1B7T | pdb_00001b7t

Deposited: 1999-01-15 Released: 1999-05-12
Deposition Author(s): Houdusse, A., Kalabokis, V., Himmel, D., Szent-Gyorgyi, A.G., Cohen, C.

Experimental Data Snapshot

Starting Models: experimental
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wwPDB Validation 3D Report Full Report

This is version 1.4 of the entry. See complete history.

(1999) Cell 97: 459-470

PubMed Abstract:
The crystal structure of a proteolytic subfragment from scallop striated muscle myosin, complexed with MgADP, has been solved at 2.5 A resolution and reveals an unusual conformation of the myosin head. The converter and the lever arm are in very different positions from those in either the pre-power stroke or near-rigor state structures; moreover, in contrast to these structures, the SH1 helix is seen to be unwound. Here we compare the overall organization of the myosin head in these three states and show how the conformation of three flexible "joints" produces rearrangements of the four major subdomains in the myosin head with different bound nucleotides. We believe that this novel structure represents one of the prehydrolysis ("ATP") states of the contractile cycle in which the myosin heads stay detached from actin.

Organizational Affiliation

Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02254-9110, USA.

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN HEAVY CHAIN	A	835	Argopecten irradians	Mutation(s): 0
UniProt
Find proteins for P24733 (Argopecten irradians) Explore P24733 Go to UniProtKB: P24733
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P24733
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Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN REGULATORY LIGHT CHAIN	B [auth Y]	156	Argopecten irradians	Mutation(s): 0
UniProt
Find proteins for P13543 (Argopecten irradians) Explore P13543 Go to UniProtKB: P13543
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P13543
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Reference Sequence

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN ESSENTIAL LIGHT CHAIN	C [auth Z]	156	Argopecten irradians	Mutation(s): 0
UniProt
Find proteins for P07291 (Argopecten irradians) Explore P07291 Go to UniProtKB: P07291
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P07291
Sequence Annotations Expand
Reference Sequence

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ADP Query on ADP Download:Ideal Coordinates CCD File SDF format, chain E [auth A] MOL2 format, chain E [auth A] mmCIF format, chain E [auth A]	E [auth A]	ADENOSINE-5'-DIPHOSPHATE C₁₀ H₁₅ N₅ O₁₀ P₂ XTWYTFMLZFPYCI-KQYNXXCUSA-N		Interactions Focus chain E [auth A]
CA Query on CA Download:Ideal Coordinates CCD File SDF format, chain G [auth Z] MOL2 format, chain G [auth Z] mmCIF format, chain G [auth Z]	G [auth Z]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N		Interactions Focus chain G [auth Z]
MG Query on MG Download:Ideal Coordinates CCD File SDF format, chain F [auth Y] SDF format, chain D [auth A] MOL2 format, chain F [auth Y] MOL2 format, chain D [auth A] mmCIF format, chain F [auth Y] mmCIF format, chain D [auth A]	D [auth A], F [auth Y]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain D [auth A] Focus chain F [auth Y]