8UX4: Small ribosomal subunit protein mS38

Name: PDB 8UX4: Mitochondrial ribosome of saccharomyces cerevisiae class II from YEP with Dextrose culture
Published: 2026-01-21
License: https://creativecommons.org/publicdomain/zero/1.0/
Keywords: ribosome

Mitochondrial ribosome of saccharomyces cerevisiae class II from YEP with Dextrose culture. Determined by electron microscopy at 3.3 Å resolution. Released 21 Jan 2026.

Method: Electron microscopy
Resolution: 3.3 Å
Organism: Saccharomyces cerevisiae
Chains: 76
Atoms: 201,676
Mol. weight: 3013.31 kDa
Released: 21 Jan 2026

Explore 8UX4 in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

8UX4 contains 696 α-helices and 536 β-strands across 72 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chain 0: 1 helix, 4 β-strands

Element	Residues	Length	Sheet
β-strand	57-59	3	63
β-strand	69-74	6	63
β-strand	77-82	6	63
α-helix	86-88	3
β-strand	90-92	3	63

Chain 1: 18 helices, 15 β-strands

Element	Residues	Length	Sheet
α-helix	21-23	3
α-helix	30-32	3
α-helix	37-43	7
α-helix	58-63	6
α-helix	66-67	2
α-helix	70-94	25
α-helix	98-109	12
α-helix	113-120	8
α-helix	137-149	13
α-helix	151-162	12
α-helix	165-168	4
β-strand	176-181	6	72
β-strand	191	1	72
α-helix	192-193	2
β-strand	196	1	73
α-helix	206-207	2
β-strand	208-213	6	72
β-strand	223-229	7	73
β-strand	233-235	3	74
β-strand	240-242	3	74
β-strand	245-253	9	73
β-strand	260-261	2	72
α-helix	268-270	3
β-strand	271-273	3	73
α-helix	280-281	2
β-strand	282	1	75
β-strand	287-295	9	73
α-helix	296-299	4
α-helix	322-329	8
β-strand	332-341	10	73
α-helix	347-354	8
β-strand	361	1	75
β-strand	362	1	76

Chain 2: 4 helices, 1 β-strand

Element	Residues	Length	Sheet
α-helix	37-49	13
α-helix	63-108	46
α-helix	110-116	7
α-helix	130-132	3
β-strand	133	1	80

Chain 3: 5 helices, 6 β-strands

Element	Residues	Length	Sheet
β-strand	63-64	2	83
β-strand	70-71	2	83
α-helix	74-76	3
β-strand	78-80	3	84
β-strand	93-95	3	85
α-helix	99-101	3
β-strand	102-103	2	86
α-helix	111-113	3
α-helix	115-128	14
α-helix	134-137	4
β-strand	143-144	2	86

Chain 4: 6 helices, 7 β-strands

Element	Residues	Length	Sheet
β-strand	3-5	3	88
β-strand	11	1	89
β-strand	23-30	8	90
α-helix	35-37	3
α-helix	38-45	8
α-helix	48-55	8
β-strand	60-65	6	90
β-strand	71-76	6	90
β-strand	83-85	3	90
α-helix	91-103	13
α-helix	107-109	3
β-strand	119	1	91
α-helix	123-124	2

Chain 5: 20 helices, 12 β-strands

Element	Residues	Length	Sheet
α-helix	69-86	18
α-helix	89-94	6
α-helix	96-105	10
α-helix	113-120	8
β-strand	121	1	93
α-helix	129-132	4
α-helix	134-136	3
β-strand	139	1	94
α-helix	153-174	22
α-helix	180-191	12
α-helix	193-203	11
β-strand	207	1	95
α-helix	212-218	7
α-helix	222-227	6
β-strand	229	1	95
β-strand	230	1	93
β-strand	235	1	94
α-helix	239-241	3
β-strand	242-243	2	50
α-helix	248-250	3
α-helix	252-271	20
α-helix	278-286	9
β-strand	291	1	89
α-helix	294-297	4
β-strand	298-300	3	88
α-helix	303-313	11
α-helix	317-318	2
β-strand	319-327	9	96
β-strand	335-342	8	96
β-strand	345-352	8	96
α-helix	355-371	17
α-helix	380-381	2

