Describe the quaternary structure of hemoglobin The `search_keyword` indicates a focus on the mechanism of `intrachain hydrogen bonding between peptide groups`作者：J Dhar·2016·被引用次数：13—A β-bulgeoccurs betweentwo antiparallel strands such that the extreme NH and COgroups oftwo residues in one strand engage CO and NHofone .... The `serp` results strongly point towards protein secondary structures, specifically the alpha-helix and beta-sheet, as the primary context for this phenomenon. The `Related searches` further reinforce this by mentioning "Intrachain hydrogen bonds in alpha helix" and "Interactions in secondary protein structure." The `Search intent` phrases like "Alpha helices are stabilized by intrachain hydrogen bonds" and "hydrogen bonding between peptide groups" directly align with the core topic.
Therefore, the dominant search intent is to understand how, where, and why intrachain hydrogen bonding occurs between peptide groups within a polypeptide chain, particularly in the context of protein secondary structure stabilizationα helix geometry. ✓ Every mainchainC=O and N-Hgroupishydrogen-bonded to apeptide bond4 residues away (i.e. Oi to Ni+4). This gives a very regular, stable ....
Tier 1:
* `intrachain hydrogen bonding between peptide groups` (search_keyword)
* `peptide group`
* `hydrogen bond`
* `intrachain hydrogen bonds`
* `alpha helix`
* `peptide bond`
* `protein secondary structure`
Tier 2:
* `carbonyl oxygen atoms`
* `amide hydrogen atoms`
* `amino groups`
* `N-H group`
* `C=O group`
* `polypeptide chain`
* `beta sheet`
* `stabilization`
* `conformations`
* `regular, stable`
Tier 3:
* Repetitive or overly generic terms like "of", "between", "occurs", "groups", "chain", "bonds", "hydrogen", "bonding".
* Terms related to primary or tertiary structure unless directly contrasted.
* Commercial or less relevant terms from `Related searches` like "quaternary protein structure", "hemoglobin".
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Intrachain hydrogen bonding between peptide groups is a fundamental molecular interaction that plays a crucial role in defining the three-dimensional architecture of proteins. These specific hydrogen bonds, occurring within a single polypeptide chain, are the primary forces that stabilize recurring structural motifs like the alpha-helix and beta-sheet, collectively known as protein secondary structure.bonds stabilizing protein structure, levels of organization in ... Understanding how these bonds form and their precise locations within the peptide backbone is key to comprehending protein folding and function.
A hydrogen bond is a relatively weak electrostatic attraction that occurs between a hydrogen atom covalently bonded to a highly electronegative atom (like oxygen or nitrogen) and another electronegative atom nearby. In the context of a polypeptide chain, the peptide bond itself contains the necessary components for hydrogen bond formation. Specifically, the carbonyl group (C=O) of one peptide bond acts as a hydrogen bond acceptor (due to the partial negative charge on the oxygen), while the amide group (N-H) of another peptide bond acts as a hydrogen bond donor (due to the partial positive charge on the hydrogen).
When these interactions occur *within* the same polypeptide chain, they are termed intrachain hydrogen bonds.Biochemistry, Tertiary Protein Structure - StatPearls - NCBI - NIH These bonds are not random; their formation is highly specific and dictated by the geometry and proximity of the peptide groups along the chainWhat are proteins.
The alpha-helix is a tightly coiled, rod-like structure that is a hallmark of protein secondary structureresidues, so ,10%ofthe Pro residues in proteins follow a cispeptide bond. Torsion Anglesbetween Peptide GroupsDescribe Polypeptide.ChainConformations. The backbone or mainchain ofa protein refers to the atoms that par- ticipate inpeptide bonds, ignoring the sidechains ofthe amino acid. C. O. N.H. C. O2. N.. Its stability is overwhelmingly due to a regular pattern of intrachain hydrogen bonding. In an alpha-helix, the carbonyl oxygen (C=O) of one amino acid residue forms a hydrogen bond with the amide hydrogen (N-H) of the amino acid residue located four positions further down the polypeptide chain. This means the C=O group of residue 'i' hydrogen bonds with the N-H of residue 'i+4'.Structure Of Proteins | Primary, Secondary Types Summary This specific 'i' to 'i+4' hydrogen bonding pattern creates a stable, helical conformation by pulling the polypeptide backbone into a spiral2022年7月25日—The firstofthese is the primary structure, which is the number and sequenceofamino acids in a protein's polypeptidechainorchains, beginning with the free aminogroupand maintained by thepeptide bondsconnecting each amino acid to the next. The primary structureofinsulin, composedof51 amino .... The side chains of the amino acids project outwards from the helix, minimizing steric hindrance and contributing to the overall stability.
Beta-sheets, also known as beta-pleated sheets, represent another common type of protein secondary structure. Unlike the helical structure, beta-sheets are formed by segments of the polypeptide chain, called beta-strands, lying side-by-side.Hydrogen bondsare shown as dotted lines in the figure, andhydrogen bondingwould make this structure especially stable. The distance separating each turnof... Intrachain hydrogen bonding is also critical here, but the arrangement differs from the alpha-helix. Hydrogen bonds form between the carbonyl oxygen (C=O) of one beta-strand and the amide hydrogen (N-H) of an adjacent beta-strand. These strands can be oriented in the same direction (parallel beta-sheet) or opposite directions (antiparallel beta-sheet). In both cases, a network of hydrogen bonds between the peptide backbones of these strands creates a stable, sheet-like structure with a characteristic pleated appearance.
The collective strength of numerous intrachain hydrogen bonds is substantial, providing the necessary forces to stabilize the specific secondary structures adopted by a polypeptide chain. Without these interactions, proteins would exist as disordered, flexible chains, unable to perform their complex biological functionsWhy do hydrogen bonds between atoms of the polypeptide .... The precise arrangement of hydrogen bonds dictates the formation and stability of alpha-helices and beta-sheets, which then further fold and interact to form the tertiary and quaternary structures of proteins(a) An N-Hgroupinvolved in N-H···N(p z ) interaction with the precedingpeptide group, and also participating in anotherhydrogen bond(taken from the PDB .... Therefore, intrachain hydrogen bonding between peptide groups is not merely an interaction; it is a foundational element that underpins the entire hierarchy of protein structureHydrogen bondsare shown as dotted lines in the figure, andhydrogen bondingwould make this structure especially stable. The distance separating each turnof....
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