Polypeptide Chain
Polypeptide Chain - Related Videos
09:42
Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides
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Cited by 6 •
2012
We describe here a technique that is now routinely used to isolate stably bound ribosome nascent chain complexes (RNCs). This technique takes advantage of the discovery that a 17 amino acid long SecM "arrest sequence" can halt translation elongation in a prokaryotic (E. coli) system, when inserted into (or fused to the C-terminus) of virtually any protein.
10:15
Isolation of Ribosome Bound Nascent Polypeptides in vitro to Identify Translational Pause Sites Along mRNA
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Cited by 2 •
2012
A technique to identify translational pause sites on mRNA is described. This procedure is based on isolation of nascent polypeptides accumulating on ribosomes during in vitro translation of a target mRNA, followed by the size analysis of the nascent chains using a denaturing gel electrophoresis.
07:35
Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli
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Cited by 48 •
2014
Elastin-like polypeptides are stimulus-responsive biopolymers with applications ranging from recombinant protein purification to drug delivery. This protocol describes the purification and characterization of elastin-like polypeptides and their peptide or protein fusions from Escherichia coli using their lower critical solution temperature phase transition behavior as a simple alternative to chromatography.
01:28
Electron Transport Chains
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2019
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle. The ETC is comprised of...
01:31
Supply Chain and Supply Chain Management
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2025
Individuals, organizations, resources, activities, and technology are all involved in creating and selling a product. The process typically begins with sourcing raw materials from suppliers, progresses through manufacturing to produce finished goods, continues with warehousing, and culminates in distribution to consumers. Supply Chain Management, or SCM oversees the seamless flow of goods, information, and finances across these stages, aiming to optimize costs, manage inventory levels...
FAQs
The amino acid sequence provides the molecular information that guides how a polypeptide chain folds and what it can do. Because sequence affects the resulting three-dimensional structure, it also influences protein stability, activity, and cellular role. Researchers therefore examine sequence changes when studying enzymes, receptors, inherited disorders, or efforts to engineer proteins with selected properties.
The amino terminus and carboxyl terminus establish the two ends of a polypeptide chain and provide an organized way to describe its sequence. This orientation helps connect the chain’s structure with its production during translation, in which amino acids are joined according to messenger RNA information. Considering both termini supports accurate analysis of chain organization and protein structure.
After amino acids are joined, chemical interactions within the chain can promote folding into a functional three-dimensional structure. That structure helps determine whether the resulting protein remains stable, performs an activity, or serves a particular cellular role. Studying this relationship between interactions, folding, and function is central to understanding protein behavior and developing engineered or therapeutic proteins.
Translation converts information carried by messenger RNA into an ordered amino acid chain. Ribosomes use the messenger RNA sequence as the specification and join amino acids through peptide bonds as the chain extends. The resulting sequence then provides the framework for folding and function, linking gene expression at the RNA level with the properties of the protein product.
The main components identified in this process are messenger RNA, ribosomes, and amino acids. Messenger RNA supplies the sequence information, while the ribosome joins the selected amino acids through peptide bonds. Together, these components connect genetic information with production of a polypeptide chain, making the process useful for studying how cells express genes and produce proteins.
Polypeptide chains provide a foundation for investigating proteins involved in enzymes, receptors, inherited disorders, and other cellular roles. Their sequences and folding patterns can help researchers relate molecular structure to stability or activity. The same knowledge supports protein engineering and therapeutic development, where understanding chain properties can guide efforts to study or modify biologically important proteins.