Semenogelin, the predominant protein in human semen. Primary structure and identification of closely related proteins in the male accessory sex glands and on the spermatozoa

• The predominant protein in human semen, semenogelin, was characterized by lambda gt11 clones isolated from a seminal vesicular cDNA library. One clone, carrying a cDNA insert of 1606 nucleotides and a polyadenylated tail, coded for the entire semenogelin precursor. An open reading frame of 1386 nucleotides encodes a signal peptide and the mature protein of 439 amino acid residues, in which residues 85-136 are identical with a previously characterized semenogelin fragment. The polypeptide chain displays a most conspicuous region of internal sequence homology where 46 of the 58 amino acid residues at positions 259-316 are repeated at positions 319-376. An abundant seminal vesicular transcript of 1.8 kilobases (kb) codes for semenogelin. Two additional transcripts, one seminal vesicular 2.2-kb species and one epididymal 2.0-kb species, code for related proteins that have a close structural relationship as well as antigenic epitopes in common with semenogelin. Semenogelin and the semenogelin-related proteins are the major proteins involved in the gelatinous entrapment of ejaculated spermatozoa. Antigenic epitopes common to these proteins are localized to the parts of the spermatozoa involved in locomotion. The spermatozoa become progressively motile as the gel-forming proteins are fragmented by the kallikrein-like protease, prostate-specific antigen, and the gel dissolves.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Urologi och njurmedicin (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Urology and Nephrology (hsv//eng)

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Läkemedelskemi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Medicinal Chemistry (hsv//eng)

Nyckelord

Molecular Sequence Data

Male

Immunohistochemistry

Humans

Gonadal Steroid Hormones/*analysis/genetics

Male/*analysis

Genitalia

DNA/analysis

Amino Acid Sequence

Base Sequence

Research Support

Non-U.S. Gov't

Semen/*analysis

*Seminal Vesicle Secretory Proteins

Spermatozoa/*analysis

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)