CryoEM structure of human MATa2 in complex with MAT2B isoform v1 at 2.6 A resolution

2026-07-15 REL PDBe INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY STRUCTURE_SUMMARY em_admin entity _em_admin.last_update _entity.pdbx_description STRUCTURE_SUMMARY em_admin entity _em_admin.last_update _entity.pdbx_description DATABASE_REFERENCES citation citation_author em_admin _citation.country _citation.journal_abbrev _citation.journal_id_CSD _citation.journal_id_ISSN _citation.pdbx_database_id_DOI _citation.pdbx_database_id_PubMed _citation.title _citation.year _citation_author.identifier_ORCID _citation_author.name _em_admin.last_update EXPERIMENTAL_SUMMARY citation citation_author em_admin _citation.country _citation.journal_abbrev _citation.journal_id_CSD _citation.journal_id_ISSN _citation.pdbx_database_id_DOI _citation.pdbx_database_id_PubMed _citation.title _citation.year _citation_author.identifier_ORCID _citation_author.name _em_admin.last_update DATABASE_REFERENCES citation citation_author em_admin _citation.journal_volume _citation.page_first _citation.page_last _citation_author.identifier_ORCID _em_admin.last_update EXPERIMENTAL_SUMMARY citation citation_author em_admin _citation.journal_volume _citation.page_first _citation.page_last _citation_author.identifier_ORCID _em_admin.last_update PDBe PDBe 2025-03-27 2026-04-08 2026-04-08 2026-07-15 Not funded CryoEM structure of human MATa2 in complex with MAT2B isoform v1 at 2.6 A resolution Khaja F Antonyuk SV Muench SP Hasnain SS Methylation, Adomet, SAMe, protein-protein complexes, TRANSFERASE Khaja FT Vara R Aspinall LP Merriman C Maerivoet A White JBR Muench SP Hasnain SS Antonyuk SV CryoEM structures reveal allosteric regulation of the catalytic activity of the multi-protein human MAT enzyme complexes. Iucrj UK 13 373 384 2026 42329745 doi:10.1107/S2052252526005075 2052-2525 9qpp FULLOVERLAP EMDB EMD-53277 associated EM volume

human MATA2 in complex with MATB isoform v1 human MATA2 in complex with MATB isoform v1 0 2

4MATA2 plus 2MATB

Homo sapiens 0.24975 S-adenosylmethionine synthase isoform type-2 Homo sapiens 0.043720625 4 Escherichia coli LEVO MNGQLNGFHEAFIEEGTFLFTSESVGEGHPDKICDQISDAVLDAHLQQDPDAKVACETVAKTGMILLAGEITSRAAVDYQ KVVREAVKHIGYDDSSKGFDYKTCNVLVALEQQSPDIAQGVHLDRNEEDIGAGDQGLMFGYATDETEECMPLTIVLAHKL NAKLAELRRNGTLPWLRPDSKTQVTVQYMQDRGAVLPIRVHTIVISVQHDEEVCLDEMRDALKEKVIKAVVPAKYLDEDT IYHLQPSGRFVIGGPQGDAGLTGRKIIVDTYGGWGAHGGGAFSGKDYTKVDRSAAYAARWVAKSLVKGGLCRRVLVQVSY AIGVSHPLSISIFHYGTSQKSERELLEIVKKNFDLRPGVIVRDLDLKKPIYQRTAAYGHFGRDSFPWEVPKKLKY P31153 2.5.1.6 Isoform 1 of Methionine adenosyltransferase 2 subunit beta Homo sapiens 0.037603781

The residues at position 20,21 and 23 in Chain F and Chain G i.e. 'VFH', are actually the C-terminal residues 332, 333 and 334 of the same chain.

3 Escherichia coli BL21 LEVO MVGREKELSIHFVPGSCRLVEEEVNIPNRRVLVTGATGLLGRAVHKEFQQNNWHAVGCGFRRARPKFEQVNLLDSNAVHH IIHDFQPHVIVHCAAERRPDVVENQPDAASQLNVDASGNLAKEAAAVGAFLIYISSDYVFDGTNPPYREEDIPAPLNLYG KTKLDGEKAVLENNLGAAVLRIPILYGEVEKLEESAVTVMFDKVQFSNKSANMDHWQQRFPTHVKDVATVCRQLAEKRML DPSIKGTFHWSGNEQMTKYEMACAIADAFNLPSSHLRPITDSPVLGAQRPRNAQLDCSKLETLGIGQRTPFRIGIKESLW PFLIDKRWRQTVFH Q9NZL9 water 1.8015e-05 173 HOH singleParticle particle 0.125 7.5 0.05 Hepes

50mM HEPES pH 7.5, 150mM NaCl and 1mM DTT

ETHANE-PROPANE TFS KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 2.7 0.6 2.4 165000.0 FEI FALCON IV (4k x 4k) 40.0 1 PHASE FLIPPING AND AMPLITUDE CORRECTION 4NDN C1 2.6 FSC 0.143 CUT-OFF cryoSPARC 122584 MAXIMUM LIKELIHOOD MAXIMUM LIKELIHOOD emd_53277.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 380 380 380 0 0 0 380 380 380 281.2 281.2 281.2 90.0 90.0 90.0 X Y Z -0.50312614 1.22154 0.0003190375 0.03331969 0.74 0.74 0.74 0.0647 AUTHOR ::::EMDATABANK.org::::EMD-53277:::: emd_53277_additional_3.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 380 380 380 0 0 0 380 380 380 281.2 281.2 281.2 90.0 90.0 90.0 X Y Z -1.1418867 2.876363 0.0003095944 0.020262083 0.74 0.74 0.74 AUTHOR ::::EMDATABANK.org::::EMD-53277:::: Local resolution map for MATBV1 subunit emd_53277_additional_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 380 380 380 0 0 0 380 380 380 281.2 281.2 281.2 90.0 90.0 90.0 X Y Z -0.0017655361 1.7584007 0.0014013965 0.027037892 0.74 0.74 0.74 AUTHOR ::::EMDATABANK.org::::EMD-53277:::: DeepEMhancer generated sharpened map emd_53277_additional_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 380 380 380 0 0 0 380 380 380 281.2 281.2 281.2 90.0 90.0 90.0 X Y Z -2.70524 4.6076684 0.00031903756 0.10739324 0.74 0.74 0.74 AUTHOR ::::EMDATABANK.org::::EMD-53277:::: Sharpened map from the final map as obtained from cryosparc emd_53277_half_map_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 380 380 380 0 0 0 380 380 380 281.2 281.2 281.2 90.0 90.0 90.0 X Y Z -0.66965914 1.3561815 0.00061329367 0.056962583 0.74 0.74 0.74 AUTHOR ::::EMDATABANK.org::::EMD-53277:::: emd_53277_half_map_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 380 380 380 0 0 0 380 380 380 281.2 281.2 281.2 90.0 90.0 90.0 X Y Z -0.63265 1.3276355 0.00059144053 0.056600552 0.74 0.74 0.74 AUTHOR ::::EMDATABANK.org::::EMD-53277::::