type I restriction endonuclease subunit R (HsdR) is required for both nuclease and ATPase activities, but not for modification; belongs to the DEAD/DEAH box helicase superfamily
type I site-specific deoxyribonuclease, HsdR family; This gene is part of the type I ...
8-767
5.64e-38
type I site-specific deoxyribonuclease, HsdR family; This gene is part of the type I restriction and modification system which is composed of three polypeptides R (restriction endonuclease), M (modification) and S (specificity). This group of enzymes recognize specific short DNA sequences and have an absolute requirement for ATP (or dATP) and S-adenosyl-L-methionine. They also catalyse the reactions of EC 2.1.1.72 and EC 2.1.1.73, with similar site specificity.(J. Mol. Biol. 271 (3), 342-348 (1997)). Members of this family are assumed to differ from each other in DNA site specificity. [DNA metabolism, Restriction/modification]
Pssm-ID: 273028 [Multi-domain] Cd Length: 667 Bit Score: 152.17 E-value: 5.64e-38
DEXH-box helicase domain of type I restriction enzyme HdsR subunit; The HdsR motor subunit of ...
266-507
2.85e-22
DEXH-box helicase domain of type I restriction enzyme HdsR subunit; The HdsR motor subunit of type I restriction-modification enzymes contains the DNA cleavage and ATP-dependent DNA translocation activities of the heteromeric complex. It is a member of the DEAD-like helicase superfamily, a diverse family of proteins involved in ATP-dependent RNA or DNA unwinding. This domain contains the ATP-binding region.
Pssm-ID: 350788 [Multi-domain] Cd Length: 208 Bit Score: 96.14 E-value: 2.85e-22
type I site-specific deoxyribonuclease, HsdR family; This gene is part of the type I ...
8-767
5.64e-38
type I site-specific deoxyribonuclease, HsdR family; This gene is part of the type I restriction and modification system which is composed of three polypeptides R (restriction endonuclease), M (modification) and S (specificity). This group of enzymes recognize specific short DNA sequences and have an absolute requirement for ATP (or dATP) and S-adenosyl-L-methionine. They also catalyse the reactions of EC 2.1.1.72 and EC 2.1.1.73, with similar site specificity.(J. Mol. Biol. 271 (3), 342-348 (1997)). Members of this family are assumed to differ from each other in DNA site specificity. [DNA metabolism, Restriction/modification]
Pssm-ID: 273028 [Multi-domain] Cd Length: 667 Bit Score: 152.17 E-value: 5.64e-38
DEXH-box helicase domain of type I restriction enzyme HdsR subunit; The HdsR motor subunit of ...
266-507
2.85e-22
DEXH-box helicase domain of type I restriction enzyme HdsR subunit; The HdsR motor subunit of type I restriction-modification enzymes contains the DNA cleavage and ATP-dependent DNA translocation activities of the heteromeric complex. It is a member of the DEAD-like helicase superfamily, a diverse family of proteins involved in ATP-dependent RNA or DNA unwinding. This domain contains the ATP-binding region.
Pssm-ID: 350788 [Multi-domain] Cd Length: 208 Bit Score: 96.14 E-value: 2.85e-22
N-terminal domain of HsdR motor subunit of type I restriction-modification enzyme EcoR124I and ...
8-174
6.85e-12
N-terminal domain of HsdR motor subunit of type I restriction-modification enzyme EcoR124I and similar systems; The N-terminal endonuclease-like domain of HsdR motor subunit of type I restriction-modification enzyme EcoR124I belongs to a wider superfamily of PDDEXK nucleases including very short patch repair (Vsr) endonucleases, archaeal Holliday junction resolvases, MutH methyl-directed DNA mismatch-repair endonucleases, and catalytic domains of many restriction endonucleases, such as EcoRI, BamHI, and FokI.
Pssm-ID: 411736 [Multi-domain] Cd Length: 226 Bit Score: 66.14 E-value: 6.85e-12
C-terminal helicase domain of EcoR124I HsdR-like restriction enzyme family helicases; This ...
702-754
4.75e-10
C-terminal helicase domain of EcoR124I HsdR-like restriction enzyme family helicases; This family is composed of helicase restriction enzymes, including the HsdR subunit of restriction-modification enzymes such as Escherichia coli type I restriction enzyme EcoR124I R protein. EcoR124I recognizes the sequence, 5'-GAAN(6)RTCG-3', and cleaves at random sites. The HsdR or R subunit is required for both nuclease and ATPase activities, but not for modification. These proteins are DEAD-like helicases belonging to superfamily (SF)2, a diverse family of proteins involved in ATP-dependent RNA or DNA unwinding. Similar to SF1 helicases, SF2 helicases do not form toroidal structures like SF3-6 helicases. Their helicase core consists of two similar protein domains that resemble the fold of the recombination protein RecA. This model describes the C-terminal domain, also called HelicC.
