9Q2F: Rad55-Rad57-SHU-Rad51-Rad51

Rad55-Rad57-SHU-Rad51-Rad51 bound to ssDNA with AMP-PNP. Determined by electron microscopy at 3.06 Å resolution. Released 19 Aug 2026.

Method: Electron microscopy
Resolution: 3.06 Å
Organisms: Saccharomyces cerevisiae, synthetic construct
Chains: 9
Atoms: 16,471
Mol. weight: 321.46 kDa
Ligands: ADP, MG, ANP, ZN
Released: 19 Aug 2026

Explore 9Q2F in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

9Q2F contains 119 α-helices and 94 β-strands across 8 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 A: 14 helices, 15 β-strands

Element	Residues	Length	Sheet
β-strand	5-6	2	1
α-helix	7-13	7
α-helix	15-17	3
β-strand	18	1	2
α-helix	23-26	4
β-strand	33	1	2
α-helix	34	1
β-strand	37-42	6	3
α-helix	49-64	16
β-strand	73-78	6	3
α-helix	82-83	2
α-helix	85-89	5
α-helix	96-99	4
β-strand	102-106	5	3
α-helix	110-122	13
β-strand	129-135	7	3
α-helix	137-152	16
α-helix	154-157	4
α-helix	160-182	23
β-strand	185-190	6	3
β-strand	192-195	4	4
α-helix	231-232	2
β-strand	233-236	4	4
α-helix	249-252	4
β-strand	257-260	4	3
β-strand	263-265	3	3
β-strand	306-313	8	3
β-strand	339-344	6	3
β-strand	351-353	3	3

Chain B: 25 helices, 17 β-strands

Element	Residues	Length	Sheet
α-helix	16-19	4
α-helix	24-27	4
α-helix	32-40	9
α-helix	45-48	4
α-helix	53-60	8
α-helix	64-86	23
β-strand	99-100	2	5
α-helix	105-110	6
β-strand	115-116	2	5
β-strand	120-124	5	6
α-helix	131-141	11
α-helix	146-148	3
β-strand	154-159	6	6
α-helix	166-175	10
α-helix	177-180	4
α-helix	186-188	3
β-strand	189-193	5	6
α-helix	197-202	6
α-helix	203-207	5
α-helix	208-214	7
β-strand	219-225	7	6
α-helix	228-234	7
α-helix	240-263	24
β-strand	267-272	6	6
β-strand	274-276	3	7
α-helix	286-288	3
β-strand	292	1	4
α-helix	293-300	8
α-helix	305-317	13
α-helix	323-326	4
α-helix	328	1
β-strand	329	1	8
α-helix	331-338	8
β-strand	378	1	8
α-helix	379-382	4
β-strand	384-386	3	7
α-helix	389-393	5
β-strand	396-406	11	6
β-strand	431-440	10	6
β-strand	446-449	4	6
β-strand	450-453	4	9
β-strand	456-459	4	9

Chain C: 9 helices, 6 β-strands

Element	Residues	Length	Sheet
α-helix	3-5	3
β-strand	9-13	5	1
α-helix	17-28	12
β-strand	34-41	8	1
α-helix	48-54	7
α-helix	60-66	7
β-strand	69-73	5	1
α-helix	77-95	19
β-strand	110-117	8	1
α-helix	119-129	11
α-helix	132-151	20
β-strand	157-165	9	1
α-helix	171-176	6
α-helix	199-206	8
β-strand	210-211	2	1

Chain D: 16 helices, 11 β-strands

Element	Residues	Length	Sheet
α-helix	2-5	4
α-helix	7-8	2
β-strand	9-11	3	10
α-helix	12-14	3
β-strand	17-18	2	11
α-helix	23-26	4
α-helix	36-40	5
β-strand	43-47	5	12
α-helix	53-54	2
α-helix	57-60	4
β-strand	70-73	4	12
β-strand	89-92	4	12
α-helix	100-112	13
α-helix	114-120	7
β-strand	132-135	4	12
α-helix	138-141	4
α-helix	144	1
β-strand	145	1	13
α-helix	146	1
β-strand	152	1	13
α-helix	156-171	16
β-strand	174-179	6	12
α-helix	182-186	5
α-helix	188-190	3
α-helix	213-216	4
β-strand	221-226	6	12
β-strand	233-236	4	12

