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Purification and molecular properties of rabbit lung indolamine N-methyltransferase.

Abstract：

:Indolamine N-methyltransferase (INMT) has been purified to an apparent homogeneity from rabbit lung, and some of its catalytic and physicochemical properties have been examined. The enzyme is a monomeric protein with a molecular weight of 31,500 +/- 1000, a molecular Stokes radius of 21.5 A, and a diffusion coefficient of 8.7 X 10(-7) cm2/s. The frictional ratio of the native enzyme (1.05) suggests that the shape of the molecule is nearly spherical. Denaturation experiments performed with increasing concentrations of guanidine hydrochloride (Gdn-HCl) at neural pH indicated that the active site of the enzyme was destroyed by a structural rearrangement of the protein molecule without large change in its size and shape. The final state reached in 6.0 M Gdn . HCl seemed to correspond to a disulfide cross-linked randomly coiled polypeptide. Full normalization of the fluorescent parameter was attained only in the presence of 0.1 M beta-mercaptoethanol. A structural rearrangement has been observed upon acidification of INMT from pH 7.0 to pH 2.0. At pH 4.5, most of the peptide backbone appeared to be unorganized, but further acidification to pH 2.0 produced a reorganization of protein structure which became able to bind 8-anilino-1-naphthalenesulfonate. The data support the hypothesis that the enzyme structure results from the close package of organized regions joined by structureless segments.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Irace G,Colonna G,Camardella M,Della Pietra G,Porta R

doi

10.1021/bi00535a054

subject

Has Abstract

pub_date

1982-03-16 00:00:00

pages

1464-70

issue

6

eissn

0006-2960

issn

1520-4995

journal_volume

21

pub_type

杂志文章

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