Annotations: 6XN3

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth F]	SCOP2B Superfamily	CRISPR-associated proteins	8106216	3001554	SCOP2B (2022-06-29)
D [auth H]	SCOP2B Superfamily	CRISPR-associated proteins	8106216	3001554	SCOP2B (2022-06-29)
E [auth G]	SCOP2B Superfamily	CRISPR-associated proteins	8106216	3001554	SCOP2B (2022-06-29)
F [auth I]	SCOP2B Superfamily	CRISPR-associated proteins	8106216	3001554	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	F_UNCLASSIFIED	e6xn3A5	A: alpha bundles	X: CRISPR RNA silencing complex Cmr2 subunit second helical domain (From Topology)	H: CRISPR RNA silencing complex Cmr2 subunit second helical domain (From Topology)	T: CRISPR RNA silencing complex Cmr2 subunit second helical domain	F: F_UNCLASSIFIED	ECOD (1.6)
A	HD	e6xn3A4	A: alpha complex topology	X: PDEase-like	H: HD-domain/PDEase-like (From Topology)	T: HD-domain/PDEase-like	F: HD	ECOD (1.6)
A	Cas10_III_2nd	e6xn3A1	A: a+b two layers	X: Alpha-beta plaits	H: Adenylyl and guanylyl cyclase catalytic domain-like	T: Adenylyl and guanylyl cyclase catalytic domain-like	F: Cas10_III_2nd	ECOD (1.6)
A	Cas10_III_1st	e6xn3A3	A: a+b two layers	X: Alpha-beta plaits	H: Adenylyl and guanylyl cyclase catalytic domain-like	T: Adenylyl and guanylyl cyclase catalytic domain-like	F: Cas10_III_1st	ECOD (1.6)
A	F_UNCLASSIFIED	e6xn3A2	A: a+b two layers	X: Csm1 ferredoxin-like domain (From Topology)	H: Csm1 ferredoxin-like domain (From Topology)	T: Csm1 ferredoxin-like domain	F: F_UNCLASSIFIED	ECOD (1.6)
B	RAMPs_1	e6xn3B1	A: a+b two layers	X: Alpha-beta plaits	H: CRISPR transcript (pre-crRNA) processing endoribonuclease-related (From Topology)	T: CRISPR transcript (pre-crRNA) processing endoribonuclease-related	F: RAMPs_1	ECOD (1.6)
B	Csm4	e6xn3B2	A: a+b two layers	X: Alpha-beta plaits	H: CRISPR transcript (pre-crRNA) processing endoribonuclease-related (From Topology)	T: CRISPR transcript (pre-crRNA) processing endoribonuclease-related	F: Csm4	ECOD (1.6)
C [auth F]	RAMPs	e6xn3F1	A: a+b two layers	X: Alpha-beta plaits	H: Cas7-related	T: CRISPR-associated protein Cas7/Csa2-related	F: RAMPs	ECOD (1.6)
D [auth H]	RAMPs	e6xn3H1	A: a+b two layers	X: Alpha-beta plaits	H: Cas7-related	T: CRISPR-associated protein Cas7/Csa2-related	F: RAMPs	ECOD (1.6)
E [auth G]	RAMPs	e6xn3G1	A: a+b two layers	X: Alpha-beta plaits	H: Cas7-related	T: CRISPR-associated protein Cas7/Csa2-related	F: RAMPs	ECOD (1.6)
F [auth I]	RAMPs	e6xn3I1	A: a+b two layers	X: Alpha-beta plaits	H: Cas7-related	T: CRISPR-associated protein Cas7/Csa2-related	F: RAMPs	ECOD (1.6)
G [auth J]	RAMPs	e6xn3J1	A: a+b two layers	X: Alpha-beta plaits	H: CRISPR transcript (pre-crRNA) processing endoribonuclease-related (From Topology)	T: CRISPR transcript (pre-crRNA) processing endoribonuclease-related	F: RAMPs	ECOD (1.6)
I [auth C]	F_UNCLASSIFIED	e6xn3C1	A: alpha duplicates or obligate multimers	X: Crispr-associated protein Csm2 (From Topology)	H: Crispr-associated protein Csm2 (From Topology)	T: Crispr-associated protein Csm2	F: F_UNCLASSIFIED	ECOD (1.6)
J [auth D]	F_UNCLASSIFIED	e6xn3D1	A: alpha duplicates or obligate multimers	X: Crispr-associated protein Csm2 (From Topology)	H: Crispr-associated protein Csm2 (From Topology)	T: Crispr-associated protein Csm2	F: F_UNCLASSIFIED	ECOD (1.6)
