| tropoelastin | A salt-soluble precursor of elastin. Lysyl oxidase is instrumental in converting it to elastin in connective tissue. (12 Dec 1998) |
|---|---|
| tropological | Characterised by tropes; varied by tropes; tropical. Tropolog"ically. Origin: Gr., cf. F. Tropologique. See Tropology. Source: Websters Dictionary (01 Mar 1998) |
| tropology | <study> A rhetorical mode of speech, including tropes, or changes from the original import of the word. Origin: Gr.; a trope + discourse: cf. F. Tropologie. Source: Websters Dictionary (01 Mar 1998) |
| tropolone | <chemical> 2-hydroxy-2,4,6-cycloheptatrien-1-one. Chemical name: 2,4,6-Cycloheptatrien-1-one, 2-hydroxy- (12 Dec 1998) |
| tropometer | Any instrument for measuring the degree of rotation or torsion, as of the eyeball or the shaft of a long bone. Origin: G. Trope, a turning, + metron, measure (05 Mar 2000) |
| tropomodulin | <protein> Tropomyosin binding protein that weakens tropomyosin actin interaction. Found in erythrocyte membrane skeleton and in various nonerythroid cells. Kreis & Vale 1993 (18 Nov 1997) |
| tropomyosin | <protein> Protein (66 kD) associated with actin filaments both in cytoplasm and (in association with troponin) in the thin filament of striated muscle. Composed of two elongated _ helical chains (each about 33 kD), 40 nm long, 2 nm diameter. Each chain has six or seven similar domains and interacts with as many G actin molecules as there are domains. Not only does the binding of tropomyosin stabilise the F actin, but the association with troponin in striated muscle is important in control by calcium ions. (18 Nov 1997) |
| tropomyosin kinase | <enzyme> From chick embryo; requires mg; ca and cyclic AMP not needed Registry number: EC 2.7.1.132 (26 Jun 1999) |
| troponin | <protein> Complex of three proteins, Troponins C, I, & T, associated with tropomyosin and actin on the thin filament of striated muscle, upon which it confers calcium sensitivity. There is one troponin complex per tropomyosin. Troponin C (18 kD) binds calcium ions reversibly, has a variable number of EF hand motifs and is the least variable of the subunits. TnC binds TnI & TnT, but not actin. Troponin I (23 kD) binds to actin and at 1:1 stoichiometry can inhibit the actin myosin interaction on its own. Troponin T (37 kD) binds strongly to tropomyosin. (18 Nov 1997) |
| troponin c | One of the three polypeptide chains that make up the troponin complex. It is a calcium-binding protein. (12 Dec 1998) |
| troponin I | One of the three polypeptide chains that make up the troponin complex. It is an inhibitory protein that binds to actin. (12 Dec 1998) |
| troponin phosphatase | <enzyme> Dephosphorylates serine 20-phosphate of the inhibitor subunit tn-1, of cardiac troponin Registry number: EC 3.1.3.- (26 Jun 1999) |