Chain E: 9 helices, 5 β-strands

Element	Residues	Length	Sheet
α-helix	3-11	9
β-strand	24-29	6	10
α-helix	31-37	7
α-helix	41-44	4
β-strand	47-48	2	11
α-helix	51-59	9
β-strand	61-66	6	10
α-helix	69-81	13
β-strand	90-94	5	10
α-helix	96-99	4
α-helix	105-120	16
β-strand	125-129	5	10
α-helix	131-133	3
α-helix	137-149	13

Chain F: 13 helices, 9 β-strands

Element	Residues	Length	Sheet
α-helix	8-15	8
α-helix	26-32	7
α-helix	40-49	10
β-strand	53-57	5	14
β-strand	58	1	15
α-helix	72-74	3
α-helix	76-79	4
β-strand	91-95	5	14
α-helix	103-104	2
β-strand	105-108	4	14
α-helix	109-111	3
β-strand	113-114	2	14
α-helix	117-128	12
α-helix	136-140	5
β-strand	141-143	3	16
β-strand	167-169	3	16
α-helix	177-185	9
α-helix	190-197	8
β-strand	204	1	14
α-helix	206-207	2
β-strand	208	1	15
α-helix	211-216	6

Chain G: 17 helices, 16 β-strands

Element	Residues	Length	Sheet
β-strand	82	1	17
α-helix	83-87	5
α-helix	93-100	8
β-strand	106	1	17
α-helix	107-112	6
α-helix	117-120	4
α-helix	126-139	14
β-strand	145-146	2	6
α-helix	147-152	6
α-helix	153-155	3
β-strand	159-160	2	18
α-helix	165-171	7
β-strand	175-176	2	18
β-strand	180-185	6	19
α-helix	191-201	11
α-helix	206-208	3
β-strand	214-219	6	19
α-helix	226-235	10
α-helix	240-243	4
β-strand	247-251	5	19
α-helix	255-271	17
β-strand	274-279	6	19
α-helix	286-289	4
α-helix	296-317	22
β-strand	320-325	6	19
β-strand	327-328	2	20
β-strand	343-344	2	20
α-helix	347-353	7
β-strand	356-362	7	19
β-strand	367-374	8	19
β-strand	382-388	7	19
β-strand	391-393	3	19
α-helix	397-399	3

Chain I: 16 helices, 15 β-strands

Element	Residues	Length	Sheet
β-strand	82	1	21
α-helix	83-86	4
α-helix	93-100	8
β-strand	106	1	21
α-helix	107-112	6
α-helix	115-118	4
α-helix	126-139	14
β-strand	145-146	2	19
α-helix	147-155	9
β-strand	159-160	2	22
α-helix	165-168	4
β-strand	175-176	2	22
β-strand	180-184	5	23
α-helix	191-194	4
α-helix	195-201	7
β-strand	215-219	5	23
α-helix	229-236	8
α-helix	240-242	3
α-helix	244-246	3
β-strand	247-251	5	23
α-helix	255-271	17
β-strand	276-278	3	23
α-helix	283-286	4
α-helix	297-317	21
β-strand	320-324	5	23
α-helix	348-351	4
β-strand	356-359	4	23
β-strand	361-364	4	24
β-strand	367-371	5	24
β-strand	382-388	7	24
β-strand	391-393	3	24

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Methylated-DNA--protein-cysteine methyltransferase,DNA repair protein RAD55	A	protein	631	Saccharomyces cerevisiae	E5BBQ0 (AlphaFold model), P38953 (AlphaFold model)
DNA repair protein RAD57	B	protein	460	Saccharomyces cerevisiae	P25301 (AlphaFold model)
Chromosome segregation in meiosis protein 2	C	protein	213	Saccharomyces cerevisiae	P40465 (AlphaFold model)
Platinum sensitivity protein 3	D	protein	281	Saccharomyces cerevisiae	Q12318
Suppressor of HU sensitivity involved in recombination protein 1	E	protein	150	Saccharomyces cerevisiae	P38751
Suppressor of hydroxyurea sensitivity protein 2	F	protein	262	Saccharomyces cerevisiae	C7GVQ9
DNA repair protein RAD51	G, I	protein	418	Saccharomyces cerevisiae	P25454
ssDNA (9-mer)	H	DNA	9	synthetic construct

