5XN9

Crystal structure of a secretary abundant heat soluble (SAHS) protein from Ramazzottius varieornatus (from monomer sample)

PDB DOI: https://doi.org/10.2210/pdb5XN9/pdb

Classification: LIPID TRANSPORT
Organism(s): Ramazzottius varieornatus
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 2017-05-19 Released: 2017-07-26
Deposition Author(s): Fukuda, Y., Miura, Y., Mizohata, E., Inoue, T.
Funding Organization(s): JSPS

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.45 Å
R-Value Free: 0.172
R-Value Work: 0.145
R-Value Observed: 0.146

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Structural insights into a secretory abundant heat-soluble protein from an anhydrobiotic tardigrade, Ramazzottius varieornatus

Fukuda, Y., Miura, Y., Mizohata, E., Inoue, T.

(2017) FEBS Lett 591: 2458-2469

PubMed: 28703282 Search on PubMed
DOI: https://doi.org/10.1002/1873-3468.12752
Primary Citation of Related Structures:
5XN9, 5XNA

PubMed Abstract:
Upon stopping metabolic processes, some tardigrades can undergo anhydrobiosis. Secretory abundant heat-soluble (SAHS) proteins have been reported as candidates for anhydrobiosis-related proteins in tardigrades, which seem to protect extracellular components and/or secretory organelles. We determined structures of a SAHS protein from Ramazzottius varieornatus (RvSAHS1), which is one of the toughest tardigrades. RvSAHS1 shows a β-barrel structure similar to fatty acid-binding proteins (FABPs), in which hydrophilic residues form peculiar hydrogen bond networks, which would provide RvSAHS1 with better tolerance against dehydration. We identified two putative ligand-binding sites: one that superimposes on those of some FABPs and the other, unique to and conserved in SAHS proteins. These results indicate that SAHS proteins constitute a new FABP family.

Organizational Affiliation

Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan.

Macromolecule Content

Total Structure Weight: 33.75 kDa
Atom Count: 2,816
Modelled Residue Count: 275
Deposited Residue Count: 276
Unique protein chains: 1

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SAHS1	A, B	138	Ramazzottius varieornatus	Mutation(s): 0 Gene Names: SAHS1, RvY_02423-1, RvY_02423.1, RvY_02423
UniProt
Find proteins for J7MFT5 (Ramazzottius varieornatus) Explore J7MFT5 Go to UniProtKB: J7MFT5
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	J7MFT5
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ZN Query on ZN Download Ideal Coordinates CCD File SDF format, chain D [auth A] SDF format, chain N [auth B] SDF format, chain O [auth B] SDF format, chain P [auth B] MOL2 format, chain D [auth A] MOL2 format, chain N [auth B] MOL2 format, chain O [auth B] MOL2 format, chain P [auth B] mmCIF format, chain D [auth A] mmCIF format, chain N [auth B] mmCIF format, chain O [auth B] mmCIF format, chain P [auth B]	D [auth A], N [auth B], O [auth B], P [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N		Interactions Focus chain D [auth A] Focus chain N [auth B] Focus chain O [auth B] Focus chain P [auth B] Interactions & Density Focus chain D [auth A] Focus chain N [auth B] Focus chain O [auth B] Focus chain P [auth B]
EDO Query on EDO Download Ideal Coordinates CCD File SDF format, chain F [auth A] SDF format, chain G [auth A] SDF format, chain H [auth A] SDF format, chain I [auth A] SDF format, chain J [auth A] SDF format, chain K [auth A] SDF format, chain R [auth B] SDF format, chain S [auth B] SDF format, chain T [auth B] SDF format, chain U [auth B] SDF format, chain V [auth B] SDF format, chain W [auth B] SDF format, chain X [auth B] MOL2 format, chain F [auth A] MOL2 format, chain G [auth A] MOL2 format, chain H [auth A] MOL2 format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain K [auth A] MOL2 format, chain R [auth B] MOL2 format, chain S [auth B] MOL2 format, chain T [auth B] MOL2 format, chain U [auth B] MOL2 format, chain V [auth B] MOL2 format, chain W [auth B] MOL2 format, chain X [auth B] mmCIF format, chain F [auth A] mmCIF format, chain G [auth A] mmCIF format, chain H [auth A] mmCIF format, chain I [auth A] mmCIF format, chain J [auth A] mmCIF format, chain K [auth A] mmCIF format, chain R [auth B] mmCIF format, chain S [auth B] mmCIF format, chain T [auth B] mmCIF format, chain U [auth B] mmCIF format, chain V [auth B] mmCIF format, chain W [auth B] mmCIF format, chain X [auth B]	F [auth A] G [auth A] H [auth A] I [auth A] J [auth A] F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], R [auth B], S [auth B], T [auth B], U [auth B], V [auth B], W [auth B], X [auth B]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain R [auth B] Focus chain S [auth B] Focus chain T [auth B] Focus chain U [auth B] Focus chain V [auth B] Focus chain W [auth B] Focus chain X [auth B] Interactions & Density Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain R [auth B] Focus chain S [auth B] Focus chain T [auth B] Focus chain U [auth B] Focus chain V [auth B] Focus chain W [auth B] Focus chain X [auth B]
ACY Query on ACY Download Ideal Coordinates CCD File SDF format, chain L [auth A] SDF format, chain Y [auth B] SDF format, chain Z [auth B] MOL2 format, chain L [auth A] MOL2 format, chain Y [auth B] MOL2 format, chain Z [auth B] mmCIF format, chain L [auth A] mmCIF format, chain Y [auth B] mmCIF format, chain Z [auth B]	L [auth A], Y [auth B], Z [auth B]	ACETIC ACID C₂ H₄ O₂ QTBSBXVTEAMEQO-UHFFFAOYSA-N		Interactions Focus chain L [auth A] Focus chain Y [auth B] Focus chain Z [auth B] Interactions & Density Focus chain L [auth A] Focus chain Y [auth B] Focus chain Z [auth B]
CL Query on CL Download Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain Q [auth B] MOL2 format, chain E [auth A] MOL2 format, chain Q [auth B] mmCIF format, chain E [auth A] mmCIF format, chain Q [auth B]	E [auth A], Q [auth B]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M		Interactions Focus chain E [auth A] Focus chain Q [auth B] Interactions & Density Focus chain E [auth A] Focus chain Q [auth B]
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain M [auth B] MOL2 format, chain C [auth A] MOL2 format, chain M [auth B] mmCIF format, chain C [auth A] mmCIF format, chain M [auth B]	C [auth A], M [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain C [auth A] Focus chain M [auth B] Interactions & Density Focus chain C [auth A] Focus chain M [auth B]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.45 Å
R-Value Free: 0.172
R-Value Work: 0.145
R-Value Observed: 0.146
Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.866	α = 90
b = 57.505	β = 90
c = 111.723	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Released Date: 2017-07-26

Deposition Author(s):

Funding Organization	Location	Grant Number
JSPS	Japan	16H06940
JSPS	Japan	17K17862

Revision History (Full details and data files)

Version 1.0: 2017-07-26
Type: Initial release
Version 1.1: 2017-09-06
Changes: Database references
Version 1.2: 2019-08-28
Changes: Data collection
Version 1.3: 2024-03-27
Changes: Data collection, Database references, Derived calculations