Human N-acetylgalactosamine-4-sulphatase: protein maturation and isolation of genomic clones.
N-Acetylgalactosamine-4-sulphatase (EC 3.1.6.1, G4S) is composed of a 57 kDa species in human liver that dissociates into 43 kDa and 8 kDa subunits under reducing conditions and, when deficient, causes the lysosomal storage disorder, mucopolysaccharidosis type VI. We isolated genomic clones containing the G4S first exon, including the leader peptide and the amino terminus of the 43 kDa polypeptide. Amino-terminal amino acid sequences of the 43 kDa and 8 kDa subunits indicated that the 8 kDa component is linked to the 43 kDa polypeptide by a single disulphide bond, does not contain the mannose-6-phosphate lysosomal targeting signal and is at the carboxyl terminus of G4S.
Department of Chemical Pathology, Adelaide Children's Hospital, S.A., Australia.
T
T
Litjens
C P
CP
Morris
G J
GJ
Gibson
K R
KR
Beckmann
J J
JJ
Hopwood
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004259:DNA-Directed DNA Polymerase / Q000235:genetics; D004721:Endoplasmic Reticulum / Q000201:enzymology; D005091:Exons / Q000235:genetics; D006056:Golgi Apparatus / Q000201:enzymology; D006801:Humans; D008099:Liver / Q000201:enzymology*; D008247:Lysosomes / Q000201:enzymology; D008360:Mannosephosphates; D008969:Molecular Sequence Data; D020051:N-Acetylgalactosamine-4-Sulfatase; D016366:Open Reading Frames; D011499:Protein Processing, Post-Translational; D021382:Protein Sorting Signals / Q000235:genetics; D013429:Sulfatases / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification
D008360:Mannosephosphates; D021382:Protein Sorting Signals; C027693:mannose-6-phosphate; D004259:DNA-Directed DNA Polymerase; D013429:Sulfatases; D020051:N-Acetylgalactosamine-4-Sulfatase