| 单词 |
murein |
| 释义 |
murein Biochem.|ˈmjʊəriːn|
[f. L. mūr-us wall + -ein, after protein.]
A polymeric substance whose molecules consist of mucopolysaccharide chains interlinked with short peptide chains and which is an important structural component of the cell walls of many bacteria.
1964Weidel & Pelzer in Adv. Enzymol. XXVI. 195 The new type of polymer from which bacterial sacculi are tailored. We propose the term ‘murein’.., in analogy to the trivial name ‘protein’. Various other designations presently in use, like ‘mucocomplex’ or ‘mucopolymer’, have little to recommend them because they would fit a variety of chemically rather different structures. The term ‘mucopeptide’ which has also been proposed, appears to be somewhat misleading for a polymer which is..at least as much a polysaccharide as it is a (poly)peptide. 1969W. G. Murrell in Gould & Hurst Bacterial Spore vii. 236 All spore mureins so far studied..differ from known cell wall polymers in having..a two- to three-fold excess of glucosamine or muramic acid residues over glutamic acid or DAP residues. 1969New Scientist 10 July 64/1 Murein contains an amino sugar, muramic acid, which is not found in higher organisms, and also several amino acids in the unusual D-configuration. 1972Nature 3 Mar. 10/1 The bacterial cell wall is bounded by a fragile cytoplasmic membrane... This is surrounded by, or interwoven with, a more rigid cell wall..built up from a limited number of constituents and known variously as mucopeptide, peptidoglycan or murein. |
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单词 mure 释义 ▪ I. † mure, n. Obs.[a. F. mur:—L. mrum (mrus).]1. A wall. Also transf. ......