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. 1986 Jul;83(13):4859–4863. doi: 10.1073/pnas.83.13.4859

Human alpha-galactosidase A: nucleotide sequence of a cDNA clone encoding the mature enzyme.

D F Bishop, D H Calhoun, H S Bernstein, P Hantzopoulos, M Quinn, R J Desnick
PMCID: PMC323842  PMID: 3014515

Abstract

The complete nucleotide sequence has been determined for a lambda gt11 cDNA clone (lambda AG18) containing the full-length coding region for the mature lysosomal form of human alpha-galactosidase A (alpha-Gal A; EC 3.2.1.22). The lambda AG18 insert contained a 1226-base-pair sequence with an open reading frame encoding 398 amino acids of the mature polypeptide (predicted Mr = 45,356) and the last 5 amino acids of the propeptide sequence. The poly(A) signals AATACA and ATTAAA occurred 28 and 11 nucleotides prior to the TAA stop codon, respectively. There was no 3' untranslated region as the poly(A) sequence immediately followed the TAA termination codon; a second independently cloned cDNA confirmed this finding. The predicted amino acid sequence was colinear with 86 nonoverlapping residues (22% of the mature subunit) determined by microsequencing amino-terminal, tryptic, and cyanogen bromide peptides of the purified mature enzyme. Four potential N-glycosylation sites were identified, all of which occurred at predicted beta turns in hydrophilic regions of secondary structure. RNA transfer hybridization analysis of HeLa poly(A)+ RNA demonstrated a single 1.45-kilobase band whose signal was decreased by prior immunoabsorption of polysomes with monospecific alpha-Gal A antibodies. Searches of nucleic acid and protein data bases did not reveal significant homology even with the limited sequences available for mammalian lysosomal enzymes.

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Selected References

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