>TIGR01011 rpsB_bact ribosomal protein S2; InterPro: IPR005706 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 describes the bacterial, mitochondrial and chloroplast forms of ribosomal protein S2.; GO: 0003735 structural constituent of ribosome, 0006412 translation, 0015935 small ribosomal subunit.

Probab=100.00 E-value=0 Score=790.01 Aligned_cols=223 Identities=50% Similarity=0.884 Sum_probs=219.9 Q ss_pred CCCHHHHHHCCCCCCCCCCCCCCCCCCCCCCCC-CCEEEECHHHHHHHHHHHHHHHHHHHCCCCEEEEEECC-HHHHHHH Q ss_conf 245899986088607547765788562102001-88167538999999999999999861078816996078-2357999 Q gi|254780779|r 5 QFTIRQLLESGVQFGHRNFLWNPKMERYIFCER-NNTHIIDLSQTVPMLQKALQVISDTVARGGRILFVATK-SQASDCV 82 (278) Q Consensus 5 ~~t~~~Ll~ag~H~Gh~~~~wnPkM~~yI~g~r-ngihIIdL~kT~~~L~~A~~~i~~i~~~gg~ILFVgTk-~~~~~~i 82 (278) T Consensus 1 ~vsmk~LleaGvHFGHqtRRWNPkMk~fIf~eRKngihIIDL~kT~~~~~~Ay~~v~~~~~~gg~iLFVGTKNkQA~~~i 80 (227) T TIGR01011 1 VVSMKDLLEAGVHFGHQTRRWNPKMKPFIFGERKNGIHIIDLQKTLQLLEEAYNFVREVVANGGKILFVGTKNKQAKEII 80 (227) T ss_pred CCCHHHHHHCCCCCCCEECCCCCCCCCCCCCCCCCCCEEECHHHHHHHHHHHHHHHHHHHHCCCEEEEEECHHHHHHHHH T ss_conf 97657686388543754223688898855320127851225789999999999999999981995888516588999999 Q ss_pred HHHHHHCCCEECCCCCCCCCCCCHHHHHHHHHHHHHHHHHH-HCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCE Q ss_conf 99986339831423345873234266655567789988763-01212677467887665567776434433221135957 Q gi|254780779|r 83 MEAAKRSAQYCVNSKWLGGMMTNWKTVSQSIQKLRDLEELL-NKENQGFTKKERLNIERKRDKLKRALDGIRDMGGLPDL 161 (278) Q Consensus 83 ~~~A~~~~~~yV~~RWlGG~LTN~~ti~~si~~l~~l~~~~-~~~~~~~tkKe~~~~~r~~~kl~k~lgGi~~m~~lP~~ 161 (278) T Consensus 81 ~~~A~r~g~~YVn~RWLGGMLTNf~TirkSi~kL~~lE~~~~~g~~~~LtKKE~~~L~Re~~KL~k~LgGIk~M~~lPd~ 160 (227) T TIGR01011 81 KEEAERCGMFYVNQRWLGGMLTNFKTIRKSIKKLKKLEKMEEDGTFDVLTKKEILMLSREKEKLEKNLGGIKDMKKLPDL 160 (227) T ss_pred HHHHHHCCCCEECCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCE T ss_conf 99998748962113334640024799999999999999877613312477000776789999986553002545316970 Q ss_pred EEEECCCCCCHHHHHHHHCCCEEEEECCCCCCCHHCCCEEEECCCCHHHHHHHHHHHHHHHHHHHH Q ss_conf 999438877123212343398145403677670011520321577268999999999999999999 Q gi|254780779|r 162 MFVVDTNREKLAIQEARRLRIPIVAVVDTNSNPDLVDYVIPGNDDSSRSIALFCDLVASAAIDGIA 227 (278) Q Consensus 162 iiv~d~~~e~~Av~EA~kl~IPvIaivDTn~dp~~idypIP~NDds~~si~l~~~~i~~ai~~g~~ 227 (278) T Consensus 161 l~viD~~~E~IAv~EA~kLgIPvvA~vDTNCdPd~vD~~IPgNDDairSi~L~~~~~AdAv~Eg~~ 226 (227) T TIGR01011 161 LFVIDPRKEKIAVAEARKLGIPVVAIVDTNCDPDVVDYPIPGNDDAIRSIRLLTSLIADAVLEGKQ 226 (227) T ss_pred EEEECCCCCHHHHHHHHHCCCCEEEEECCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHC T ss_conf 899748210689999733799789870478888866502579730589999999999999986514

HHsearch alignment for GI: 254780779 and conserved domain: TIGR01011