K [auth E]	F_UNCLASSIFIED	e6xn3E1	A: alpha duplicates or obligate multimers	X: Crispr-associated protein Csm2 (From Topology)	H: Crispr-associated protein Csm2 (From Topology)	T: Crispr-associated protein Csm2	F: F_UNCLASSIFIED	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF22335	Cas10/Cmr2, second palm domain (Cas10-Cmr2_palm2)	Cas10/Cmr2, second palm domain	This entry represents the second palm domain of Cas10 subunit (named Csm1 in Type III-A and Cmr2 in III-B systems) from type III CRISPR-Cas systems [6]. This domain contains a conserved GGDD motif that is important for DNA polymerase activity [1-5].	Domain
A	PF01966	HD domain (HD)	HD domain	-	Family
A	PF18211	Csm1 subunit domain B (Csm1_B)	Csm1 subunit domain B	This domain is found in the Csm1 subunit of the Csm complex found in Thermococcus onnurineus. Csm is a type III-A CRISPR-Cas system, which is an RNA-guided immune defense mechanism that detects and destroys foreign DNA or RNA. This domain is known as ...	This domain is found in the Csm1 subunit of the Csm complex found in Thermococcus onnurineus. Csm is a type III-A CRISPR-Cas system, which is an RNA-guided immune defense mechanism that detects and destroys foreign DNA or RNA. This domain is known as domain A and is positioned side by side with domain C. Both domain A and domain C adopt the BABBA topology. Domain A interacts primarily with domain B [1].	Domain
A	PF20824	CRISPR RNA silencing complex Cmr2 subunit, second helical domain (Cmr2_hel_dom2)	CRISPR RNA silencing complex Cmr2 subunit, second helical domain	The prokaryotic CRISPR RNA-Cas protein (Cmr) complex provides protection against mobile genetic elements by cleaving foreign RNA. Its largest subunit is Cmr2. This protein shows a N-terminal HD (histidine-aspartate) domain, two RRM domains resembling ...	The prokaryotic CRISPR RNA-Cas protein (Cmr) complex provides protection against mobile genetic elements by cleaving foreign RNA. Its largest subunit is Cmr2. This protein shows a N-terminal HD (histidine-aspartate) domain, two RRM domains resembling adenylate cyclase and two alpha-helical domains. This entry represents the second alpha-helical domain. It is similar to the small subunit Cmr5, which contains six alpha-helices and two helical insertions that fold into a single globular structure [1-5]. This domain is also found in Cas10 proteins from bacteria [6].	Domain
B	PF17953	CRISPR Csm4 C-terminal domain (Csm4_C)	CRISPR Csm4 C-terminal domain	Clustered, regularly interspaced, short palindromic repeat (CRISPR) loci play a pivotal role in the prokaryotic host defense system against invading genetic materials. The CRISPR loci are transcribed to produce CRISPR RNAs (crRNAs), which form interf ...	Clustered, regularly interspaced, short palindromic repeat (CRISPR) loci play a pivotal role in the prokaryotic host defense system against invading genetic materials. The CRISPR loci are transcribed to produce CRISPR RNAs (crRNAs), which form interference complexes with CRISPR-associated (Cas) proteins to target the invading nucleic acid for degradation. The interference complex of the type III-A CRISPR-Cas system is composed of five Cas proteins (Csm1-Csm5) and a crRNA, and targets invading DNA. This entry represents the C-terminal domain found in Csm4. Csm4 structurally resembles Cmr3, a component of the type III-B CRISPR-Cas interference complex. Studies indicate that Csm3-Csm4 complex binds single-stranded RNA in a non-sequence-specific manner. Structural analysis show , Csm3 and Csm4 have one and two ferredoxin-like folds (also known as an RRM-like fold), respectively. The long beta-hairpin inserted into the C-terminal ferredoxin-like fold of Csm4, is well-conserved in the Cmr3 structure. The corresponding beta-hairpin of Cmr3 binds the D1 domain of Cmr2, as observed in the Cmr2-Cmr3 complex structure. Furthermore, it is suggested that the hairpin of Csm4 is responsible for the interaction with Csm1 (ortholog of Cmr2) [1].	Domain
