Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding. Arabidopsis thaliana (taxid: 3702)
>sp|O04438|SRP09_MAIZE Signal recognition particle 9 kDa protein OS=Zea mays GN=SRP9 PE=3 SV=1
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Zea mays (taxid: 4577)
>sp|Q55GL2|SRP09_DICDI Signal recognition particle 9 kDa protein OS=Dictyostelium discoideum GN=srp9 PE=3 SV=1
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Dictyostelium discoideum (taxid: 44689)
>sp|P34642|SRP09_CAEEL Signal recognition particle 9 kDa protein OS=Caenorhabditis elegans GN=ZK512.4 PE=3 SV=1
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Caenorhabditis elegans (taxid: 6239)
>sp|P49962|SRP09_MOUSE Signal recognition particle 9 kDa protein OS=Mus musculus GN=Srp9 PE=1 SV=2
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Mus musculus (taxid: 10090)
>sp|P49458|SRP09_HUMAN Signal recognition particle 9 kDa protein OS=Homo sapiens GN=SRP9 PE=1 SV=2
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Homo sapiens (taxid: 9606)
>sp|P21262|SRP09_CANFA Signal recognition particle 9 kDa protein OS=Canis familiaris GN=SRP9 PE=1 SV=2
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Canis familiaris (taxid: 9615)
>sp|Q4R6I6|SRP09_MACFA Signal recognition particle 9 kDa protein OS=Macaca fascicularis GN=SRP9 PE=3 SV=1
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding.
Macaca fascicularis (taxid: 9541)
>sp|Q9VSC1|SRP09_DROME Signal recognition particle 9 kDa protein OS=Drosophila melanogaster GN=Srp9 PE=3 SV=1
Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. Srp9 together with Srp14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of Srp9 and Srp14 is required for SRP RNA binding.
Drosophila melanogaster (taxid: 7227)
Close Homologs in the Non-Redundant Database Detected by BLAST
This family consists of several eukaryotic SRP9 proteins. SRP9 together with the Alu-homologous region of 7SL RNA and SRP14 comprise the "Alu domain" of SRP, which mediates pausing of synthesis of ribosome associated nascent polypeptides that have been engaged by the targeting domain of SRP. This family also contains the homologous fungal SRP21. Length = 76
>PF05486 SRP9-21: Signal recognition particle 9 kDa protein (SRP9); InterPro: IPR008832 The signal recognition particle (SRP) is a multimeric protein, which along with its conjugate receptor (SR), is involved in targeting secretory proteins to the rough endoplasmic reticulum (RER) membrane in eukaryotes, or to the plasma membrane in prokaryotes [, ]
SRP recognises the signal sequence of the nascent polypeptide on the ribosome, retards its elongation, and docks the SRP-ribosome-polypeptide complex to the RER membrane via the SR receptor. Eukaryotic SRP consists of six polypeptides (SRP9, SRP14, SRP19, SRP54, SRP68 and SRP72) and a single 300 nucleotide 7S RNA molecule. The RNA component catalyses the interaction of SRP with its SR receptor []. In higher eukaryotes, the SRP complex consists of the Alu domain and the S domain linked by the SRP RNA. The Alu domain consists of a heterodimer of SRP9 and SRP14 bound to the 5' and 3' terminal sequences of SRP RNA. This domain is necessary for retarding the elongation of the nascent polypeptide chain, which gives SRP time to dock the ribosome-polypeptide complex to the RER membrane. In archaea, the SRP complex contains 7S RNA like its eukaryotic counterpart, yet only includes two of the six protein subunits found in the eukarytic complex: SRP19 and SRP54 []. This entry represents the 9 kDa SRP9 component. Both SRP9 and SRP14 have the same (beta)-alpha-beta(3)-alpha fold. The heterodimer has pseudo two-fold symmetry and is saddle-like, consisting of a curved six-stranded beta-sheet that has four helices packed on the convex side and an exposed concave surface lined with positively charged residues. The SRP9/SRP14 heterodimer is essential for SRP RNA binding, mediating the pausing of synthesis of ribosome associated nascent polypeptides that have been engaged by the targeting domain of SRP [].; GO: 0008312 7S RNA binding, 0006614 SRP-dependent cotranslational protein targeting to membrane, 0045900 negative regulation of translational elongation, 0048500 signal recognition particle; PDB: 1E8O_A 1RY1_C.
>cd07268 Glo_EDI_BRP_like_4 This conserved domain belongs to a superfamily including the bleomycin resistance protein, glyoxalase I, and type I ring-cleaving dioxygenases
This protein family belongs to a conserved domain superfamily that is found in a variety of structurally related metalloproteins, including the bleomycin resistance protein, glyoxalase I, and type I ring-cleaving dioxygenases. A bound metal ion is required for protein activities for the members of this superfamily. A variety of metal ions have been found in the catalytic centers of these proteins including Fe(II), Mn(II), Zn(II), Ni(II) and Mg(II). The protein superfamily contains members with or without domain swapping. The proteins of this family share three conserved metal binding amino acids with the type I extradiol dioxygenases, which shows no domain swapping.
>cd05992 PB1 The PB1 domain is a modular domain mediating specific protein-protein interactions which play a role in many critical cell processes, such as osteoclastogenesis, angiogenesis, early cardiovascular development, and cell polarity
A canonical PB1-PB1 interaction, which involves heterodimerization of two PB1 domain, is required for the formation of macromolecular signaling complexes ensuring specificity and fidelity during cellular signaling. The interaction between two PB1 domain depends on the type of PB1. There are three types of PB1 domains: type I which contains an OPCA motif, acidic aminoacid cluster, type II which contains a basic cluster, and type I/II which contains both an OPCA motif and a basic cluster. Interactions of PB1 domains with other protein domains have been described as a noncanonical PB1-interactions. The PB1 domain module is conserved in amoebas, fungi, animals, and plants.