Spontaneous dimensional reduction and ground state degeneracy in a simple chain model.
| Autor: | Škrbić T; Department of Physics and Institute for Fundamental Science, University of Oregon, Eugene, Oregon 97403, USA and Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia, Campus Scientifico, Edificio Alfa, via Torino 155, 30170 Venezia Mestre, Italy., Hoang TX; Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi 11108, Vietnam., Giacometti A; Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia, Campus Scientifico, Edificio Alfa, via Torino 155, 30170 Venezia Mestre, Italy and European Center for Living Technologies (ECLT), Ca' Bottacin, Dorsoduro 3911 Calle Crosera, 30123 Venezia, Italy., Maritan A; Dipartimento di Fisica e Astronomia, Università di Padova and INFN, via Marzolo 8, 35131 Padova, Italy., Banavar JR; Department of Physics and Institute for Fundamental Science, University of Oregon, Eugene, Oregon 97403, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review. E [Phys Rev E] 2021 Jul; Vol. 104 (1), pp. L012101. |
| DOI: | 10.1103/PhysRevE.104.L012101 |
| Abstrakt: | Chain molecules play a key role in the polymer field and in living cells. Our focus is on a new homopolymer model of a linear chain molecule subject to an attractive self-interaction promoting compactness. We analyze the model using simple analytic arguments complemented by extensive computer simulations. We find several striking results: there is a first-order transition from a high-temperature random coil phase to a highly unusual low-temperature phase; the modular ground states exhibit significant degeneracy; the ground state structures exhibit spontaneous dimensional reduction and have a two-layer structure; and the ground states are assembled from secondary motifs of helices and strands connected by tight loops. We discuss the similarities and notable differences between the ground state structures [we call these PoSSuM (Planar Structures with Secondary Motifs)] in the phase and protein native state structures. |
| Databáze: | MEDLINE |
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