysine) (Schmelzer et al., 2019), which spontaneously undergo either a Schiff base reaction with a lysine, or two allysines crosslink through aldol condensation, to give rise to bifunctional crosslinks (Franzblau et al., 1969; Lent et al., 1969). (1995). The narrow specificity to v3 and 53 may also be beneficial compared with other ECM adhesion molecules such as fibronectin (which can adhere to up to 20 types of integrin) which may compete with and modulate binding to tropoelastin, and deliver opposing effects on cell proliferation. doi: 10.1016/j.matbio.2008.02.006, Phinikaridou, A., Lacerda, S., Lavin, B., Andia, M. E., Smith, A., Saha, P., et al. Bochicchio, B., Yeo, G. C., Lee, P., Emul, D., Pepe, A., Laezza, A., et al. Inflammatory destruction of elastic fibers in acquired cutis laxa is associated with missense alleles in the elastin and fibulin-5 genes. The elasticity of organs and tissues in vertebrates is due to the presence of elastin, and an insoluble protein whose soluble monomer, tropoelastin, is enzymatically cross-linked through -amino groups of lysine residues. Genet. EBP plays two roles in the assembly of elastin. More recently, the computational model of tropoelastin has been leveraged to characterize higher-order structures and probe self-assembly (Tarakanova et al., 2019a). Sequence and structure determinants for the self-aggregation of recombinant polypeptides modeled after human elastin. Background: Elastin is an essential component of the dermis, providing skin with elasticity and integrity. In order to eliminate this limitation, human tropoelastin has been expressed in a recombinant bacterial system and the protein has been highly purified. Instead, tropoelastin domains 1418 and 36 (RKRK sequence) have been found to bind to both integrins. (1983). Tropoelastin aggregates at physiological temperature due to interactions between hydrophobic domains in a process called coacervation. 396, 870873. Chem. Interestingly, the location and orientation of different domains that contacted each other during self-assembly was noted to be heterogeneous, resulting in head-to-head, tail-to-tail, head-to-tail, and lateral interactions (Tarakanova et al., 2019a). 58, 270277. Biosynthesis and nature of elastin structures. A., Starcher, B. C., and Urry, D. W. (1974). doi: 10.1111/j.1749-6632.1991.tb17013.x, Mecham, R. P., Levy, B. D., Morris, S. L., Madaras, J. G., and Wrenn, D. S. (1985). Biol. (2013). The hydrophobic domains vary in length, with the majority of the shorter (95 residues) domains occurring near the N-terminus, while the longer (up to 55 residues) domains are found within tropoelastins central and C-terminal regions (Indik et al., 1989). Free energy determinants of secondary structure formation: I. alpha-Helices. Molecular dynamics modeling of aggregating tropoelastin-derived peptide chains points to the maintenance of a hydrated, disordered, liquid-like state due to the formation of short-lived inter-chain bonds (Rauscher and Pomes, 2017; Reichheld et al., 2020), mostly likely due to the inducement of random coils by PG repeats (vide supra).
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