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Isolation and chara...
Isolation and characterization of the major gel proteins in human semen, semenogelin I and semenogelin II
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- Malm, Johan (author)
- Lund University,Lunds universitet,Klinisk kemi, Malmö,Forskargrupper vid Lunds universitet,Clinical Protein Science and Imaging,Clinical Chemistry, Malmö,Lund University Research Groups,Skåne University Hospital
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- Hellman, Jukka (author)
- University of Turku
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- Magnusson, Helena (author)
- Skåne University Hospital
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- Laurell, Carl Bertil (author)
- Lund University,Lunds universitet,Klinisk kemi, Malmö,Forskargrupper vid Lunds universitet,Clinical Chemistry, Malmö,Lund University Research Groups,Skåne University Hospital
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- Lilja, Hans (author)
- Lund University,Lunds universitet,Klinisk kemi, Malmö,Forskargrupper vid Lunds universitet,Clinical Chemistry, Malmö,Lund University Research Groups,Skåne University Hospital
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(creator_code:org_t)
- Wiley, 1996
- 1996
- English.
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In: European Journal of Biochemistry. - : Wiley. - 0014-2956 .- 1432-1033. ; 238:1, s. 48-53
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Abstract
Subject headings
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- Semenogelin I and semenogelin II constitute the major gel-forming proteins in human semen. The gel proteins were rapidly solubilized and separated from spermatozoa in ejaculates collected at pH 9.7 in buffer containing 4 mol/l urea and dithiothreitol. This protected the semenogelins from proteolytic degradation by prostate-specific antigen, and allowed their isolation by affinity chromatograph:g on heparin-sepharose. Semenogelins I and II were almost selectively retained and eluted partially separated in 0.25 mol/l NaCl. Further purification was achieved by chromatography on Superose. Approximately 10-20 mg semenogelin I and 2-5 mg semenogelin II were recovered from each sample with a purity exceeding 95% as judged by SDS/PAGE. The molecular mass of semenogelin I (49,958 Da) and the major form of semenogelin II (63,539 Da) measured by mass spectrometry was consistent with the reported cDNA data. The occurrence of a second, larger form of semenogelin II was due to asparagine-linked glycosylation. The amino-termini of the purified proteins were blocked, but digestion with pyroglutamate aminopeptidase enabled the identification of amino-terminal sequences consistent with the reported cDNA data. The amino acid compositions of the purified proteins were also consistent with those derived from cDNA data. The absorption coefficients (280 nm, 1%, 1 cm) for semenoaelins I and II. were 5.5 and 5.4, respectively, and the isoelectric point was above pH 9.5 for both proteins.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Läkemedelskemi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Medicinal Chemistry (hsv//eng)
Keyword
- Semenogelin
- Seminal coagulum
- Seminal plasma
- Seminal vesicle
Publication and Content Type
- art (subject category)
- ref (subject category)
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