Cardiac troponin T forms a tetramer in vitro.

Abstract:

:Cardiac troponin T (cTnT) is a myofibrillar protein essential for calcium-dependent contraction. This property has led to functional studies of developmentally expressed cTnT isoforms and mutants identified in patients with hypertrophic cardiomyopathy. The release of cTnT into the serum following myocardial infarction has led to the development of antibody-based assays for measuring cTnT serum concentration. We examined the behavior of cTnT in solution. Recombinant human cTnT3, the dominant isoform in the adult human heart, was used. The protein was pure and functional, as demonstrated by SDS-PAGE and surface plasmon resonance. cTnT3 was found to bind specifically and in a concentration-dependent manner to cTnC. Routine size exclusion chromatography suggested a higher-than-expected MW for cTnT. Using analytical ultracentrifugation, we found cTnT3 in solution to be mainly in the form of a tightly bound tetramer at concentrations as low as 4 micromol/L. Our sedimentation velocity and transmission electron microscopy results indicate that the tetramer's shape is elongated rather than globular. CTnT's self-association in solution is an important consideration in the design and interpretation of experiments with the aim of understanding the biochemical and biophysical properties of cTnT, its isoforms, and its mutants.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Lounes KC,Demeler B,Anderson DE,Gomes AW,Potter JD,Nassar R,Anderson PA

doi

10.1021/bi7012596

subject

Has Abstract

pub_date

2008-02-19 00:00:00

pages

1970-6

issue

7

eissn

0006-2960

issn

1520-4995

journal_volume

47

pub_type

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