Chain 6: 11 helices, 13 β-strands

Element	Residues	Length	Sheet
β-strand	24-31	8	101
β-strand	32-33	2	102
β-strand	37	1	80
α-helix	38-42	5
α-helix	43-59	17
α-helix	60-63	4
α-helix	65-68	4
α-helix	74-82	9
α-helix	85-89	5
β-strand	94	1	79
β-strand	102	1	103
β-strand	107	1	103
α-helix	142-144	3
α-helix	148-152	5
β-strand	166-171	6	102
β-strand	177-178	2	102
β-strand	181-183	3	101
α-helix	191-203	13
β-strand	209-211	3	101
β-strand	218-222	5	101
β-strand	227-236	10	101
β-strand	253-257	5	102
α-helix	259-265	7
α-helix	268-273	6

Chain 7: 3 helices, 7 β-strands

Element	Residues	Length	Sheet
β-strand	55	1	110
β-strand	66-68	3	111
β-strand	78-82	5	112
α-helix	83-86	4
β-strand	88-93	6	112
β-strand	96-98	3	111
α-helix	100-110	11
β-strand	119-122	4	112
β-strand	127-130	4	112
α-helix	135-143	9

64 more chain groups are not listed. Open the entry in the viewer and use the sequence panel to see them.

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Small ribosomal subunit protein mS38	AA	protein	34	Saccharomyces cerevisiae	P32344 (AlphaFold model)
Small ribosomal subunit protein mS41	AB	protein	95	Saccharomyces cerevisiae	P38783 (AlphaFold model)
Small ribosomal subunit protein mS42	AC	protein	259	Saccharomyces cerevisiae	P47141 (AlphaFold model)
Small ribosomal subunit protein mS43	AD	protein	301	Saccharomyces cerevisiae	P10662 (AlphaFold model)
Small ribosomal subunit protein mS27	AE	protein	298	Saccharomyces cerevisiae	P12686
Small ribosomal subunit protein mS45	AF	protein	320	Saccharomyces cerevisiae	P53292
Small ribosomal subunit protein mS23	AG	protein	236	Saccharomyces cerevisiae	P40496
Small ribosomal subunit protein mS26	AH	protein	234	Saccharomyces cerevisiae	P17558
Small ribosomal subunit protein mS29	AI	protein	405	Saccharomyces cerevisiae	Q01163
Small ribosomal subunit protein mS33	AJ	protein	96	Saccharomyces cerevisiae	P53305
Small ribosomal subunit protein mS35	AK	protein	264	Saccharomyces cerevisiae	Q03976
Small ribosomal subunit rRNA	AL	RNA	1498	Saccharomyces cerevisiae

64 more molecules are not listed.

Sequence of entity 1 (AA), FASTA

>8UX4_1 Small ribosomal subunit protein mS38 (chains AA)
DSVMRKRKKKMKKHKLRKRRKREKAERRKLSQGR

Sequence of entity 2 (AB), FASTA

>8UX4_2 Small ribosomal subunit protein mS41 (chains AB)
DQVPDVDAFLNKIGRNCNELKDTFENNWNNLFQWDSKILKEKGVNIQQRKYILKQVHNYR
NNRPIHEIKLGKKSFFGGERKRKAFTAKWKAENKQ

