radical SAM (S-adenosylmethionine) protein containing additional 4Fe4S-binding SPASM domain, similar to coenzyme PQQ synthesis protein E (PqqE) and anaerobic sulfatase-maturating enzyme (anSME)
mycofactocin radical SAM maturase; Members of this family are uncharacterized radical SAM ...
9-349
0e+00
mycofactocin radical SAM maturase; Members of this family are uncharacterized radical SAM proteins from the Mycobacterium tuberculosis and many other Actinobacteria, as well as some deltaproteobacteria (e.g. Geobacter uraniireducens), firmicutes (Pelotomaculum thermopropionicum and Desulfotomaculum acetoxidans), and Chloroflexi (Thermomicrobium roseum DSM 5159 and Sphaerobacter thermophilus DSM 20745). They resemble several characterized radical SAM enzymes of peptide modification (PqqE, AlbA), and are always found next to the proposed target, TIGR03969, the putative mycofactocin precursor. [Unknown function, Enzymes of unknown specificity]
:
Pssm-ID: 188477 [Multi-domain] Cd Length: 339 Bit Score: 701.60 E-value: 0e+00
mycofactocin radical SAM maturase; Members of this family are uncharacterized radical SAM ...
9-349
0e+00
mycofactocin radical SAM maturase; Members of this family are uncharacterized radical SAM proteins from the Mycobacterium tuberculosis and many other Actinobacteria, as well as some deltaproteobacteria (e.g. Geobacter uraniireducens), firmicutes (Pelotomaculum thermopropionicum and Desulfotomaculum acetoxidans), and Chloroflexi (Thermomicrobium roseum DSM 5159 and Sphaerobacter thermophilus DSM 20745). They resemble several characterized radical SAM enzymes of peptide modification (PqqE, AlbA), and are always found next to the proposed target, TIGR03969, the putative mycofactocin precursor. [Unknown function, Enzymes of unknown specificity]
Pssm-ID: 188477 [Multi-domain] Cd Length: 339 Bit Score: 701.60 E-value: 0e+00
Radical SAM superfamily maturase, SkfB/NifB/PqqE family [Cell cycle control, cell division, ...
22-165
4.45e-57
Radical SAM superfamily maturase, SkfB/NifB/PqqE family [Cell cycle control, cell division, chromosome partitioning, Coenzyme transport and metabolism];
Pssm-ID: 440301 [Multi-domain] Cd Length: 159 Bit Score: 183.95 E-value: 4.45e-57
Iron-sulfur cluster-binding SPASM domain of mycofactocin radical SAM maturase MftC and similar ...
249-342
8.38e-29
Iron-sulfur cluster-binding SPASM domain of mycofactocin radical SAM maturase MftC and similar proteins; This group is composed of Mycobacterium tuberculosis putative mycofactocin radical SAM maturase MftC and similar proteins. MftC is a radical S-adenosylmethionine (SAM) enzyme that may function to modify mycofactocin, a conserved polypeptide that might serve as an electron carrier. Radical SAM enzymes are characterized by a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster that is involved in the reductive cleavage of SAM and generates a 5'-deoxyadenosyl radical, which in turn abstracts a hydrogen from the appropriately positioned carbon atom of the substrate. Radical SAM enzymes with a C-terminal SPASM domain contain at least one other iron-sulfur cluster. This group appears to contain one auxillary Fe-S cluster that is similar to the second auxillary 4Fe-4S cluster (AuxII) of Clostridium perfringens anaerobic sulfatase-maturating enzyme (anSME).
Pssm-ID: 410614 [Multi-domain] Cd Length: 91 Bit Score: 107.73 E-value: 8.38e-29
Radical SAM superfamily; Radical SAM proteins catalyze diverse reactions, including unusual ...
26-177
2.75e-25
Radical SAM superfamily; Radical SAM proteins catalyze diverse reactions, including unusual methylations, isomerization, sulphur insertion, ring formation, anaerobic oxidation and protein radical formation.
Pssm-ID: 427681 [Multi-domain] Cd Length: 159 Bit Score: 100.29 E-value: 2.75e-25
twitch domain-containing radical SAM protein; Members of this family are unusual among radical ...
13-177
3.71e-11
twitch domain-containing radical SAM protein; Members of this family are unusual among radical SAM proteins in several ways. First, the N-terminal region consists of an iron-sulfur cluster-binding twitch domain (half of a SPASM domain), something usually found C-terminal to the radical SAM domain. Second, the radical SAM domains in many of the members of this family score poorly vs. the Pfam HMM, PF04055 (version 19), used to identify radical SAM. Lastly, the majority of members sequenced to date come from uncultured bacteria from marine or aquifer sources rather than from conventionally cultured bacterial isolates. The function is unknown.
Pssm-ID: 468123 [Multi-domain] Cd Length: 396 Bit Score: 64.21 E-value: 3.71e-11
mycofactocin radical SAM maturase; Members of this family are uncharacterized radical SAM ...
