2026-09-02 REL RCSB INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY RCSB RCSB 2026-01-26 2026-09-02 2026-09-02 2026-09-02 Agencia Nacional de Investigacion e Innovacion (ANII) Uruguay Brady MR San Martin F Sindelar CV Buschiazzo A Bacterial Endo-flagellum, Filament, PROTEIN FIBRIL San Martin F Brady MR Fule L Nouchikian L Rodriguez A Duchateau M Mondino S Larrieux N Wunder Jr EA Ko AI Rey M Chamot-Rooke J Duran R Trajtenberg F Picardeau M Sindelar CV Buschiazzo A Nat Commun UK 17 2026 42649215 doi:10.1038/s41467-026-75995-6 2041-1723 10lm FULLOVERLAP EMDB EMD-75270 associated EM volume

Native flagellar filament from Leptospira biflexa

native flagellar filament native flagellar filament 0 1 2 3 4 5 6 7 8 9 10 Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' Flagellin Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.031415635 70 LEVO MIINHNVSAIFAHRTLKSNDANLSKDIEKLSSGMRINKAGDDASGLAVSEKMRTQIAGLRRAEQNTEDGMSLIQTAEGYL QETHEIVQRVRVLAVQAANGIYSEEDRQQIQVEVSQLVDEIDRIASQAEFNKMKLLTGAFARLNPTASMWFHIGANMHQR ERVYIETMNTAALGLRNPTVLTFISLSTAGKANSVIGLCDDALRVISKQRADLGAYYNRMEHAAKGLMNAYENTQASESR IRDTDMAEQMTSFTRYQILTQAATSMLAQANMKSQSVMRLLQ B0SQZ5 Flagellar Coiling Protein FcpA Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.035876796999999995 27 LEVO MKIIKYLLILQLVSGFSVLFAQTQPANAQESQAAKDQVDELLKGELVPENDDAELTEDQKKKKKEIMEQESLWKNPDFKG YNKTFQELHQLSKTFANNQFRLALSNYQSGVNTIMKNRDWVEQYRKEEAEKKRLDEKWYWQKVDRKAREERVVYREKMKA KQDALNYFSKAINHLDEIKNPDLRERPEFKRLLSDVYRSWIMAEYDLQNLPQTIPILELYIEIDDNEKEYPAHKYLASAY SFEENMIKKTKGPDDMLFKYRYKKNVHLLRATELKYGKDSPEYKHIVNVINRDEVISVAQ B0STJ8 Flagellar Coiling Protein FcpB Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.031565652 14 LEVO MKIKLILPILLLSIGVFAQTGSSETGSTSAGIDPSQSGKSMADTEKELDDNISEVNKRLRLHTVLFKMKVRTLPHKTVLY KGKPSADGERCEAADKQEAQDNTCLHLEVFDFVGSEDGKSSKNLGAKFKKMELFFEGSNNADPDPRKEQPRNLTKIRTYI YQNNFLLEDKVISVIADVAPNGEPAHNDKIELFYQHDDYPVWGTPETPSEKGVGKYILSNVENTKSNPIRNNFKKQFYFK NLDYFDKLFTKIFDYNDRDSNKHYKKNVEALKGSLKY B0SR03 LEPBI_I1029 protein Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.037285012 4 LEVO MQWLWVISHTSTQCLQNKRIWGILIFENKENLNFINVALSNLAPSQEEAQTTAQPGAETPPQDPSKKNLDFDYFKLLKAA NQSDFSGNMWYLQSNYVYGFRQLRQAQGELKNIFEIVLQKYIEDARALLEAAAPTIIRSNDSNAKALLRLGFRDLRSSED LYTTGLNSSPHQYRYKLTLYKEGILTLRRAKRFAILAMIYSKTPDEDKPEYQYRSNEDLKEARNEEKQRNYEKVRDTLIN FIENKRMERTVVPPGNPDAKPLDLLEQHDDNYGFITSKKLDLLLEANAQIKETEGARRESVPPTPKFDENGKAIYPEEKK K B0SMK8 Flagellar filament outer layer protein (Sheath protein) putative signal peptide Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.027630594 10 LEVO MSFMGKLGMTKLLLGLFLSIGMLYAQADTGGQNTANTANDEDSPLRKIVLDDFEEAEDWRVKATTPLGETRTLKLVQRGL IKDVFDEKTVPEDGGDKIEKNHILGVKTHFAAKGLDRVELYPPHEYIIKGKVRQISVWVLGRKYRHTLFAKFRDYKDVTH NIRLGRLDFFGWRKLTATVPGFIPQSTRFALLDKNLHFVSLFVTSDVHEVAGDFYFYVDDLQVRTDRSEAKYPGSEIKDN W B0SKT5 FlaA2 associated protein B0STF2 Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.033018371 4 LEVO MNKTIFALSFTLLSFALFAQESGNPQGTQVSAASSKDNRDLYPLSMYDARIRLKNVTFVRRHADTGKGEFLDVQVEIESR VPEDHEYSIFVLAGFEGDRVNKDERKLVPYPAWRKADPEKDERTLYFSNIMPTPFTAKEIWGEETYAKKKEEMEKRHYAG FEAAMPEPTFTEVVDYLCKNNAKALPFTLFGETGPSKEKQVIYNYVGQTADEKKRQVHETLPKHTYTIYNNKYKTTITSH HYTQYRPNFLSFNKVAILVFDTKKPTNSLLFRKFIDISDLKITY B0STF2 FlaA2-associated protein FlaAP Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.043060012 4 LEVO MKQSLLILMMSLVMQAPMFAESVSSKSYQKRIELLTYLRELEPIVKNFRGEDPEGKPSELNAPEGKEGFRMKKYLEAKRI YQEGLQYHFEGNFSSAFQRFLECQLAIEKMTEELSQLYILRAEEMMKTAMERKNPNNPMDKALLDISIEYGKGSYFRQDV MDLPREAPYQRRMYDPKEAHYSYNKYDIEKNMELGYKHLGLAKEARANALKVERNLEKHQKLQPSHRKYRIELYFGAINL ARDSKANAVNIYKLKYPYDNYYLNNSQAKTEASKDETGASVEGQPVKIDGVTYDFTKNPYIKYDNRLQAMFDVRVPEEYR VDHADVRGRVYELDSNNMVFMKYDQERKKALNVPPKPAQGSTTTPQQ B0SJC6 LEPBI_I3081 protein Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.027089711 5 LEVO MRTSFVLIFTFLFTVGLFAADEKNESVSQSDATKLNPDGSIALIPYNAKQQQKIERIGKEVDDYHAMINEKVKFLSFEKK IKDSRYGQVTSAREIHLPYEPSYVMHSRFVMKLKGGGGAEGGGFSLDEISFWSRKSLTEKGKDPVTTYRELKNNTTGGVK GLVLSVRTVTNADDNTLNFELEKIQSPWERLRLATAYRDRLREVARTIDRYIQAKGNLETKMISDTVMEVSVSGDFEEP B0SPP1 LEPBI_I0662 protein Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.031206863 3 LEVO MMLRFSILLCYLLGMTALFAEKPASATLKERESQKQIDLQRKNGFGDNEIDTLHANIIGNLRKIKKLQDLGVDKTAAQYL AQTPQEHKELYKKDKDGKPYLEIKLPQGQSYIDYPSVFLYDGIAYIYPKEDYSDLDKIILSFRRVNADGTIHVKEMRRLI NPTPKSEGTEKDEKGEARLDTNSDIRLEYFRSLTSDTIWPNDPVQPAEADIAMVLNDEKDPLPYDKQKHIMMSYKKMLRK IAKQTAFKLRSVELDQKQMITKILDYNTN B0SKN8 LEPBI_II0033 protein Leptospira biflexa serovar Patoc strain 'Patoc 1 (Paris)' 0.020826743999999998 3 LEVO MELSKKSLLFILMFSLAVFSISAQDTKPQSTSTDVTQENHDAKEGQDKELFEYYYKTRPENLPPNKAKLEYNLIKTLKKE IMSRDYSKESAESIKKIDATNIQYERVYRDSKWLRGFMTQNTHLNYMEFMYVVKYDKYMCFVTFDVNPENYLQQSRQSHL VFSGKDKFEITIPKP B0STN7 CALCIUM ION 4.0078e-05 10 CA water 1.8015e-05 20 HOH singleParticle filament 7.6 ETHANE TFS KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 1.5 2.6 GATAN K3 (6k x 4k) 25.7 1 PHASE FLIPPING AND AMPLITUDE CORRECTION Sheathless straight flagellar filament 3D map

