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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
38
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pubmed:dateCreated |
1994-10-28
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pubmed:abstractText |
Peptide mapping, chemical sequencing, microbore HPLC/electrospray ionization mass spectrometry (LC/ESI/MS), and matrix-assisted laser desorption mass spectrometry (MALDI/MS) were used to identify the sites of intra- and intermolecular disulfide linkages in bovine dopamine beta-hydroxylase. The enzyme contains 14 cysteines and seven disulfides per monomer. Edman sequencing of tryptic and peptic peptides determined linkages at positions Cys140-Cys582, Cys218-Cys269, Cys255-Cys281, Cys452-Cys474, Cys514-Cys514, and Cys516-Cys516, where cysteines at positions 514 and 516 on one monomer disulfide pair with their homologs on a second monomer. These linkages were confirmed by LC/ESI/MS and MALDI/MS. Further analysis by LC/ESI/MS and MALDI/MS identified linkages at positions Cys376-Cys489 and Cys380-Cys551. Cysteines 140 and 582 form a disulfide linkage that folds the C-terminus back in proximity to the N-terminus. The remaining intramolecular disulfides occur along two separate internal regions of the protein. The density of histidine residues in these two regions suggests binding sites for two Cu2+ atoms per monomer. In addition, previously identified amino acids that react with mechanism-based inactivators occur in these two regions. We propose that these five internal disulfide bonds define two Cu2+ binding domains that make up the active site of a dopamine beta-hydroxylase monomer. Considering previous data on the location of glycosylation sites, mechanism-based inactivation sites, and the disulfide linkages presented here, the data suggest an overall topology were the N- and C-termini are in close proximity and are solvent exposed and where the Cu2+ binding sites are buried in two interior domains stabilized by five disulfide bonds.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Cysteine,
http://linkedlifedata.com/resource/pubmed/chemical/Disulfides,
http://linkedlifedata.com/resource/pubmed/chemical/Dopamine beta-Hydroxylase,
http://linkedlifedata.com/resource/pubmed/chemical/Peptide Fragments,
http://linkedlifedata.com/resource/pubmed/chemical/Serine Endopeptidases,
http://linkedlifedata.com/resource/pubmed/chemical/Trypsin,
http://linkedlifedata.com/resource/pubmed/chemical/glutamyl endopeptidase
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pubmed:status |
MEDLINE
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pubmed:month |
Sep
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pubmed:issn |
0006-2960
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
27
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pubmed:volume |
33
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
11563-75
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pubmed:dateRevised |
2007-11-14
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pubmed:meshHeading |
pubmed-meshheading:7918370-Amino Acid Sequence,
pubmed-meshheading:7918370-Animals,
pubmed-meshheading:7918370-Cattle,
pubmed-meshheading:7918370-Cysteine,
pubmed-meshheading:7918370-Disulfides,
pubmed-meshheading:7918370-Dopamine beta-Hydroxylase,
pubmed-meshheading:7918370-Mass Spectrometry,
pubmed-meshheading:7918370-Models, Molecular,
pubmed-meshheading:7918370-Molecular Sequence Data,
pubmed-meshheading:7918370-Peptide Fragments,
pubmed-meshheading:7918370-Peptide Mapping,
pubmed-meshheading:7918370-Sequence Analysis,
pubmed-meshheading:7918370-Serine Endopeptidases,
pubmed-meshheading:7918370-Trypsin
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pubmed:year |
1994
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pubmed:articleTitle |
Complete assignment of disulfide bonds in bovine dopamine beta-hydroxylase.
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pubmed:affiliation |
Department of Chemistry, Pennsylvania State University, University Park 16802.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.
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