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(Received for publication, December 31, 1996, and in revised form, January 10, 1997)
From the Biocenter and Department of Biochemistry, University of
Oulu, FIN-90570 Oulu, Finland
We report the isolation and characterization of
cDNA clones for a novel isoform of lysyl hydroxylase (lysyl
hydroxylase 2), a posttranslational enzyme of collagen biosynthesis.
The open reading frame predicted a protein of 737 amino acids,
including an amino-terminal signal peptide. The amino acid sequence has overall similarity of over 75% to the lysyl hydroxylase (lysyl hydroxylase 1) characterized earlier. This similarity is even higher in
the carboxyl-terminal end of the molecules. Lysyl hydroxylase 2 contains nine cysteine residues, which are conserved in lysyl hydroxylase 1. Furthermore, the conserved histidines and aspartate residues required for lysyl hydroxylase activity are present in the
sequence. Northern analysis identified a transcript of 4.2 kilobases,
which was highly expressed in pancreas and muscle tissues. Expression
of cDNA in insect cells using a baculovirus vector yielded proteins
with lysyl hydroxylase activity and an antiserum against a synthetic
peptide of the deduced amino acid sequence recognized proteins with
molecular weights of 88 and 97 kDa in homogenates of the transfected
cells.
Volume 272, Number 11,
Issue of March 14, 1997
pp. 6831-6834
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
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