B	PF03787	RAMP superfamily (RAMPs)	RAMP superfamily	-	Family
C [auth F], D [auth H], E [auth G], F [auth I]	PF03787	RAMP superfamily (RAMPs)	RAMP superfamily	-	Family
G [auth J]	PF03787	RAMP superfamily (RAMPs)	RAMP superfamily	-	Family
I [auth C], J [auth D], K [auth E]	PF03750	Csm2 Type III-A (Csm2_III-A)	Csm2 Type III-A	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	CRISPR-associated protein Cas10	nuclease activity hydrolase activity, acting on ester bonds hydrolase activity exonuclease activity catalytic activity binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding nuclease activity hydrolase activity, acting on ester bonds hydrolase activity exonuclease activity catalytic activity binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding endonuclease activity	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-
B	CRISPR-associated protein Csm4	RNA binding binding organic cyclic compound binding nucleic acid binding	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-
C [auth F], D [auth H], E [auth G], F [auth I]	CRISPR-associated protein Csm3	endonuclease activity nuclease activity hydrolase activity, acting on ester bonds hydrolase activity catalytic activity RNA binding binding organic cyclic compound binding nucleic acid binding	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-
G [auth J]	CRISPR-associated protein Csm5	RNA binding binding organic cyclic compound binding nucleic acid binding	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-
H [auth R]	Crispr RNA	-	-	-
I [auth C], J [auth D], K [auth E]	CRISPR-associated protein Csm2	RNA binding binding organic cyclic compound binding nucleic acid binding	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-
L [auth T]	target RNA	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000160	GGDEF domain	Domain
A	IPR013408	CRISPR system single-strand-specific deoxyribonuclease Cas10/Csm1	Family
A	IPR048693	CRISPR RNA silencing complex Cmr2-like, C-terminal domain	Domain
A	IPR052117	CRISPR-associated Cas10/Csm1 subtype III-A protein	Family
A	IPR041062	Csm1, subunit domain B	Domain
A	IPR043128	Reverse transcriptase/Diguanylate cyclase domain	Homologous Superfamily
A	IPR006674	HD domain	Domain
B	IPR005537	CRISPR type III-associated protein	Family
B	IPR005510	CRISPR type III-associated RAMP protein Csm4	Family
B	IPR040932	Csm4, C-terminal	Domain
C [auth F], D [auth H], E [auth G], F [auth I]	IPR052216	CRISPR-associated Csm3 endoribonuclease	Family
C [auth F], D [auth H], E [auth G], F [auth I]	IPR005537	CRISPR type III-associated protein	Family
C [auth F], D [auth H], E [auth G], F [auth I]	IPR013412	CRISPR-associated RAMP Csm3	Family
G [auth J]	IPR005537	CRISPR type III-associated protein	Family
G [auth J]	IPR010173	CRISPR-associated protein Csm5	Family
I [auth C], J [auth D], K [auth E]	IPR010149	CRISPR-associated protein, Csm2 Type III-A	Family

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.