Sequence of entity 3 (AC), FASTA

>8UX4_3 Small ribosomal subunit protein mS42 (chains AC)
IHVVPKLPNSKALLQNGVPNILSSSGFKTVWFDYQRYLCDKLTLATAGQSLESYYPFHIL
LKTAGNPLQSNIFNLASSIHNNHLFVENILPSAVEHGTNSNAVVKTEPSRLFLSKIKDSF
NGSDWEVVKEEMIYRAENEVLGQGWLFLVENNEKKLFILTSNNNGTPYYFPRNQSFDLNS
AISIDEFATLKQMKELIGKSTKLNGKVQDWTMPIICVNLWDHAYLHDYGVGNRSKYVKNV
LDNLNWSVVNNRIFSGISK

Sequence of entity 4 (AD), FASTA

>8UX4_4 Small ribosomal subunit protein mS43 (chains AD)
YSTRYALEHLKEGAPLKGLFSIEGLQKAWFDRVKYLDAKLNDCTNEAQQKPLETLIHENS
KSASKKHIVNYASSLYNLKFSMSSLQGCIRTPPEECPRLGPEALLQTPDFNRTISNEPLT
TGNERLQAALISSFGSLMEFRTLLINSNLAISGDGFTWLVARRQLDKRAMRNDMPNRDIE
YDKLFILNTYNAGTPFNFSTSGVMNELNNQYTNMEKQRAKEAGNLEDSEMTAKQAKTKFI
YETQQKGFSGKEVSYIPLLAIDASPKTWLTDYGVFGKREYLERVWDSIEWKIVESRLPQR
T

Sequence of entity 5 (AE), FASTA

>8UX4_5 Small ribosomal subunit protein mS27 (chains AE)
RSTVWRRFASTGEIAKAKLDEFLIYHKTDAKLKPFIYRPKNAQILLTKDIRDPKTREPLQ
PRPPVKPLSKQTLNDFIYSVEPNSTELLDWFKEWTGTSIRKRAIWTYISPIHVQKMLTAS
FFKIGKYAHMVGLLYGIEHKFLKAQNPSVFDIEHFFNTNIMCALHRNRLKDYKDAEIAQR
KLQVAWKKVLNRKNNTGLANILVATLGRQIGFTPELTGLQPVDISLPDIPNSSSGAELKD
LLSKYEGIYLIARTLLDIDQHNAQYLELQEFIRQYQNALSESSDPYDTHLKALGLLET

Sequence of entity 6 (AF), FASTA

>8UX4_6 Small ribosomal subunit protein mS45 (chains AF)
HFSRRRIAYPFYPFKKLGRQHPKKHDTNLKTAMRQFLGPKNYKGEYVMNKYFTVPTNHVP
NYIKPDLERGQSLEHPVTKKPLQLRYDGTLGPPPVENKRLQNIFKDRLLQPFPSNPHCKT
NYVLSPQLKQSIFEEITVEGLSAQQVSQKYGLKIPRVEAIVKLVSVENSWNRRNRVSSDL
KTMDETLYRMFPVFDSDASFKRENLSEIPVPQKTLASRFLTIAESEPFGPVDAAHVLELE
PAVETLRNLSTVGEHSSGHQQSTNKNTKVIYGELVEGERSQYKFTNAKVGKVGYRYGSGN
RDNKKDRRIGFNKLGQMVYI

Sequence of entity 7 (AG), FASTA

>8UX4_7 Small ribosomal subunit protein mS23 (chains AG)
MKIQTNAVNVLQRTSAYLKSGLLKETPAWYNVVASIPPSTKFTREPRFKNPSNGHIIGKL
VDVTEQPHANNKGLYKTRPNSSDKRVGVKRLYRPPKLTYVEDRLRSLFYKQHPWELSRPK
ILVENEIGDENYDWSHMLQIGRPLDGESVIQRTMYLIKTKQYGDMVEAYDHARYEFYALR
MQEETEQQVALEEAEMFGSLFGVSAIEHGIQKEQEVLDVWEKKVVEETELMAARTS

