Plays a role in guidance and morphology of central and peripheral axons and in synaptic morphology. Also required for formation of cell membrane protrusions and for bristle development. Drosophila pseudoobscura pseudoobscura (taxid: 46245)
>sp|Q9VF87|CYFIP_DROME Cytoplasmic FMR1-interacting protein OS=Drosophila melanogaster GN=Sra-1 PE=1 SV=1
Plays a role in guidance and morphology of central and peripheral axons and in synaptic morphology. Also required for formation of cell membrane protrusions and for bristle development.
Drosophila melanogaster (taxid: 7227)
>sp|Q6GQD1|CYFP2_XENLA Cytoplasmic FMR1-interacting protein 2 OS=Xenopus laevis GN=cyfip2 PE=2 SV=1
Component of the CYFIP1-EIF4E-FMR1 complex which binds to the mRNA cap and mediates translational repression. In the CYFIP1-EIF4E-FMR1 complex this subunit is an adapter between EIF4E and FMR1. Promotes the translation repression activity of FMR1 in brain probably by mediating its association with EIF4E and mRNA (By similarity). Regulates formation of membrane ruffles and lamellipodia. Plays a role in axon outgrowth. Binds to F-actin but not to RNA. Part of the WAVE complex that regulates actin filament reorganization via its interaction with the Arp2/3 complex. Actin remodeling activity is regulated by RAC1. Regulator of epithelial morphogenesis. May act as an invasion suppressor in cancers.
Homo sapiens (taxid: 9606)
>sp|Q7TMB8|CYFP1_MOUSE Cytoplasmic FMR1-interacting protein 1 OS=Mus musculus GN=Cyfip1 PE=1 SV=1
Component of the CYFIP1-EIF4E-FMR1 complex which binds to the mRNA cap and mediates translational repression. In the CYFIP1-EIF4E-FMR1 complex this subunit is an adapter between EIF4E and FMR1. Promotes the translation repression activity of FMR1 in brain probably by mediating its association with EIF4E and mRNA (By similarity). Regulates formation of membrane ruffles and lamellipodia. Plays a role in axon outgrowth. Binds to F-actin but not to RNA. Part of the WAVE complex that regulates actin filament reorganization via its interaction with the Arp2/3 complex. Actin remodeling activity is regulated by RAC1. Regulator of epithelial morphogenesis. May act as an invasion suppressor in cancers.
Mus musculus (taxid: 10090)
>sp|O44518|CYFIP_CAEEL Cytoplasmic FMR1-interacting protein homolog OS=Caenorhabditis elegans GN=gex-2 PE=1 SV=4
CYFIP1/2 (Cytoplasmic fragile X mental retardation interacting protein) like proteins for a highly conserved protein family. The function of CYFIPs is unclear, but CYFIP interaction with fragile X mental retardation interacting protein (FMRP) involves the domain of FMRP which also mediating homo- and heteromerization. Length = 815
>gnl|CDD|215574 PLN03099, PIR, Protein PIR; Provisional
>PF05994 FragX_IP: Cytoplasmic Fragile-X interacting family; InterPro: IPR008081 Cytoplasmic fragile X mental retardation protein (FMRP) interacting protein belongs to a highly conserved but, as yet, functionally uncharacterised family
Absence of FMRP is responsible for pathologic manifestations in Fragile X Syndrome, the most frequent cause of inherited mental retardation []. FMRP is an RNA-binding protein that may have a role in local protein translation at neuronal dendrites and in dendritic spine maturation []. CYFIP1 and CYFIP2, which share a high level of sequence identity, have recently been identified as cytoplasmic FMRP interacting proteins []. CYFIP2 interacts with FMRP-related proteins FXR1P/2P, while CYFIP1 interacts exclusively with FMRP. The FMRP-CYFIP interaction involves the domain of FMRP that also mediates homo- and heteromerisation, suggesting competition between the various interaction partners. CYFIP1 also interacts with the small GTPase Rac1 implicated in development and maintenance of neuronal structures. CYFIP1/2 are both present in synaptosomal extracts []. PIR121 (121F-specific p53 inducible RNA) is another functionally uncharacterised member of this family. The PIR121 gene maps to human chromosome 5q34, a region frequently translocated in acute myeloid leukaemia but not known to be amplified or deleted in solid tumours. Interaction between PIR121 and FMRP has been demonstrated, and hence PIR121 has also been termed CYFIP2 (Cytoplasmic FMRP Interacting Protein 2) [, ]. Shyc (Selective HYbridizing Clone) is a cytoplasmic protein of unknown function, expressed in the developing and embryonic nervous system. The protein has also been designated CYFIP1 due to the high sequence identity (98.7%) to its human orthologue. The CYFIP orthologues in Caenorhabditis elegans and Drosophila melanogaster (Fruit fly) share about 51% and 67% sequence identity with the human proteins, respectively []. The high level of conservation manifest throughout the entire CYFIP sequence between various orthologues suggests a number of functionally/structurally important domains. ; PDB: 3P8C_A.
The bap28 mutation leads to abnormalities in the brain, starting at midsomitogenesis stages. Mutant zebrafish embryos display excessive apoptosis, especially in the central nervous system (CNS) that results in death. The mutation affects a gene that encodes a large protein with high similarity to the uncharacterised human protein BAP28 and lower similarity to yeast Utp10. Utp10 is a component of a nucleolar U3 small nucleolar RNA-containing RNP complex that is required for transcription of ribosomal DNA and for processing of 18 S rRNA. Zebrafish Bap28 is also required for rRNA transcription and processing, with a major effect on 18S rRNA maturation. Bap28 is therefore required for cell survival in the CNS through its role in rRNA synthesis and processing [].