Rearrangement of domain elements of the Ca-ATPase in cardiac sarcoplasmic reticulum membranes upon phospholamban phosphorylation.

Abstract:

:Phospholamban (PLB) is a major target of the beta-adrenergic cascade in the heart, and functions to modulate rate-limiting conformational transitions involving the transport activity of the Ca-ATPase. To investigate structural changes within the Ca-ATPase that result from the phosphorylation of PLB by cAMP-dependent protein kinase (PKA), we have covalently bound the long-lived phosphorescent probe erythrosin isothiocyanate (Er-ITC) to cytoplasmic sequences within the Ca-ATPase. Under these labeling conditions, the Ca-ATPase remains catalytically active, indicating that observed changes in rotational dynamics reflect normal conformational transitions. Two major Er-ITC labeling sites were identified using electrospray ionization mass spectrometry (ESI-MS), corresponding to Lys464 and Lys650, which are respectively located within the phosphorylation and nucleotide binding domains of the Ca-ATPase. Frequency-domain phosphorescence measurements of the rotational dynamics of Er-ITC bound to these cytoplasmic sequences within the Ca-ATPase permit the resolution of the dynamic structure of individual domain elements relative to the overall rotational motion of the entire Ca-ATPase polypeptide chain. We observe a significant decrease in the rotational dynamics of Er-ITC bound to the Ca-ATPase upon phosphorylation of PLB by PKA, as evidenced by an increase in the residual anisotropy. These results suggest that phosphorylation of PLB results in a structural reorientation of the phosphorylation or nucleotide binding domains with respect to the membrane normal. In contrast, calcium activation of the Ca-ATPase in the presence of dephosphorylated PLB results in no detectable change in the rotational dynamics of Er-ITC, suggesting that calcium binding and PLB phosphorylation have distinct effects on the conformation of the Ca-ATPase. We suggest that PLB functions to alter the efficiency of phosphoenyzme formation following calcium activation of the Ca-ATPase by modulating the spatial arrangement between ATP bound in the nucleotide binding domain and Asp351 in the phosphorylation domain.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Negash S,Huang S,Squier TC

doi

10.1021/bi990599j

subject

Has Abstract

pub_date

1999-06-22 00:00:00

pages

8150-8

issue

25

eissn

0006-2960

issn

1520-4995

pii

bi990599j

journal_volume

38

pub_type

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