1BR1: Myosin

Smooth muscle myosin motor domain-essential light chain complex with MGADP.ALF4 bound at the active site. Determined by X-ray diffraction at 3.5 Å resolution. Released 9 Sept 1998.

Method: X-ray diffraction
Resolution: 3.5 Å
Organism: Gallus gallus
Chains: 8
Atoms: 30,132
Mol. weight: 444.5 kDa
Ligands: ADP, ALF, MG
Released: 9 Sept 1998

Explore 1BR1 in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

1BR1 contains 190 α-helices and 112 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: 36 helices, 26 β-strands

Element	Residues	Length	Sheet
α-helix	10-12	3
α-helix	23-28	6
β-strand	34-37	4	1
β-strand	45-53	9	1
β-strand	56-61	6	1
β-strand	67-71	5	1
β-strand	76-77	2	1
α-helix	78-80	3
α-helix	81-83	3
β-strand	88	1	2
α-helix	99-110	12
β-strand	114-117	4	2
β-strand	120-124	5	2
α-helix	135-141	7
α-helix	153-167	15
β-strand	171-174	4	3
α-helix	185-197	13
α-helix	200-201	2
α-helix	220-231	12
β-strand	234	1	4
β-strand	236-239	4	4
β-strand	242-246	5	4
β-strand	250-256	7	3
β-strand	262-269	8	3
α-helix	275-277	3
α-helix	289-296	8
α-helix	299-304	6
α-helix	328-342	15
α-helix	346-361	16
β-strand	368	1	5
β-strand	377	1	5
α-helix	382-390	9
α-helix	395-403	9
α-helix	420-446	27
β-strand	459-465	7	3
α-helix	466-468	3
β-strand	475	1	6
α-helix	477-494	18
α-helix	495-499	5
α-helix	500-508	9
α-helix	522-526	5
α-helix	537-543	7
α-helix	552-562	11
β-strand	569-571	3	6
β-strand	580-584	5	6
β-strand	589-593	5	6
α-helix	597-602	6
α-helix	607-614	8
α-helix	619-625	7
α-helix	659-674	16
β-strand	678-681	4	3
β-strand	684-685	2	2
α-helix	698-707	10
α-helix	710-719	10
β-strand	723-726	4	7
α-helix	727-733	7
α-helix	749-758	10
β-strand	769	1	7
β-strand	773-776	4	7
α-helix	777	1
α-helix	780-791	12
α-helix	793-819	27

Chains B, D and H: 11 helices, 2 β-strands

Element	Residues	Length	Sheet
α-helix	5-16	12
α-helix	31-37	7
α-helix	44-48	5
α-helix	49-51	3
α-helix	56-59	4
α-helix	66-77	12
α-helix	85-92	8
α-helix	93-95	3
β-strand	103-104	2	8
α-helix	107-111	5
α-helix	121-128	8
β-strand	137-138	2	8
α-helix	140-149	10

Chain C: 37 helices, 26 β-strands

Element	Residues	Length	Sheet
α-helix	10-12	3
α-helix	23-28	6
β-strand	34-37	4	9
β-strand	45-53	9	9
β-strand	56-60	5	9
β-strand	67-71	5	9
β-strand	76-77	2	9
α-helix	78-80	3
α-helix	81-83	3
β-strand	88	1	10
α-helix	99-110	12
β-strand	114-117	4	10
β-strand	120-124	5	10
α-helix	135-141	7
α-helix	153-167	15
β-strand	171-174	4	11
α-helix	185-197	13
α-helix	200-201	2
α-helix	220-231	12
β-strand	234	1	12
β-strand	236-239	4	12
β-strand	242-246	5	12
β-strand	250-256	7	11
β-strand	262-269	8	11
α-helix	275-277	3
α-helix	289-296	8
α-helix	299-304	6
α-helix	328-342	15
α-helix	346-361	16
β-strand	368	1	13
β-strand	377	1	13
α-helix	382-390	9
α-helix	395-403	9
α-helix	422-446	25
β-strand	459-465	7	11
α-helix	466-468	3
β-strand	475	1	14
α-helix	477-494	18
α-helix	495-499	5
α-helix	500-507	8
α-helix	522-526	5
α-helix	537-543	7
α-helix	552-562	11
β-strand	569-571	3	14
β-strand	580-584	5	14
β-strand	589-593	5	14
α-helix	597-600	4
α-helix	607-614	8
α-helix	619-624	6
α-helix	659-674	16
β-strand	678-681	4	11
β-strand	684-685	2	10
α-helix	698-707	10
α-helix	710-719	10
β-strand	723-726	4	15
α-helix	727-733	7
α-helix	735-737	3
α-helix	749-758	10
β-strand	767-769	3	15
β-strand	773-776	4	15
α-helix	777	1
α-helix	780-791	12
α-helix	793-819	27

