| 单词 | quaternary structure |
| 释义 | > as lemmasquaternary structure quaternary structure n. [compare slightly earlier tertiary adj. 1f] Biochemistry the three-dimensional arrangement and relationships of the subunits which make up a complex protein, nucleoprotein, or other multimeric macromolecule (cf. tertiary structure n. at tertiary adj. 1f). ΚΠ 1958 J. D. Bernal in Discussions Faraday Soc. 25 14 (caption) Hierarchy of polymer complexes:..(d) quaternary structure (homogeneous type), linked groups of tertiary molecules, haemoglobin structure..; (e) quaternary structure (heterogeneous type)—linking of different types of ternary protein and primary ribonuclease, tobacco mosaic virus. 1964 G. H. Haggis et al. Introd. Molecular Biol. iv. 81 The presence of the nucleic acid chain apparently increases the cohesion between sub-units in successive turns of the helical quaternary structure. 1977 Lancet 26 Nov. 1116/1 The four glycoprotein hormones..possess a common quaternary structure characterised by two dissimilar polypeptide chains called the α and β subunits. 1997 J. B. Mitton Select. in Nat. Populations 61 As the number of subunits increases, steric restrictions on the shape of the subunits increase as well... Some biologists..propose that proteins with different quaternary structures would exhibit different levels of genetic variation. < as lemmas |
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