Sequence of entity 8 (AH), FASTA

>8UX4_8 Small ribosomal subunit protein mS26 (chains AH)
MGKGAAKYGFKSGVFPTTRSILKSPTTKQTDIINKVKSPKPKGVLGIGYAKGVKHPKGSH
RLSPKVNFIDVDNLIAKTVAEPQSIKSSNGSAQKVRLQKAELRRKFLIEAFRKEEARLLH
KHEYLQKRTKELEKAKELELEKLNKEKSSDLTIMTLDKMMSQPLLRNRSPEESELLKLKR
NYNRSLLNFQAHKKKLNELLNLYHVANEFIVTESQLLKKIDKVFNDETEEFTDA

Sequence of entity 9 (AI), FASTA

>8UX4_9 Small ribosomal subunit protein mS29 (chains AI)
SSAKRVTPGSLYKNWTNTTHTAQLQQTAVPLALPIFNFDDISKTLNKVVSYSNKQYKSLH
HLGSFKKSQFNELFQKPVCLVREDATNSFLKKLVSHPVKKFIITGEPGVGKTVLLSQAHA
YAVDSKQIIINISYPELFLNGRNDFSYDDDLKLFIQPMYLKKLIRKILKANDPALLKSIE
LSKDYKFSNANPKNASVKPFVTLNKTKNTVLDLLSVMTHPHNRGKLMKAIIDELSVQSKV
PIMFTVDNFSKVLTTAYSAYRNTENKQIYSLDLQMGKLMMDIISGETKFANGESSTILAI
SGVDRTNKTLPVALGKIPVDPYVTRYHYEPKFVELLQKGNVTEFEVPKLNKQEVNELIDY
YKQSNVLLDKDITGKKWENLIDEKYFLSGNGNPRELLKSLVLSHR

Sequence of entity 10 (AJ), FASTA

>8UX4_10 Small ribosomal subunit protein mS33 (chains AJ)
MNVPKARLLKVAELSAKIFDQNFNPSGIRTGSKILNERLKGPSVASYYGNPDILKFRHLK
TLYPDIEFVDLEEQYRLSMVEAKKRRGKGAPKKMKK

Sequence of entity 11 (AK), FASTA

>8UX4_11 Small ribosomal subunit protein mS35 (chains AK)
SADLYMHPEKWKGLPPQRILELYWERMARLGSEYKPNKDELNALLTTSEYSNVPVNDIKK
LYHRGEQGAIDIKGGNVNRDNSLRPFMFDELPSQAQELVAQHREQRFYNRLAAYELPLLA
QYRQEYKRPSPESHPVTYRYTSYVGEEHPNSRKVVLSVKTKELGLEEKSLHKFRILARSR
YDHTTDIFKMSSDKFEHASQNARYLHDILQRLLAESKDLTEDDFSDVPLDTRHTIAKSLR
KKKRDYEFPEHWKRPEDAPKKKFD

