Ropporin-1B (Rhophilin-associated protein 1B, ROPN1B)

Function

• interacts with RHPN1
• may interact with SPA17
• interacts with AKAP3

Structure

• homodimer.
• contains 1 RIIa domain, mediates interaction with AKAP3
• belongs to the ropporin family

Compartment

• in sperm tail, found in the principal piece & in the cytoplasmic droplet located at the distal end of the midpiece
• inner surface of the fibrous sheath

Alternative splicing

named isoforms=2

Notes

• the name 'ropporin' comes from the Japanese word 'oppo' which means 'tail'

More general terms

• uncharacterized protein

Database

• UniProt: http://www.uniprot.org/uniprot/Q9BZX4.html