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(cleavage
specificity|hypercholesterolemia|neurogenesis|hepatogenesis)
* Laboratory of Biochemical Neuroendocrinology, Clinical Research
Institute of Montreal, 110 Pine Avenue West, Montreal, QC,
H2W 1R7 Canada; Edited by Donald F. Steiner, University of Chicago, Chicago, IL,
and approved December 5, 2002 (received for review September 10, 2002)
Seven secretory mammalian kexin-like subtilases have been
identified that cleave a variety of precursor proteins at monobasic and
dibasic residues. The recently characterized pyrolysin-like subtilase
SKI-1 cleaves proproteins at nonbasic residues. In this work we
describe the properties of a proteinase K-like subtilase, neural
apoptosis-regulated convertase 1 (NARC-1), representing the
ninth member of the secretory subtilase family. Biosynthetic and
microsequencing analyses of WT and mutant enzyme revealed that human
and mouse pro-NARC-1 are autocatalytically and intramolecularly processed into NARC-1 at the
(Y,I)VV(V,L)(L,M)
Biochemistry
The secretory proprotein convertase neural apoptosis-regulated
convertase 1 (NARC-1): Liver regeneration and
neuronal differentiation
,
,
,
Montreal
Neurological Institute, McGill University, Montreal, QC, H3A 2B4
Canada; and § Regional Protein Chemistry
Center and Diseases of Aging Unit, Ottawa Health Research
Institute, Ottawa Hospital, Civic Campus, 725 Parkdale Avenue, Ottawa,
ON, K1Y 4E9 Canada
motif, a site that is representative of its enzymic specificity.
In vitro peptide processing studies and/or Ala
substitutions of the P1-P5 sites suggested that
hydrophobic/aliphatic residues are more critical at P1, P3, and P5
than at P2 or P4. NARC-1 expression is highest in neuroepithelioma
SK-N-MCIXC, hepatic BRL-3A, and in colon carcinoma LoVo-C5 cell lines.
In situ hybridization and Northern blot analyses of NARC-1
expression during development in the adult and after partial
hepatectomy revealed that it is expressed in cells that have the
capacity to proliferate and differentiate. These include hepatocytes,
kidney mesenchymal cells, intestinal ileum, and colon epithelia as well
as embryonic brain telencephalon neurons. Accordingly, transfection of
NARC-1 in primary cultures of embryonic day 13.5 telencephalon cells
led to enhanced recruitment of undifferentiated neural progenitor cells
into the neuronal lineage, suggesting that NARC-1 is implicated in the
differentiation of cortical neurons.
To whom correspondence should be addressed. E-mail:
seidahn{at}ircm.qc.ca.
www.pnas.org/cgi/doi/10.1073/pnas.0335507100
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