问题描述：
英语翻译
The complete covalent structure is tailed the primary structure (V structure).It must include a specification of the configuration of all asymmetric centers* both in the polymer chain backbone and on the side chains of each of the monomer residues.
The primary structure of hundreds of proteins and nucleic acids has been determined by elaborate chemical analysis.An up-to-date compilation of all known primary structures is published regularly.It would be extremely time-consuming to write a chemical formula for the entire primary structure.Therefore,it is customary to abbreviate prima-ry structures by using an alphabetic code.The most common version of this,(shown be-low) uses a one-letter code for each nucleotide and a three-letter code for each amino acid.The terms sequence and primary structure are often used interchangeably and,in fact,they are identical for all single-chain non-crosslinked structures.Note that neither term implies knowledge of the conformation of any individual residues or the polymer back-bone.
Type Example Abbreviation
Polystyrene >CH2 CHPh CH; CHPh CH2 CHPh >
Polyamide —>NH— (Cttr)*—NH—CO- (CH,)„ CO-NH— (CH.V-NH— CO—>
Polypeptide —>NH—CH(CH3>—CO—NH—CH—CO—NH—CH(H)—CO—>
-Ala—Ser—GlyPolysaccharide —NAG-NAM-NAG
Polynucleotide ApUpC
1,Secondary structure describes helices of residues
Many biopolymer chains can form locally ordered,three-dimensional structures.For in-dividual,linear,head-to-tail polymers,with asymmetric monomer units,the only kind of symmetric three-dimensional ordered structure possible is a helix.This contains a screw axis of symmetry.
Other helices can be formed by bringing together two or more individual helical strands.Double and triple helices are fairly common in nature.In multiple-stranded helices,the indi-vidual covalent chains can run in parallel directions,but it is also possible to construct he-lices in which some strands run in apposite directions.The Watson-Crick DNA double-heli-cal structure is a 10-fold C10 residues per turn) double helix with antiparallel strands.Polypeptide £) sheets are multistranded twofold helices in which some neighboring strands run parallel whereas others run antiparallel.
The secondary structure (2° structure) of a biopolymer is defined as an enumeration of the particular regions of the primary structure involved in any kind of helix.More generally,secondary structure is a list of all three dimensional regions that have ordered,locally sym metric backbone structures.
The complete covalent structure is tailed the primary structure (V structure).It must include a specification of the configuration of all asymmetric centers* both in the polymer chain backbone and on the side chains of each of the monomer residues.
The primary structure of hundreds of proteins and nucleic acids has been determined by elaborate chemical analysis.An up-to-date compilation of all known primary structures is published regularly.It would be extremely time-consuming to write a chemical formula for the entire primary structure.Therefore,it is customary to abbreviate prima-ry structures by using an alphabetic code.The most common version of this,(shown be-low) uses a one-letter code for each nucleotide and a three-letter code for each amino acid.The terms sequence and primary structure are often used interchangeably and,in fact,they are identical for all single-chain non-crosslinked structures.Note that neither term implies knowledge of the conformation of any individual residues or the polymer back-bone.
Type Example Abbreviation
Polystyrene >CH2 CHPh CH; CHPh CH2 CHPh >
Polyamide —>NH— (Cttr)*—NH—CO- (CH,)„ CO-NH— (CH.V-NH— CO—>
Polypeptide —>NH—CH(CH3>—CO—NH—CH—CO—NH—CH(H)—CO—>
-Ala—Ser—GlyPolysaccharide —NAG-NAM-NAG
Polynucleotide ApUpC
1,Secondary structure describes helices of residues
Many biopolymer chains can form locally ordered,three-dimensional structures.For in-dividual,linear,head-to-tail polymers,with asymmetric monomer units,the only kind of symmetric three-dimensional ordered structure possible is a helix.This contains a screw axis of symmetry.
Other helices can be formed by bringing together two or more individual helical strands.Double and triple helices are fairly common in nature.In multiple-stranded helices,the indi-vidual covalent chains can run in parallel directions,but it is also possible to construct he-lices in which some strands run in apposite directions.The Watson-Crick DNA double-heli-cal structure is a 10-fold C10 residues per turn) double helix with antiparallel strands.Polypeptide £) sheets are multistranded twofold helices in which some neighboring strands run parallel whereas others run antiparallel.
The secondary structure (2° structure) of a biopolymer is defined as an enumeration of the particular regions of the primary structure involved in any kind of helix.More generally,secondary structure is a list of all three dimensional regions that have ordered,locally sym metric backbone structures.
问题解答：
我来补答展开全文阅读