Chain E: 37 helices, 26 β-strands

Element	Residues	Length	Sheet
α-helix	10-12	3
α-helix	23-28	6
β-strand	34-37	4	17
β-strand	45-53	9	17
β-strand	56-61	6	17
β-strand	67-71	5	17
β-strand	76-77	2	17
α-helix	78-80	3
α-helix	81-83	3
β-strand	88	1	18
α-helix	99-110	12
β-strand	114-117	4	18
β-strand	120-124	5	18
α-helix	135-141	7
α-helix	153-167	15
β-strand	171-174	4	19
α-helix	185-197	13
α-helix	200-201	2
α-helix	220-231	12
β-strand	234	1	20
β-strand	236-239	4	20
β-strand	242-246	5	20
β-strand	250-256	7	19
β-strand	262-269	8	19
α-helix	275-277	3
α-helix	289-296	8
α-helix	299-304	6
α-helix	328-342	15
α-helix	346-361	16
β-strand	368	1	21
β-strand	377	1	21
α-helix	382-390	9
α-helix	395-403	9
α-helix	420-446	27
β-strand	459-465	7	19
α-helix	466-468	3
β-strand	475	1	22
α-helix	477-494	18
α-helix	495-499	5
α-helix	500-507	8
α-helix	522-526	5
α-helix	537-543	7
α-helix	552-562	11
β-strand	569-571	3	22
β-strand	580-584	5	22
β-strand	589-593	5	22
α-helix	597-600	4
α-helix	607-614	8
α-helix	619-624	6
α-helix	659-674	16
β-strand	678-681	4	19
β-strand	684-685	2	18
α-helix	698-707	10
α-helix	710-719	10
β-strand	723-726	4	23
α-helix	727-733	7
α-helix	735-737	3
α-helix	749-758	10
β-strand	769	1	23
β-strand	773-776	4	23
α-helix	777	1
α-helix	780-791	12
α-helix	793-819	27

Chain F: 10 helices, 2 β-strands

Element	Residues	Length	Sheet
α-helix	5-16	12
α-helix	31-37	7
α-helix	44-48	5
α-helix	49-51	3
α-helix	56-59	4
α-helix	66-77	12
α-helix	88-92	5
β-strand	103-104	2	24
α-helix	107-111	5
α-helix	121-128	8
β-strand	137-138	2	24
α-helix	140-149	10

Chain G: 37 helices, 26 β-strands

Element	Residues	Length	Sheet
α-helix	10-12	3
α-helix	23-28	6
β-strand	34-37	4	25
β-strand	45-53	9	25
β-strand	56-61	6	25
β-strand	67-71	5	25
β-strand	76-77	2	25
α-helix	78-80	3
α-helix	81-83	3
β-strand	88	1	26
α-helix	99-110	12
β-strand	114-117	4	26
β-strand	120-124	5	26
α-helix	135-141	7
α-helix	153-167	15
β-strand	171-174	4	27
α-helix	185-197	13
α-helix	200-201	2
α-helix	220-231	12
β-strand	234	1	28
β-strand	236-239	4	28
β-strand	242-246	5	28
β-strand	250-256	7	27
β-strand	262-269	8	27
α-helix	275-277	3
α-helix	289-296	8
α-helix	299-304	6
α-helix	328-342	15
α-helix	346-361	16
β-strand	368	1	29
β-strand	377	1	29
α-helix	382-390	9
α-helix	395-403	9
α-helix	420-446	27
β-strand	459-465	7	27
α-helix	466-468	3
β-strand	475	1	30
α-helix	477-494	18
α-helix	495-499	5
α-helix	500-507	8
α-helix	522-526	5
α-helix	537-543	7
α-helix	552-562	11
β-strand	569-571	3	30
β-strand	580-584	5	30
β-strand	589-593	5	30
α-helix	597-600	4
α-helix	607-614	8
α-helix	619-625	7
α-helix	659-674	16
β-strand	678-681	4	27
β-strand	684-685	2	26
α-helix	698-707	10
α-helix	710-719	10
β-strand	723-726	4	31
α-helix	727-733	7
α-helix	735-737	3
α-helix	749-758	10
β-strand	767-769	3	31
β-strand	773-776	4	31
α-helix	777	1
α-helix	780-791	12
α-helix	793-819	27

