Cloning and characterization of a novel human ubiquitin-specific protease, a homologue of murine UBP43 (Usp18)

Genomics. 2000 Apr 1;65(1):44-52. doi: 10.1006/geno.2000.6148.


The ubiquitin-specific proteases (UBP) are a family of enzymes that cleave ubiquitin from ubiquitinated protein substrates. We have recently cloned UBP43, a novel member of this family from AML1-ETO knock-in mice. To analyze the role of UBP43 in hematopoiesis and leukemogenesis, we have cloned a full-length human UBP43 cDNA by screening a human monocytic cDNA library as well as by 5'- and 3'-rapid amplification of cDNA ends analyses. This cDNA encodes a polypeptide of 372 amino acids with all of the structural motifs of a deubiquitinating enzyme. The human UBP43 mRNA is strongly expressed in human liver and thymus. Transfection analysis has demonstrated that UBP43 is a nuclear protein. Interestingly, the gene encoding human UBP43 maps to chromosome 22q11.2. This region, known as DiGeorge syndrome critical region, contains a minimal area of 2 Mb and is consistently deleted in DiGeorge syndrome and related disorders. The syndrome is marked by thymic aplasia or hypoplasia, parathyroid hypoplasia, or congenital cardiac abnormalities. Taken together, our results broaden the understanding of a new human ubiquitin-specific protease, UBP43, and suggest that this gene may also be related to DiGeorge syndrome.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Chromosome Mapping
  • Chromosomes, Human, Pair 22 / genetics
  • Cloning, Molecular
  • DNA, Complementary / chemistry
  • DNA, Complementary / genetics
  • DNA, Complementary / isolation & purification
  • Endopeptidases / genetics*
  • Endopeptidases / metabolism
  • Exons
  • Gene Expression
  • Genes / genetics
  • HL-60 Cells
  • HeLa Cells
  • Humans
  • In Situ Hybridization, Fluorescence
  • Introns
  • Jurkat Cells
  • K562 Cells
  • Mice
  • Molecular Sequence Data
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Sequence Alignment
  • Sequence Analysis, DNA
  • Sequence Homology, Amino Acid
  • Tissue Distribution
  • Tumor Cells, Cultured
  • Ubiquitin Thiolesterase
  • Ubiquitin-Specific Proteases
  • Ubiquitins / genetics
  • Ubiquitins / metabolism
  • beta-Galactosidase / genetics
  • beta-Galactosidase / metabolism


  • DNA, Complementary
  • RNA, Messenger
  • Recombinant Fusion Proteins
  • Ubiquitins
  • beta-Galactosidase
  • Endopeptidases
  • Usp18 protein, mouse
  • USP18 protein, human
  • Ubiquitin Thiolesterase
  • Ubiquitin-Specific Proteases

Associated data

  • GENBANK/AJ243526