Molecular and General Genetics MGG

, Volume 237, Issue 1–2, pp 193–205 | Cite as

The prosomal RNA-binding protein p27K is a member of the α-type human prosomal gene family

  • F. Bey
  • I. Silva Pereira
  • O. Coux
  • E. Viegas-Péquignot
  • F. Recillas Targa
  • H. G. Nothwang
  • B. Dutrillaux
  • K. Scherrer


Monoclonal antibodies demonstrated high conservation during evolution of a prosomal protein of Mr 27 000 and differentiation - specific expression of the epitope. More than 90% of the reacting antigen was found as a p27K protein in the free messenger ribonucleoprotein (mRNP) fraction but another protein of Mr 38000, which shared protease fingerprint patterns with the p27K polypeptide, was also labelled in the nuclear and polyribosomal fractions. Sequencing of cDNA recombinant clones encoding the p27/38K protein and comparison with another prosomal protein, p30-33K, demonstrated the existence of a common characteristic sequence pattern containing three highly conserved segments. The genes Hs PROS-27 and Hs PROS-30 were mapped to chromosomes 14 (14g13) and 11 (11p15.1), respectively. The structure of the p27K protein shows multiple potential phosphorylation sites, an NTP-binding fold and an RNA-binding consensus sequence. The Hs PROS-27/β-galactosidase fusion protein binds a single RNA of about 120 nucleotides from total HeLa cell RNA. Sequence comparisons show that the Hs PROS-27 and Hs PROS-30 genes belong to the gene family that encodes the prosome — MCP (multicatalytic proteinase) — proteasome proteins. Comparison with other members of the family from various species allowed us to show that the tripartite consensus sequence characteristic of the α-type sub-family is conserved from archeobacteria to man. The members of this gene family are characterised by very high evolutionary conservation of amino acid sequences of homologous genes and 20%–35 sequence similarity, between different family member within the same species and are clearly distinct from the β-type family.

Key words

Gene family Prosomes Multicatalytic Proteinase (MCP) Proteasomes RNA-binding protein mRNP 


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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • F. Bey
    • 1
  • I. Silva Pereira
    • 1
  • O. Coux
    • 1
  • E. Viegas-Péquignot
    • 2
  • F. Recillas Targa
    • 1
  • H. G. Nothwang
    • 1
  • B. Dutrillaux
    • 2
  • K. Scherrer
    • 1
  1. 1.Institut Jacques Monod du CNRSUniversité Paris 7Paris Cedex 05France
  2. 2.Institut CurieParisFrance

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