filtered to 20 angstroems resolution

3.5 FSC 0.143 CUT-OFF cryoSPARC 4.2.1

Further Density Modification with Phenix Resolve increased resolution to 3.2 angstroems and better resolved features in the cryoEM map

176558 MAXIMUM LIKELIHOOD cryoSPARC

projection matching

MAXIMUM LIKELIHOOD cryoSPARC Other integrative model

we used comparative proteomics (wt and mutants) plus cross-linked+MS data; AlphaFold-redicted Initial models; and crystallographic structures

FLEXIBLE FIT

iteration between real space refinement with Phenix.real_space_refine, and Servalcat (reciprocal space)

RECIPROCAL emd_75270_half_map_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 256 256 256 0 0 0 256 256 256 273.408 273.408 273.408 90.0 90.0 90.0 X Y Z -1.4733918 2.977189 0.12587765 0.45784712 1.068 1.068 1.068 AUTHOR ::::EMDATABANK.org::::EMD-75270:::: emd_75270_half_map_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 256 256 256 0 0 0 256 256 256 273.408 273.408 273.408 90.0 90.0 90.0 X Y Z -1.4905186 3.1049166 0.12559952 0.45752347 1.068 1.068 1.068 AUTHOR ::::EMDATABANK.org::::EMD-75270::::