Sequence of entity 1 (A), FASTA

>9Q2F_1 Methylated-DNA--protein-cysteine methyltransferase,DNA repair protein RAD55 (chains A)
MSAWSHPQFEKGGGSGGGSGGSAWSHPQFEKGSMDKDCEMKRTTLDSPLGKLELSGCEQG
LHRIIFLGKGTSAADAVEVPAPAAVLGGPEPLMQATAWLNAYFHQPEAIEEFPVPALHHP
VFQQESFTRQVLWKLLKVVKFGEVISYSHLAALAGNPAATAAVKTALSGNPVPILIPCHR
VVQGDLDVGGYEGGLAVKEWLLAHEGHRLGKPGLGGSENLYFQGSMSLGIPLSQLIVESP
KPLSSGITGLDEILNLGFQARSIYEIFGPPGIGKTNFGIQLVCNSLEGIQQSEINDDKIL
WIETFQEMPINILRERFQKFKIVEENVKRVRITKFGQLLYFFQNLFKLSQSVRYKLVIID
GFSQLVCDHLCTLSKRGGGMIDKTIHELKCRHLILIFTVMTKYTHSTGSTIIVLNDCMNT
AFQSNEFESLEEYYEILDDGSNFFVNSNNERRKNNVHILKSALVANIAMGSKDSTWEVFL
RDRIGLFRDWNEQVDETVFVKSKRVKASSSQSNEGCTTIKEMRINKRNFENLRIAIVFNL
HGEDRKREGRNLKRSRSSDDRNYIVKFDFDKATGQLRDIIDLKPDTANIASFPTLSTSSS
SCSQVFNNIDSNDNPLPNAEGKEEIIYDSEG

Sequence of entity 2 (B), FASTA

>9Q2F_2 DNA repair protein RAD57 (chains B)
MPRALSIKFDNTYMDLYDELPESKLLYDEEFSYLLDAVRQNGVCVVDFLTLTPKELARLI
QRSINEVFRFQQLLVHEYNEKYLEICEKNSISPDNGPECFTTADVAMDELLGGGIFTHGI
TEIFGESSTGKSQLLMQLALSVQLSEPAGGLGGKCVYITTEGDLPTQRLESMLSSRPAYE
KLGITQSNIFTVSCNDLINQEHIINVQLPILLERSKGSIKLVIIDSISHHLRVELQNKSF
RESQENKNYLDRMAEKLQILAHDYSLSVVVANQVGDKPLANSPVAHRTYVTDYDYQLGWL
VGWKNSTILYRQMNSLLGASSNNDEILSDDEDYMLIERVMSTVNDRNYDFFSKKKPPIIE
NKTVERNSSSPISRQSKKRKFDYRVPNLGLTWSNHVSTRILLQKSFKASTIIQRGEAHLY
KGGDSASFWQVKRTMKVVYSTFAKPGQIAYQITKRGIETA

Sequence of entity 3 (C), FASTA

>9Q2F_3 Chromosome segregation in meiosis protein 2 (chains C)
MEYEDLELITIWPSPTKNKLCQFIKQNLSKEHVVTQLFFIDATSSFPLSQFQKLVPPTLP
ENVRIYENIRINTCLDLEELSAITVKLLQILSMNKINAQRGTEDAVTEPLKIILYINGLE
VMFRNSQFKSSPQRSHELLRDTLLKLRVMGNDENENASIRTLLEFPKEQLLDYYLKKNNN
TRTSSVRSKRRRIKNGDSLAEYIWKYYADSLFE

Sequence of entity 4 (D), FASTA

>9Q2F_4 Platinum sensitivity protein 3 (chains D)
MSAWSHPQFEKGGGSGGGSGGSAWSHPQFEKSGENLYFQMEVLKNIRIYPLSNFITSTKN
YINLPNELRNLISEEQESKLGFLHIIESDFKPSVALQKLVNCTTGDEKILIIDIVSIWSQ
QKQRQHGAIYMNSLSCINITGLIVFLELLYDSPMDALRRCQVDNFNFQLRGIVIDNLSFL
NFESDKNYDVINLSKFEKLFKILRKLREFLGCWIITKSFPTDFYNGIENTLVDKWSIKRK
SGVTLYPTKLPDSYMKGMDLIIYREVVDGRPQYRRIAALEE

