Structural analysis of purified beta‐adrenergic receptors
作者:
Claire M. Fraser,
Anthony R. Kerlavage,
Andrew P. Mariani,
J. Craig Venter,
期刊:
Proteins: Structure, Function, and Bioinformatics
(WILEY Available online 1987)
卷期:
Volume 2,
issue 1
页码: 34-41
ISSN:0887-3585
年代: 1987
DOI:10.1002/prot.340020105
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: adrenergic receptors;affinity chromatography;electron microscopy;oligomeric structure;target size analysis;HPLC digest mapping;receptor evolution
数据来源: WILEY
摘要:
AbstractWe have characterized the structure of purified beta‐adrenergic receptors by a combination of photoaffinity labeling, high performance liquid chromatography (HPLC)‐tryptic mapping, CNBr fragmentation, target size analysis, and electron microscopy of purified receptor molecules. Guinea pig lung beta‐adrenergic receptors purified by affinity chromatography, ion exchange chromatography, and HPLC size exclusion chromatography or photoaffinity labeled with[125]‐iodocyanopindolol diazirine displayed mobilities on sodium dodecyl sulfate‐polyacrylamide gel electrophoresis (SDS‐PAGE) that corresponded to Mr= 68,000. Purified, radioiodinated guinea pig lung beta‐receptors were subjected to complete trypsin digestion and subsequent reverse‐phase HPLC analysis, which revealed nine peptides. Active site labeling and tryptic digestion of partially purified hamster lung beta‐receptors produced one peptide, whereas CNBr digestion of the same material produced two labeled fragments, yielding information about the location of the active site within the primary sequence. Purified guinea pig lung receptors were examined with transmission electron microscopy. Electron micrographs revealed slightly asymmetric, rod‐shaped structures with an average length of 13 nm and width of 3.4 nm. Many receptors were arranged as apparent dimeric structures. These findings confirm data obtained from target size analysis of guinea pig lung beta‐receptors in situ which suggest that receptors may exist as oligomeric arrays in the native membrane. Taken together, these data provide information about putative functional domains of the beta‐adrenergic receptor and i
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