Biomaterial Database

Dynamics of Co-translational Membrane Protein Integration and Translocation via the Sec Translocon. 2020

Michiel J M Niesen, and Matthew H Zimmer, and Thomas F Miller

Department of Chemistry & Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.

An important aspect of cellular function is the correct targeting and delivery of newly synthesized proteins. Central to this task is the machinery of the Sec translocon, a transmembrane channel that is involved in both the translocation of nascent proteins across cell membranes and the integration of proteins into the membrane. Considerable experimental and computational effort has focused on the Sec translocon and its role in nascent protein biosynthesis, including the correct folding and expression of integral membrane proteins. However, the use of molecular simulation methods to explore Sec-facilitated protein biosynthesis is hindered by the large system sizes and long (i.e., minute) time scales involved. In this work, we describe the development and application of a coarse-grained simulation approach that addresses these challenges and allows for direct comparison with both in vivo and in vitro experiments. The method reproduces a wide range of experimental observations, providing new insights into the underlying molecular mechanisms, predictions for new experiments, and a strategy for the rational enhancement of membrane protein expression levels.

UI	MeSH Term	Description	Entries
D002462	Cell Membrane	The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells.	Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D000069816	SEC Translocation Channels	Universally conserved multiprotein complexes that form the protein transport channel of the general secretory (SEC) pathway. The SEC translocase is present in all bacteria, archaea, and eukaryotes. It is in the ENDOPLASMIC RETICULUM membrane of eukaryotic cells, in the THYLAKOID MEMBRANE in CHLOROPLASTS and in some protozoa in the INNER MITOCHONDRIAL MEMBRANE.	SEC Translocation Channel,SEC Translocon,SEC61 Translocation Channel,Sec Protein Translocation System,SecYEG Protein,SecYEG Translocation Channel,SEC Complexes,SEC Translocase,SEC Translocons,SEC61 Protein,SEC61 Proteins,SEC61 Translocase,SEC61 Translocation Channels,SEC61 Translocon,Sec Protein Translocation Systems,Sec61 Complex,Sec61 Protein Translocation System,SecY Translocase,SecYEG Complex,SecYEG Complexes,SecYEG Protein Translocation System,SecYEG Proteins,SecYEG Translocation Channels,SecYEG Translocon,Channel, SEC Translocation,Channel, SEC61 Translocation,Channel, SecYEG Translocation,Channels, SEC Translocation,Channels, SEC61 Translocation,Channels, SecYEG Translocation,Complex, Sec61,Complex, SecYEG,Complexes, SEC,Complexes, SecYEG,Protein, SEC61,Protein, SecYEG,Proteins, SEC61,Proteins, SecYEG,Translocase, SEC,Translocase, SEC61,Translocase, SecY,Translocation Channel, SEC,Translocation Channel, SEC61,Translocation Channel, SecYEG,Translocation Channels, SEC,Translocation Channels, SEC61,Translocation Channels, SecYEG,Translocon, SEC,Translocon, SEC61,Translocon, SecYEG,Translocons, SEC
D000595	Amino Acid Sequence	The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.	Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D014176	Protein Biosynthesis	The biosynthesis of PEPTIDES and PROTEINS on RIBOSOMES, directed by MESSENGER RNA, via TRANSFER RNA that is charged with standard proteinogenic AMINO ACIDS.	Genetic Translation,Peptide Biosynthesis, Ribosomal,Protein Translation,Translation, Genetic,Protein Biosynthesis, Ribosomal,Protein Synthesis, Ribosomal,Ribosomal Peptide Biosynthesis,mRNA Translation,Biosynthesis, Protein,Biosynthesis, Ribosomal Peptide,Biosynthesis, Ribosomal Protein,Genetic Translations,Ribosomal Protein Biosynthesis,Ribosomal Protein Synthesis,Synthesis, Ribosomal Protein,Translation, Protein,Translation, mRNA,mRNA Translations
D056004	Molecular Dynamics Simulation	A computer simulation developed to study the motion of molecules over a period of time.	Molecular Dynamics Simulations,Molecular Dynamics,Dynamic, Molecular,Dynamics Simulation, Molecular,Dynamics Simulations, Molecular,Dynamics, Molecular,Molecular Dynamic,Simulation, Molecular Dynamics,Simulations, Molecular Dynamics