>TIGR00855 L12 ribosomal protein L7/L12; InterPro: IPR000206 Ribosomes are the particles that catalyse mRNA-directed protein synthesis in all organisms. The codons of the mRNA are exposed on the ribosome to allow tRNA binding. This leads to the incorporation of amino acids into the growing polypeptide chain in accordance with the genetic information. Incoming amino acid monomers enter the ribosomal A site in the form of aminoacyl-tRNAs complexed with elongation factor Tu (EF-Tu) and GTP. The growing polypeptide chain, situated in the P site as peptidyl-tRNA, is then transferred to aminoacyl-tRNA and the new peptidyl-tRNA, extended by one residue, is translocated to the P site with the aid the elongation factor G (EF-G) and GTP as the deacylated tRNA is released from the ribosome through one or more exit sites , . About 2/3 of the mass of the ribosome consists of RNA and 1/3 of protein. The proteins are named in accordance with the subunit of the ribosome which they belong to - the small (S1 to S31) and the large (L1 to L44). Usually they decorate the rRNA cores of the subunits. Many of ribosomal proteins, particularly those of the large subunit, are composed of a globular, surfaced-exposed domain with long finger-like projections that extend into the rRNA core to stabilise its structure. Most of the proteins interact with multiple RNA elements, often from different domains. In the large subunit, about 1/3 of the 23S rRNA nucleotides are at least in van der Waal's contact with protein, and L22 interacts with all six domains of the 23S rRNA. Proteins S4 and S7, which initiate assembly of the 16S rRNA, are located at junctions of five and four RNA helices, respectively. In this way proteins serve to organise and stabilise the rRNA tertiary structure. While the crucial activities of decoding and peptide transfer are RNA based, proteins play an active role in functions that may have evolved to streamline the process of protein synthesis. In addition to their function in the ribosome, many ribosomal proteins have some function 'outside' the ribosome , . This family of large subunit ribosomal proteins is called the L7/L12 family. L7/L12 is present in each 50S subunit in four copies organised as two dimers. The L8 protein complex consisting of two dimers of L7/L12 and L10 in Escherichia coli ribosomes is assembled on the conserved region of 23 S rRNA termed the GTPase-associated domain . The L7/L12 dimer probably interacts with EF-Tu. L7 and L12 only differ in a single post translational modification of the addition an acetyl group to the N terminus of L7.; GO: 0003735 structural constituent of ribosome, 0006412 translation, 0005622 intracellular, 0005840 ribosome.

Probab=100.00  E-value=0  Score=302.86  Aligned_cols=124  Identities=62%  Similarity=0.850  Sum_probs=116.2

Q ss_pred             CCCH--HHHHHHHHHCCHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCC--CCCCCCCCCCEEEEE-ECCCCCC-CHHH
Q ss_conf             9718--99999996099999999999999993787100012235544443--222222243115777-4377554-3357
Q gi|254780144|r    1 MSNI--ESIVEKLSSLTLIEAAELSKRLEKEWGVSASAPVSVVAPVAAEA--GSAASEKTEFEVVLK-GFDDPKK-KIAV   74 (126)
Q Consensus         1 maki--~~ive~i~~LTllE~~eLv~~leekfgv~~~~~~~~~~~~~~~~--~~~~~EKt~fdV~L~-~~~~~~~-Ki~v   74 (126)
T Consensus         1 Ma~l~~~~i~E~l~~~tvlE~~eLvK~~EE~FGVsAAa~Vaa~a~~aaAa~a~~aaEE~TEF~ViL~~~~a--d~aKi~V   78 (131)
T TIGR00855         1 MAKLSKEQIIEALKSLTVLELSELVKALEEKFGVSAAAPVAAAAAAAAAAAAAAAAEEKTEFDVILKDAGA--DKAKIAV   78 (131)
T ss_pred             CCCCCHHHHHHHHHCCCHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCHHHHHHCCCEEEEECCCCC--CCCCEEE
T ss_conf             97665889999986680333889999875412884243001314433356765433205650588745678--8411321


Q ss_pred             HHHHHH-HCCCCHHHHHHHHHHCCHHHHHCCCHHHHHHHHHHHHHCCCEEEEC
Q ss_conf             877677-6599889999998637977660999899999999999748579939
Q gi|254780144|r   75 IKEVRA-ITDLGLKEAKELVESAPKSLKTGLSKDEANEMKKKLEDAGATVELR  126 (126)
Q Consensus        75 IK~vR~-it~LgLkEAK~lVe~~P~~ike~v~keeAE~ik~~Le~aGa~VeiK  126 (126)
T Consensus        79 iKvVR~~ITGLGLkEAK~LVe~aPk~~KE~v~KeeAE~~KkkLeeaGA~VevK  131 (131)
T TIGR00855        79 IKVVREVITGLGLKEAKDLVEKAPKALKEGVSKEEAEEIKKKLEEAGAKVEVK  131 (131)
T ss_pred             EEEECHHHCCCHHHHHHHHHHHCCCHHHCCCCHHHHHHHHHHHHHCCCEEEEC
T ss_conf             23320002142368899998606801223889768999999997477416629