Molecular cloning and nucleotide sequence of cDNA encoding human muscle glycogen debranching enzyme

B. Z. Yang, J. H. Ding, J. J. Enghild, Y. Bao, Y. T. Chen

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


cDNA comprising the entire length of the human muscle glycogen debranching enzyme was cloned and its nucleotide sequence determined. The debrancher mRNA includes a 4545-base pair coding region and a 2371-base pair 3́-nontranslated region. The calculated molecular mass of the debrancher protein derived from cDNA sequence is 172,614 daltons, consistent with the estimated size of purified protein (Mr 165,000 ± 500). A partial amino acid sequence (13 internal tryptic peptides with a total of 213 residues) determined on peptides derived from purified porcine muscle debrancher protein confirmed the identity of the cDNA clone. Comparison of the amino acid sequence predicted from the human glycogen debrancher cDNA with the partial protein sequence of the porcine debrancher revealed a high degree (88%) of interspecies sequence identity. RNA blot analysis showed that debrancher mRNA in human muscle, lymphoblastoid cells, and in porcine muscle are all similar in size (∼7 kilobases). Two patients with inherited debrancher deficiency had a reduced level of debrancher mRNA, whereas two other patients had no detectable abnormality in RNA blots. The isolation of the debrancher cDNA and determination of its primary structure is an important step toward defining the structure-function relationship of this multifunctional enzyme and in understanding the molecular basis of the type III glycogen storage disease.

Original languageEnglish (US)
Pages (from-to)9294-9299
Number of pages6
JournalJournal of Biological Chemistry
Issue number13
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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