Widespread control of calcium signaling by a family of SERCA-inhibiting micropeptides

Micropeptides function as master regulators of calcium-dependent signaling in muscle. Sarco/endoplasmic reticulum Ca ATPase (SERCA), the membrane pump that promotes muscle relaxation by taking up Ca into the sarcoplasmic reticulum, is directly inhibited by three muscle-specific micropeptides: myoreg...

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Bibliographic Details
Published in:Science signaling 2016-12, Vol.9 (457), p.ra119-ra119
Main Authors: Anderson, Douglas M, Makarewich, Catherine A, Anderson, Kelly M, Shelton, John M, Bezprozvannaya, Svetlana, Bassel-Duby, Rhonda, Olson, Eric N
Format: Article
Language:English
Subjects:
Animals
Calcium Signaling - drug effects
Calcium-Binding Proteins - chemistry
Calcium-Binding Proteins - pharmacology
Cercopithecus aethiops
COS Cells
Male
Mice
Muscle Proteins - chemistry
Muscle Proteins - pharmacology
Peptides - chemistry
Peptides - pharmacology
Proteolipids - chemistry
Proteolipids - pharmacology
Sarcoplasmic Reticulum Calcium-Transporting ATPases - antagonists & inhibitors
Sarcoplasmic Reticulum Calcium-Transporting ATPases - genetics
Sarcoplasmic Reticulum Calcium-Transporting ATPases - metabolism
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Summary:Micropeptides function as master regulators of calcium-dependent signaling in muscle. Sarco/endoplasmic reticulum Ca ATPase (SERCA), the membrane pump that promotes muscle relaxation by taking up Ca into the sarcoplasmic reticulum, is directly inhibited by three muscle-specific micropeptides: myoregulin (MLN), phospholamban (PLN), and sarcolipin (SLN). The widespread and essential function of SERCA across diverse cell types has raised questions as to how SERCA is regulated in cells that lack MLN, PLN, and SLN. We identified two transmembrane micropeptides, endoregulin (ELN) and another-regulin (ALN), that share key amino acids with their muscle-specific counterparts and function as direct inhibitors of SERCA pump activity. The distribution of transcripts encoding ELN and ALN mirrored that of SERCA isoform-encoding transcripts in nonmuscle cell types. Our findings identify additional members of the SERCA-inhibitory micropeptide family, revealing a conserved mechanism for the control of intracellular Ca dynamics in both muscle and nonmuscle cell types.
ISSN:1945-0877
1937-9145
DOI:10.1126/scisignal.aaj1460