Sequence of entity 12 (AL), FASTA

>8UX4_12 Small ribosomal subunit rRNA (chains AL)
UAAGAAUAUGAUGUUGGUUCAGAUUAAGCGCUAAAUAAGGACAUGACACAUGCGAAUCAU
ACGUUUAUUAUUGAGAUAAUAAAUAUGUGGUGUAAACGUGAGUAAUUUUAUUAGGAAUUA
AUGAACUAUAGAAUAAGCUAAAUACUUAAUAUUAUAUAAAAAAUUUAUAUAAUAAAAAGG
AUAUAUAUAUAUAUAUUUAUCUAUAGUCAAGCCAAUAAUGGUUUAGGUAGUAGGUUUAUU
AAGAGUUAAACCUAGCCAACGAUCCAUAAUCGAUAAUGAAAGUUAGAACGAUCACGUUGA
CUCUGAAAUAUAGUCAAUAUCUAUAAGAUACAGCAGUGAGGAAUAUUGGACAAUGAUCGA
AAGAUUGAUCCAGUUACUUAUUAGGAUGAUAUAUAUAUAUAUAUAAAUUGAUUAAAAAUA
AAAUCCAUAAAUAAUUAAAAUAAUGAUAUUAAUUACCAUAUAUUUAUAUGGAUAUAUAUA
UAUUUUAAUAGUCCUGACUAAUAUUUGUGCCAGCAGUCGCGGUAACACAAAGAGGGCGAG
CGUUAAUCAUAAUGGUUUAAAGGAUCCGUAGAAUGAAUUAUAUAUAAUUUAGAGUUAAUA
AAAUUAAUUAAAGAAUUAUAAUAGUAAAGAUGAAAUAAUAAUAAUAAUUAUAAGACUAAU
AUAUGUGAAAAUAUUAAUUAAAUAUUAACUGACAUUGAGGGAUUAAAACUAGAGUAGCGA
AACGGAUUCGAUACCCGUGUAGUUCUAGUAGUAAACUAUGAAUACAAUUAUUUAUAAUAU
AUAUAUAAAUAAUAAAUGAAAAUGAAAGUAUUCCACCUGAAGAGUACGUUAGCAAUAAUG
AAACUCAAAACAAUAGACGGUUACAGACUUAAGCAGUGGAGCAUGUUAUUUAAUUCGAUA
AUCCACGACUAACCUUACCAUAUUUUGAAUAUUAUAAUAUUUAUUAUAUUACAGGCGUUA
CAUUGUUGUCUUUAGUUCGUGCUGCAAAGUUUUAGAUUAAGUUCAUAAACGAACAAAACU
CCAUAUAUAUAAUUUUAAUUAUAUAUAAUUUUAUAUUAUGAUCUAAUAUAAAGAAAGGAA
UUAAGACAAAUCAUAAUGAUCCUUAUAAUAUGGGUAAUAGACGUGCUAUAAUAAAAUGAU
AAUAAAAUUAUAUAAAAUAUAUUUAAUUAUAUUUAAUUAAUAAUAUAAAACAUUUUAAUU
UUUAAUAUAUUUUUUUAUUAUAAAUAUGAAUUAUAAUCUGAAAUUCGAUUAUAUGAAAAA
AGAAUUGCUAGUAAUACGUAAAUUAGUAUGUUACGGUGAAUAUUCUAACUGUUUCGCACU
AAUCACUCAUCACGCGUUGAAACAUAUUAUUAUCUUAUUAUUUAUAUAAUAUUUUUUAAU
AAAUAUUAUUAAUUUAUAUUUAUUUAUAUCAGAAAUAAUAUGAAUUAAUGCGAAGUUGAA
AUACAGUUACCGUAGGGGAACCUGCGGUGGGCUUAUAAAUAUCUUAAAUAUUCUUACA

Primary citation

The context-dependent plasticity and polymorphism of yeast mitochondrial ribosome. Yu, Z., Zheng, F., Zhou, C. To be published.

Other PDB entries of the same protein (UniProt P32344 (AlphaFold model), which also has an AlphaFold model), best resolution first:

8OM4 2.32 Å, Small subunit of yeast mitochondrial ribosome.
8OM2 2.57 Å, Small subunit of yeast mitochondrial ribosome in complex with METTL17/Rsm22.
8OM3 2.87 Å, Small subunit of yeast mitochondrial ribosome in complex with IF3/Aim23.
9HM0 3.0 Å, Translational activator Aep3 in complex with mRNA and the yeast mitochondrial ribosome
8UXA 3.2 Å, Glucose treated mitochondrial ribosome of saccharomyces cerevisiae class I
9HLZ 3.2 Å, Translational activators Aep1, Aep2 and Atp25 in complex with mRNA and the yeast…
5MRC 3.25 Å, Structure of the yeast mitochondrial ribosome - Class A
5MRE 3.75 Å, Structure of the yeast mitochondrial ribosome - Class B
5MRF 4.97 Å, Structure of the yeast mitochondrial ribosome - Class C

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