Pssm-ID: 350187 [Multi-domain] Cd Length: 82 Bit Score: 56.80 E-value: 4.75e-10
Type I restriction enzyme R protein N terminus (HSDR_N); This family consists of a number of N ...
116-216
1.56e-07
Type I restriction enzyme R protein N terminus (HSDR_N); This family consists of a number of N terminal regions found in type I restriction enzyme R (HSDR) proteins. Restriction and modification (R/M) systems are found in a wide variety of prokaryotes and are thought to protect the host bacterium from the uptake of foreign DNA. Type I restriction and modification systems are encoded by three genes: hsdR, hsdM, and hsdS. The three polypeptides, HsdR, HsdM, and HsdS, often assemble to give an enzyme (R2M2S1) that modifies hemimethylated DNA and restricts unmethylated DNA.
Pssm-ID: 427858 [Multi-domain] Cd Length: 151 Bit Score: 51.92 E-value: 1.56e-07
C-terminal helicase domain of EcoAI HsdR-like restriction enzyme family helicases; This family ...
690-754
2.45e-04
C-terminal helicase domain of EcoAI HsdR-like restriction enzyme family helicases; This family is composed of helicase restriction enzymes, including the HsdR subunit of restriction-modification enzymes such as Escherichia coli type I restriction enzyme EcoAI R protein (R.EcoAI). The EcoAI enzyme recognizes 5'-GAGN(7)GTCA-3'. The HsdR or R subunit is required for both nuclease and ATPase activities, but not for modification. These proteins are DEAD-like helicases belonging to superfamily (SF)2, a diverse family of proteins involved in ATP-dependent RNA or DNA unwinding. Similar to SF1 helicases, SF2 helicases do not form toroidal structures like SF3-6 helicases. Their helicase core consists of two similar protein domains that resemble the fold of the recombination protein RecA. This model describes the C-terminal domain, also called HelicC.
Pssm-ID: 350186 [Multi-domain] Cd Length: 116 Bit Score: 41.78 E-value: 2.45e-04
DEXH-box helicase domain of type III restriction enzyme res subunit; Members of this model ...
296-449
2.72e-03
DEXH-box helicase domain of type III restriction enzyme res subunit; Members of this model includes both type I and type III restriction enzymes. Both are hetero-oligomeric proteins. Type I REs are encoded by three closely linked genes: a specificity subunit (HsdS or S) for recognizing a DNA sequence, a methylation subunit (HsdM or M) for methylating the recognized target bases, and a restriction subunit (HsdR or R) for the translocation and random cleavage of non-methylated DNA. They show diverse catalytic activities, including methyltransferase (MTase), ATP hydrolase (ATPase), DNA translocation and restriction activities. These enzymes cut at a site that differs, and is a random distance (at least 1000 bp) away, from their recognition site. Cleavage at these random sites follows a process of DNA translocation, which shows that these enzymes are also molecular motors. The recognition site is asymmetrical and is composed of two specific portions: one containing 3-4 nucleotides, and another containing 4-5 nucleotides, separated by a non-specific spacer of about 6-8 nucleotides. Type III enzymes are composed of two subunits, Res and Mod. The Mod subunit recognizes the DNA sequence specific for the system and is a modification methyltransferase; as such, it is functionally equivalent to the M and S subunits of type I restriction endonucleases. Res is required for restriction, although it has no enzymatic activity on its own. Type III enzymes recognize short 5-6 bp-long asymmetric DNA sequences and cleave 25-27 bp downstream to leave short, single-stranded 5' protrusions. They require the presence of two inversely oriented unmethylated recognition sites for restriction to occur. These enzymes methylate only one strand of the DNA, at the N-6 position of adenosyl residues, so newly replicated DNA will have only one strand methylated, which is sufficient to protect against restriction. Both type I and type III REs are members of the DEAD-like helicase superfamily, a diverse family of proteins involved in ATP-dependent RNA or DNA unwinding. This domain contains the ATP-binding region.
Pssm-ID: 350790 [Multi-domain] Cd Length: 163 Bit Score: 39.85 E-value: 2.72e-03
N-terminal DEAD/H-box helicase domain of superfamily 2 helicases; The DEAD/H-like superfamily ...
327-446
4.84e-03
N-terminal DEAD/H-box helicase domain of superfamily 2 helicases; The DEAD/H-like superfamily 2 helicases comprise a diverse family of proteins involved in ATP-dependent RNA or DNA unwinding. This N-terminal domain contains the ATP-binding region.
Pssm-ID: 350668 [Multi-domain] Cd Length: 146 Bit Score: 38.54 E-value: 4.84e-03
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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Functional characterization of the conserved domain architecture found on the query.
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(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
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