Nucleic Acids Research, Vol 26, Issue 11 2572-2579, Copyright © 1998 by Oxford University Press
HH Offenberg, JA Schalk, RL Meuwissen, M van Aalderen, HA Kester, AJ Dietrich and C Heyting
In the axial elements of synaptonemal complexes (SCs) of the rat, major
protein components have been identified, with relative electrophoretic
mobilities (M rs) of 30 000-33 000 and 190 000. Using monoclonal anti- SC
antibodies, we isolated cDNA fragments which encode the 190 000 M r
component of rat SCs. The translation product predicted from the nucleotide
sequence of the cDNA, called SCP2 (for synaptonemal complex protein 2), is
a basic protein (pI = 8.0) with a molecular mass of 173 kDa. At the
C-terminus, a stretch of approximately 50 amino acid residues is predicted
to be capable of forming coiled-coil structures. SCP2 contains two clusters
of S/T-P motifs, which are common in DNA- binding proteins. These clusters
flank the central, most basic part of the protein (pI = 9.5). Three of the
S/T-P motifs are potential target sites for p34(cdc2) protein kinase. In
addition, SCP2 has eight potential cAMP/cGMP-dependent protein kinase
target sites. The gene encoding SCP2 is transcribed specifically in the
testis, in meiotic prophase cells. At the amino acid sequence and secondary
structural level, SCP2 shows some similarity to the Red1 protein, which is
involved in meiotic recombination and the assembly of axial elements of SCs
in yeast. We speculate that SCP2 is a DNA-binding protein involved in the
structural organization of meiotic prophase chromosomes.
ARTICLES
SCP2: a major protein component of the axial elements of synaptonemal complexes of the rat
Department of Genetics, Agricultural University, Dreijenlaan 2, NL-6703 HA Wageningen, The Netherlands.
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