peptide bond (redirected from Peptide group)

bond (bond) the linkage between atoms or radicals of a chemical compound, or the mark indicating the number and attachment of the valences of an atom in constitutional formulas, represented by a pair of dots or a line between atoms, e.g., H—O—H, H—CtbondC—H or H:O:H, H:C:::C:H.

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coordinate covalent bond  a covalent bond in which one of the bonded atoms furnishes both of the shared electrons.

covalent bond  a chemical bond between two atoms or radicals formed by the sharing of a pair (single bond), two pairs (double bond), or three pairs of electrons (triple bond).

disulfide bond  a strong covalent bond, —S—S—, important in linking polypeptide chains in proteins, the linkage arising as a result of the oxidation of the sulfhydryl (SH) groups of two molecules of cysteine.

high energy bond  a chemical bond the hydrolysis of which yields high levels of free energy; it may involve phosphate (high energy phosphate b.) or sulfur (high energy sulfur b.) or other mixed anhydride types of chemical structure.

hydrogen bond  a weak, primarily electrostatic, bond between a hydrogen atom bound to a highly electronegative element in a given molecule and a second highly electronegative atom in another molecule or elsewhere in the same molecule; it is usually represented by three dots, e.g., X—H···Y.

ionic bond  a chemical bond in which electrons are transferred from one atom to another so that one bears a negative and the other a positive charge, the attraction between these opposite charges forming the bond.

peptide bond  a —CO—NH— linkage formed between the carboxyl group of one amino acid and the amino group of another; it is an amide linkage joining amino acids to form peptides.

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peptide bond

n.

The chemical bond formed between the carboxyl groups and amino groups of neighboring amino acids, constituting the primary linkage of all protein structures.

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bond,

n the force that holds two or more units of matter together.

bond, peptide

n.pl the linking mechanisms that bind together the amino acid building blocks of proteins.

bond, primary,

n a chemical bond that requires some change in structure of matter. Primary bonds are ionic, covalent, or metallic.

bond, secondary,

n a physical bond (sometimes called
van der Waals forces) that involves weak interatomic attractions such as variations in physical mass or location of electrical charge.

bond strength,

n the force with which a sealant holds fast to the surface of a tooth.

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bond

the linkage between atoms or radicals of a chemical compound, or the symbol representing this linkage and indicating the number and attachment of the valencies of an atom in constitutional formulas, e.g. H−O−H, H−C= C−H and can be represented by a pair of dots between atoms, e.g. H:O:H, H:C:::C:H.

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coordinate covalent bond

a covalent bond in which one of the bonded atoms furnishes both of the shared electrons.

covalent bond

a chemical bond between two atoms or radicals formed by the sharing of a pair (single bond), two pairs (double bond) or three pairs of electrons (triple bond).

disulfide bond

a strong covalent bond, −S−S−, important in linking polypeptide chains in proteins, the linkage arising as a result of the oxidation of the sulfhydryl (SH) groups of two molecules of cysteine.

high-energy phosphate bond

an energy-rich phosphate linkage present in adenosine triphosphate (ATP), phosphocreatine and certain other biological molecules. On hydrolysis at pH 7 it yields about 8000 calories per mole, in contrast to the 3000 calories yielded by phosphate esters. The bond stores energy that is used to drive biochemical processes, such as the synthesis of macromolecules, contraction of muscles, and the production of the electrical potentials for nerve conduction.

high-energy sulfur bond

an energy-rich sulfur linkage, the most important of which occurs in the acetyl-CoA molecule, the main source of energy in fatty acid biosynthesis.

human-animal bond

the psychological interdependence between humans and companion animals.

hydrogen bond

a weak, primarily electrostatic, bond between a hydrogen atom bound to a highly electronegative element (such as oxygen or nitrogen) in a given molecule, or part of a molecule, and a second highly electronegative atom in another molecule or in a different part of the same molecule.

ionic bond

a chemical bond in which electrons are transferred from one atom to another so that one bears a positive and the other a negative charge, the attraction between these opposite charges forming the bond.

peptide bond

the −CO−NH− linkage formed between the carboxyl group of one amino acid and the amino group of another; it is an amide linkage joining amino acids to form peptides.

phosphoanhydride bond

a high energy bond present in ATP.

phosphodiester bond

links between nucleotides in nucleic acids.