9-349
0e+00
mycofactocin radical SAM maturase; Members of this family are uncharacterized radical SAM proteins from the Mycobacterium tuberculosis and many other Actinobacteria, as well as some deltaproteobacteria (e.g. Geobacter uraniireducens), firmicutes (Pelotomaculum thermopropionicum and Desulfotomaculum acetoxidans), and Chloroflexi (Thermomicrobium roseum DSM 5159 and Sphaerobacter thermophilus DSM 20745). They resemble several characterized radical SAM enzymes of peptide modification (PqqE, AlbA), and are always found next to the proposed target, TIGR03969, the putative mycofactocin precursor. [Unknown function, Enzymes of unknown specificity]
Pssm-ID: 188477 [Multi-domain] Cd Length: 339 Bit Score: 701.60 E-value: 0e+00
Radical SAM superfamily maturase, SkfB/NifB/PqqE family [Cell cycle control, cell division, ...
22-165
4.45e-57
Radical SAM superfamily maturase, SkfB/NifB/PqqE family [Cell cycle control, cell division, chromosome partitioning, Coenzyme transport and metabolism];
Pssm-ID: 440301 [Multi-domain] Cd Length: 159 Bit Score: 183.95 E-value: 4.45e-57
SynChlorMet cassette radical SAM/SPASM protein ScmF; A biosynthesis cassette found in ...
26-343
2.00e-31
SynChlorMet cassette radical SAM/SPASM protein ScmF; A biosynthesis cassette found in Syntrophobacter fumaroxidans MPOB, Chlorobium limicola DSM 245, Methanocella paludicola SANAE, and delta proteobacterium NaphS2 contains two PqqE-like radical SAM/SPASM domain proteins, a PqqD homolog, and a conserved hypothetical protein. These components suggest modification of a ribosomally produced peptide precursor, but the precursor has not been identified. Of the two PqqE homologs of the cassette, this family is the more distant in sequence.
Pssm-ID: 211974 [Multi-domain] Cd Length: 353 Bit Score: 122.25 E-value: 2.00e-31
Iron-sulfur cluster-binding SPASM domain of mycofactocin radical SAM maturase MftC and similar ...
249-342
8.38e-29
Iron-sulfur cluster-binding SPASM domain of mycofactocin radical SAM maturase MftC and similar proteins; This group is composed of Mycobacterium tuberculosis putative mycofactocin radical SAM maturase MftC and similar proteins. MftC is a radical S-adenosylmethionine (SAM) enzyme that may function to modify mycofactocin, a conserved polypeptide that might serve as an electron carrier. Radical SAM enzymes are characterized by a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster that is involved in the reductive cleavage of SAM and generates a 5'-deoxyadenosyl radical, which in turn abstracts a hydrogen from the appropriately positioned carbon atom of the substrate. Radical SAM enzymes with a C-terminal SPASM domain contain at least one other iron-sulfur cluster. This group appears to contain one auxillary Fe-S cluster that is similar to the second auxillary 4Fe-4S cluster (AuxII) of Clostridium perfringens anaerobic sulfatase-maturating enzyme (anSME).
Pssm-ID: 410614 [Multi-domain] Cd Length: 91 Bit Score: 107.73 E-value: 8.38e-29
Radical SAM superfamily; Radical SAM proteins catalyze diverse reactions, including unusual ...
26-177
2.75e-25
Radical SAM superfamily; Radical SAM proteins catalyze diverse reactions, including unusual methylations, isomerization, sulphur insertion, ring formation, anaerobic oxidation and protein radical formation.
Pssm-ID: 427681 [Multi-domain] Cd Length: 159 Bit Score: 100.29 E-value: 2.75e-25
SynChlorMet cassette radical SAM/SPASM protein ScmE; A biosynthesis cassette found in ...
25-180
1.31e-22
SynChlorMet cassette radical SAM/SPASM protein ScmE; A biosynthesis cassette found in Syntrophobacter fumaroxidans MPOB, Chlorobium limicola DSM 245, Methanocella paludicola SANAE, and delta proteobacterium NaphS2 contains two PqqE-like radical SAM/SPASM domain proteins, a PqqD homolog, and a conserved hypothetical protein. These components suggest modification of a ribosomally produced peptide precursor, but the precursor has not been identified. Of the two PqqE homologs of the cassette, this family is the closer in sequence.
Pssm-ID: 211973 [Multi-domain] Cd Length: 358 Bit Score: 97.62 E-value: 1.31e-22
Radical SAM superfamily. Enzymes of this family generate radicals by combining a 4Fe-4S ...
24-218
2.87e-18
Radical SAM superfamily. Enzymes of this family generate radicals by combining a 4Fe-4S cluster and S-adenosylmethionine (SAM) in close proximity. They are characterized by a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster. Mechanistically, they share the transfer of a single electron from the iron-sulfur cluster to SAM, which leads to its reductive cleavage to methionine and a 5'-deoxyadenosyl radical, which, in turn, abstracts a hydrogen from the appropriately positioned carbon atom. Depending on the enzyme, SAM is consumed during this process or it is restored and reused. Radical SAM enzymes catalyze steps in metabolism, DNA repair, the biosynthesis of vitamins and coenzymes, and the biosynthesis of many antibiotics. Examples are biotin synthase (BioB), lipoyl synthase (LipA), pyruvate formate-lyase (PFL), coproporphyrinogen oxidase (HemN), lysine 2,3-aminomutase (LAM), anaerobic ribonucleotide reductase (ARR), and MoaA, an enzyme of the biosynthesis of molybdopterin.
