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2014 ; 289
(23
): 16362-73
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Critical role for NAD glycohydrolase in regulation of erythropoiesis by
hematopoietic stem cells through control of intracellular NAD content
#MMPMID24759100
Nam TS
; Park KH
; Shawl AI
; Kim BJ
; Han MK
; Kim Y
; Moss J
; Kim UH
J Biol Chem
2014[Jun]; 289
(23
): 16362-73
PMID24759100
show ga
NAD glycohydrolases (NADases) catalyze the hydrolysis of NAD to ADP-ribose and
nicotinamide. Although many members of the NADase family, including
ADP-ribosyltransferases, have been cloned and characterized, the structure and
function of NADases with pure hydrolytic activity remain to be elucidated. Here,
we report the structural and functional characterization of a novel NADase from
rabbit reticulocytes. The novel NADase is a glycosylated,
glycosylphosphatidylinositol-anchored cell surface protein exclusively expressed
in reticulocytes. shRNA-mediated knockdown of the NADase in bone marrow cells
resulted in a reduction of erythroid colony formation and an increase in NAD
level. Furthermore, treatment of bone marrow cells with NAD, nicotinamide, or
nicotinamide riboside, which induce an increase in NAD content, resulted in a
significant decrease in erythroid progenitors. These results indicate that the
novel NADase may play a critical role in regulating erythropoiesis of
hematopoietic stem cells by modulating intracellular NAD.