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Myosin	A, C, E, G	protein	820	Gallus gallus	P10587 (AlphaFold model)
Myosin	B, D, F, H	protein	150	Gallus gallus	P02607 (AlphaFold model)

Sequence of entity 1 (A, C, E, G), FASTA

>1BR1_1 MYOSIN (chains A, C, E, G)
AQKPLSDDEKFLFVDKNFVNNPLAQADWSAKKLVWVPSEKHGFEAASIKEEKGDEVTVEL
QENGKKVTLSKDDIQKMNPPKFSKVEDMAELTCLNEASVLHNLRERYFSGLIYTYSGLFC
VVINPYKQLPIYSEKIIDMYKGKKRHEMPPHIYAIADTAYRSMLQDREDQSILCTGESGA
GKTENTKKVIQYLAVVASSHKGKKDTSITQGPSFSYGELEKQLLQANPILEAFGNAKTVK
NDNSSRFGKFIRINFDVTGYIVGANIETYLLEKSRAIRQAKDERTFHIFYYLIAGASEQM
RNDLLLEGFNNYTFLSNGHVPIPAQQDDEMFQETLEAMTIMGFTEEEQTSILRVVSSVLQ
LGNIVFKKERNTDQASMPDNTAAQKVCHLMGINVTDFTRSILTPRIKVGRDVVQKAQTKE
QADFAIEALAKAKFERLFRWILTRVNKALDKTKRQGASFLGILDIAGFEIFEINSFEQLC
INYTNEKLQQLFNHTMFILEQEEYQREGIEWNFIDFGLDLQPCIELIERPTNPPGVLALL
DEECWFPKATDTSFVEKLIQEQGNHAKFQKSKQLKDKTEFCILHYAGKVTYNASAWLTKN
MDPLNDNVTSLLNQSSDKFVADLWKDVDRIVGLDQMAKMTESSLPSASKTKKGMFRTVGQ
LYKEQLTKLMTTLRNTNPNFVRCIIPNHEKRAGKLDAHLVLEQLRCNGVLEGIRICRQGF
PNRIVFQEFRQRYEILAANAIPKGFMDGKQACILMIKALELDPNLYRIGQSKIFFRTGVL
AHLEEERDLKITDVIIAFQAQCRGYLARKAFAKRQQQLGS

Sequence of entity 2 (B, D, F, H), FASTA

>1BR1_2 MYOSIN (chains B, D, F, H)
CDFSEEQTAEFKEAFQLFDRTGDGKILYSQCGDVMRALGQNPTNAEVMKVLGNPKSDEMN
LKTLKFEQFLPMMQTIAKNKDQGCFEDYVEGLRVFDKEGNGTVMGAEIRHVLVTLGEKMT
EEEVEQLVAGHEDSNGCINYEELVRMVLSG

Ligands and cofactors

ID	Name	Formula	Copies
ADP	Adenosine-5'-diphosphate	C10 H15 N5 O10 P2	4
ALF	Tetrafluoroaluminate ion	Al F4	4
MG	Magnesium ion	Mg	4

Primary citation

Crystal structure of a vertebrate smooth muscle myosin motor domain and its complex with the essential light chain: visualization of the pre-power stroke state. Dominguez, R., Freyzon, Y., Trybus, K.M. et al. Cell (1998) 94:559-571. DOI 10.1016/S0092-8674(00)81598-6 · PubMed

Other PDB entries of the same protein (UniProt P10587 (AlphaFold model), which also has an AlphaFold model), best resolution first:

5M05 2.67 Å, Chicken smooth muscle myosin motor domain co-crystallized with the specific CK-571…
5T45 2.8 Å, Chicken smooth muscle myosin motor domain co-crystallized with the specific CK-571…
1BR2 2.9 Å, Smooth muscle myosin motor domain complexed with MGADP.ALF4
7MF3 3.4 Å, Structure of the autoinhibited state of smooth muscle myosin-2
1BR4 3.62 Å, Smooth muscle myosin motor domain-essential light chain complex with MGADP.BEF3 bound at…
6BIH 6.0 Å, The Structure of the Actin-Smooth Muscle Myosin Motor Domain Complex in the Rigor State
8SYF 19.0 Å, Homology model of Acto-HMM complex in ADP-state. Chicken smooth muscle HMM and chicken…
1I84 20.0 Å, cryo-EM structure of the heavy meromyosin subfragment of chicken gizzard smooth muscle…
3DTP 20.0 Å, Tarantula heavy meromyosin obtained by flexible docking to Tarantula muscle thick…
3J04 20.0 Å, EM structure of the heavy meromyosin subfragment of Chick smooth muscle Myosin with…

Browse structure collections

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