Sequence of entity 5 (E), FASTA

>9Q2F_5 Suppressor of HU sensitivity involved in recombination protein 1 (chains E)
MQFEERLQQLVESDWSLDQSSPNVLVIVLGDTARKYVELGGLKEHVTTNTVAGHVASRER
VSVVFLGRVKYLYMYLTRMQAQANGPQYSNVLVYGLWDLTATQDGPQQLRLLSLVLRQCL
SLPSKVEFYPEPPSSSVPARLLRFWDHIIR

Sequence of entity 6 (F), FASTA

>9Q2F_6 Suppressor of hydroxyurea sensitivity protein 2 (chains F)
MSAWSHPQFEKGGGSGGGSGGSAWSHPQFEKSGENLYFQGSKDVIEYSKLFAKLVNTNDD
TKLDDTIASFLYYMFPRELFIRAISLLESSDMFIYILDRVHNKEGNEHTSLIDVLVDEFY
KGSSNSLLEYRLIVKDTNDGAPPILVDIAHWFCSCEEFCKYFHEALEKTDEKEELHDVLI
NEVDDHLQFSDDRFAQLDPHSLSKQWYFKFDKVCCSHLLAFSILLRSSINVLKFFTVNSN
KVFVIAIDNIDEWLNLHINIVE

Sequence of entity 7 (G, I), FASTA

>9Q2F_7 DNA repair protein RAD51 (chains G, I)
MHHHHHHHHGENLYFQGSMSQVQEQHISESQLQYGNGSLMSTVPADLSQSVVDGNGNGSS
EDIEATNGSGDGGGLQEQAEAQGEMEDEAYDEAALGSFVPIEKLQVNGITMADVKKLRES
GLHTAEAVAYAPRKDLLEIKGISEAKADKLLNEAARLVPMGFVTAADFHMRRSELICLTT
GSKNLDTLLGGGVETGSITELFGEFRTGKSQLCHTLAVTCQIPLDIGGGEGKCLYIDTEG
TFRPVRLVSIAQRFGLDPDDALNNVAYARAYNADHQLRLLDAAAQMMSESRFSLIVVDSV
MALYRTDFSGRGELSARQMHLAKFMRALQRLADQFGVAVVVTNQVVAQVDGGMAFNPDPK
KPIGGNIMAHSSTTRLGFKKGKGCQRLCKVVDSPCLPEAECVFAIYEDGVGDPREEDE

Sequence of entity 8 (H), FASTA

>9Q2F_8 ssDNA (9-mer) (chains H)
TTTTTTTTT

Ligands and cofactors

ID	Name	Formula	Copies
ADP	Adenosine-5'-diphosphate	C10 H15 N5 O10 P2	1
MG	Magnesium ion	Mg	2
ANP	Phosphoaminophosphonic acid-adenylate ester	C10 H17 N6 O12 P3	1
ZN	Zinc ion	Zn	1

Primary citation

Yeast Rad55-Rad57-SHU paralog complex dynamically promotes Rad51 filament formation. Koo, C.W., Gore, S.K., Ro, S.Y. et al. Mol Cell (2026) 86:3639. DOI 10.1016/j.molcel.2026.06.045 · PubMed

Other PDB entries of the same protein (UniProt E5BBQ0 (AlphaFold model), which also has an AlphaFold model), best resolution first:

3KZY 1.9 Å, Crystal structure of SNAP-tag
6Y8P 2.3 Å, Crystal structure of SNAP-tag labeled with a benzyl-tetramethylrhodamine fluorophore
8TK7 2.53 Å, Myxococcus xanthus EncA protein shell with compartmentalized SNAP-tag cargo protein
9Q2H 2.74 Å, Rad55-Rad57-SHU homologous recombination complex
9Q2I 3.0 Å, Rad55-Rad57-SHU homologous recombination complex
9Q2C 3.06 Å, Rad55-Rad57-SHU-Rad51 bound to ssDNA with AMP-PNP
8DD7 3.3 Å, The Cryo-EM structure of Drosophila Cryptochrome in complex with Timeless
9Q2E 3.44 Å, Rad55-Rad57-SHU bound to ssDNA
9Q2L 3.7 Å, Rad55-Rad57(E161Q)-SHU-3xRad51 bound to ssDNA with ATP
6RLA 3.9 Å, Structure of the dynein-2 complex; motor domains
6SC2 3.9 Å, Structure of the dynein-2 complex; IFT-train bound model
6RLB 4.5 Å, Structure of the dynein-2 complex; tail domain

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