Protein: TCDB2_CLODI
Sequence: MSLVNRKQLEKMANVRFRVQEDEYVAILDALEEYHNMSENTVVEKYLKLKDINSLTDTYIDTYKKSGRNKALKKFKEYLVTEILELKNSNLTPVEKNLHFIWIGGQINDTAINYINQWKDVNSDYNVNVFYDSNAFLINTLKKTIIESASNDTLESFRENLNDPEFNHTAFFRKRMQIIYDKQQNFINYYKAQKEENPDLIIDDIVKTYLSNEYSKDIDELNAYIEESLNKVTENSGNDVRNFEEFKTGEVFNLYEQELVERWNLAGASDILRVAILKNIGGVYLDVDMLPGIHPDLFKDINKPDSVKTAVDWEEMQLEAIMKYKEYIPEYTSKHFDTLDEEVQSSFESVLASKSDKSEIFLPLGGIEVSPLEVKVAFAKGSIIDQALISAKDSYCSDLLIKQIQNRYKILNDTLGPIISQGNDFNTTMNNFGESLGAIANEENISFIAKIGSYLRVGFYPEANTTITLSGPTIYAGAYKDLLTFKEMSIDTSILSSELRNFEFPKVNISQATEQEKNSLWQFNEERAKIQFEEYKKNYFEGALGEDDNLDFSQNTVTDKEYLLEKISSSTKSSERGYVHYIVQLQGDKISYEAACNLFAKNPYDSILFQKNIEDSEVAYYYNPTDSEIQEIDKYRIPDRISDRPKIKLTLIGHGKAEFNTDIFAGLDVDSLSSEIETILDLAKADISPKSIEINLLGCNMFSYSVNVEETYPGKLLLRVKDKVSELMPSISQDSIIVSANQYEVRINSEGRRELLDHSGEWINKEESIIKDISSKEYISFNPKENKIIVKSKNLPELSTLLQEIRNNSNSSDIELEEKVMLAECEINVISNIETQVVEERIEEAKSLTSDSINYIKNEFKLIESISDALYDLKQQNELEESHFISFEDISKTDEGFSIRFIDKETGESIFVETEKAIFSEYANHITEEISKLKDTIFDTVNGKLVKKVTLDATHEVNTLNAAFFIQSLIGYNSSKESLSNLSVAMKVQVYAQLFSTGLNTITDAAKVVELVSTALDETIDLLPTLSEGLPVIATIIDGVSLGASIKELSETSDPLLRQEIEAKIGIMAVNLTAATTAIITSSLGIASGFSILLVPLAGISAGIPSLVNNELILRAEAKNVVDYFGHISLAESEGAFTLLDDKIMMPQDDLVISEIDFNNNSITLGKCEIWRMEGGSGHTVTDDIDHFFSAPSTTYREPYLSIYDVLDVKEEELDLSKDLMVLPNAPDRIFGWERGWTPGLRSLENDGTKLLDRIRDHYEGQFYWRFFAFIADSVITKLKPRYEDTNIRISLDSNTRSFIVPVITTEYIREKLSYSFYGSGGTYALSLSQYNMNINIELNENDTWVIDVDNVVRDVTIESDKIKKGDLIENILSKLSIEDNKIILDNHEINFSGTLNGGNGFVSLTFSILEGINAVIEVDLLSKSYKVLISGELKTLMANSNSVQQKIDYIGLNSELQKNIPYSFMDDEGKENGFINCFTKEGLFVSELSDVVLIIKVYMDNSKPPFGYYSNDLKDVKVITKDDVIIITGYYLKDDIKISLSFTIQDKNTIKLNGVYLDENGVAEILKFMNKKGSTNTSDSLMSFLESMNIKSIFIKSLKSNAKLILDTNFIISGTTFIGQFEFICDKDNNIQPYFIKFNTLETKYTLYVGNRQNMIVEPNYNLDDSGDISSTVINFSQKYLYGIDSCVNKVVISPGIYTDEINITPVHEANNTYPEVIVLDTNYISEKINININDLSIRYVWSNDGSDFILMSTDEENKVSQVKIRFTNVFKGNTISDKISFNFSDKQDISINKIISTFTPSYYVEGLLNYDLGLISLYNEKFYINNLGMMVSGLVYINDSLYYFKPPIKNLITGFTTIGDDKYYFNPDNGGPASVGETIIDGKNYYFSQNGVLQTGVFSTEDGFKYFAPADTLDENLEGEAIDFTGKLIIDENVYYFGDNYRAAIEWQTLDDEVYYFSTDTGRAFKGLNQIGDDKFYFNSDGIMQKGFVNINDKTFYFDDSGVMKSGYTEIDGRYFYFAENGEMQIGVFNTADGFKYFAHHDEDLGNEEGEALSYSGILNFNNKIYYFDDSFTAVVGWKDLEDGSKYYFDENTAEASIGISIINDGKYYFNDSGIMQIGFVTINNEVFYFSDSGIVESGMQNIDDNYFYISENGLVQIGVFDTSDGYKYFAPANTVNDNIYGQAVEYSGLVRVNEDVYSFGESYTIETGWIYDSENESDKYYFDPEAKKAYKGINVIDDIKYYFDENGIMRTGLITFEDNHYYFNEDGEMQYGYLNIEDKMFYFSEDGIMQIGVFNTPDGFKYFAHQNTLDENFEGESINYTGWLDLDEKRYYFTDEYIAATGSVIIDGEEYYFDPDTAQLVISE
What is the function of this protein?
Active form of the toxin, which is released into the host cytosol following autoprocessing and inactivates small GTPases.  Acts by mediating monoglucosylation of small GTPases of the Rho family (Rac1, RhoA, RhoB, RhoC, RhoG and Cdc42) in host cells at the conserved threonine residue located in the switch I region ('Thr-37/35'), using UDP-alpha-D-glucose as the sugar donor.  Monoglucosylation of host small GTPases completely prevents the recognition of the downstream effector, blocking the GTPases in their inactive form, leading to actin cytoskeleton disruption and cell death, resulting in the loss of colonic epithelial barrier function.
What are the official names of this protein?
Toxin B.
What is the protein family that this protein belongs to?
Belongs to the clostridial glucosylating toxin (LCGT) family.
What are the subcellular locations of this protein?
[Toxin B]: Secreted. Host endosome membrane. Note=Secreted from C.difficile cell into the extracellular environment via help of holin-like protein TcdE/UtxA. Binds to the cell surface receptors via the receptor-binding region and enters the cells via clathrin-mediated endocytosis. Acidification in the endosome triggers conformational changes that promote the membrane insertion of the translocation region, allowing formation of a pore, leading to translocation of the GT44 and peptidase C80 domains across the endosomal membrane. 1D-myo-inositol hexakisphosphate-binding (InsP6) activates the peptidase C80 domain and autoprocessing, generating the Glucosyltransferase TcdB form, which is released in the host cytosol. SUBCELLULAR LOCATION: [Glucosyltransferase TcdB]: Host cytoplasm, host cytosol. Host cell membrane; Peripheral membrane protein; Cytoplasmic side. Note=Binding to phospholipids, such as phosphatidylserine and phosphatidic acid promotes localization to the inner face of the cell membrane close to its membrane anchored substrates (small GTPases).