Pssm-ID: 100105 [Multi-domain] Cd Length: 204 Bit Score: 82.38 E-value: 2.87e-18
radical SAM additional 4Fe4S-binding SPASM domain; This domain contains regions binding ...
251-341
2.86e-17
radical SAM additional 4Fe4S-binding SPASM domain; This domain contains regions binding additional 4Fe4S clusters found in various radical SAM proteins C-terminal to the domain described by model pfam04055. Radical SAM enzymes with this domain tend to be involved in protein modification, including anaerobic sulfatase maturation proteins, a quinohemoprotein amine dehydrogenase biogenesis protein, the Pep1357-cyclizing radical SAM enzyme, and various bacteriocin biosynthesis proteins. The motif CxxCxxxxxCxxxC is nearly invariant for members of this family, although PqqE has a variant form. We name this domain SPASM for Subtilosin, PQQ, Anaerobic Sulfatase, and Mycofactocin.
Pssm-ID: 274968 [Multi-domain] Cd Length: 93 Bit Score: 76.46 E-value: 2.86e-17
GTP 3',8-cyclase (molybdenum cofactor biosynthesis protein MoaA) [Coenzyme transport and ...
26-189
1.44e-13
GTP 3',8-cyclase (molybdenum cofactor biosynthesis protein MoaA) [Coenzyme transport and metabolism]; GTP 3',8-cyclase (molybdenum cofactor biosynthesis protein MoaA) is part of the Pathway/BioSystem: Molybdopterin biosynthesis
Pssm-ID: 442141 [Multi-domain] Cd Length: 329 Bit Score: 70.86 E-value: 1.44e-13
putative peptide-modifying radical SAM enzyme, Mhun_1560 family; Members of this family are ...
27-342
5.89e-13
putative peptide-modifying radical SAM enzyme, Mhun_1560 family; Members of this family are radical SAM enzymes, homologous to a variety of other peptide-modifying radical SAM, and found primarily in methanogenic archaea.
Pssm-ID: 274966 [Multi-domain] Cd Length: 376 Bit Score: 69.37 E-value: 5.89e-13
Iron-sulfur cluster-binding SPASM domain of antilisterial bacteriocin subtilosin biosynthesis ...
251-341
1.25e-12
Iron-sulfur cluster-binding SPASM domain of antilisterial bacteriocin subtilosin biosynthesis protein AlbA and similar proteins; Bacillus subtilis antilisterial bacteriocin subtilosin biosynthesis protein AlbA is a radical S-adenosylmethionine (SAM) enzyme that catalyzes the formation of three thioether bonds in the post-translational modification of a linear peptide into the cyclic peptide subtilosin A. The thioether bonds formed are between the sulfur of three cysteine residues and the alpha-carbons of two phenylalanines and one threonine to produce a rigid cyclic peptide. Radical SAM enzymes are characterized by a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster that is involved in the reductive cleavage of SAM and generates a 5'-deoxyadenosyl radical, which in turn abstracts a hydrogen from the appropriately positioned carbon atom of the substrate. Radical SAM enzymes with a C-terminal SPASM domain contain at least one other iron-sulfur cluster. AlbA appears to contain one auxillary Fe-S cluster, similar to the auxillary 4Fe-4S cluster in Bacillus circulans butirosin biosynthetic enzyme BtrN.
Pssm-ID: 410616 [Multi-domain] Cd Length: 97 Bit Score: 63.28 E-value: 1.25e-12
twitch domain-containing radical SAM protein; Members of this family are unusual among radical ...
13-177
3.71e-11
twitch domain-containing radical SAM protein; Members of this family are unusual among radical SAM proteins in several ways. First, the N-terminal region consists of an iron-sulfur cluster-binding twitch domain (half of a SPASM domain), something usually found C-terminal to the radical SAM domain. Second, the radical SAM domains in many of the members of this family score poorly vs. the Pfam HMM, PF04055 (version 19), used to identify radical SAM. Lastly, the majority of members sequenced to date come from uncultured bacteria from marine or aquifer sources rather than from conventionally cultured bacterial isolates. The function is unknown.
Pssm-ID: 468123 [Multi-domain] Cd Length: 396 Bit Score: 64.21 E-value: 3.71e-11
Iron-sulfur cluster-binding SPASM domain; This iron-sulfur cluster-binding domain is named ...
251-313
3.83e-09
Iron-sulfur cluster-binding SPASM domain; This iron-sulfur cluster-binding domain is named SPASM after the biochemically characterized members, AlbA, PqqE, anSME, and MftC, which are involved in Subtilosin A, Pyrroloquinoline quinone, Anaerobic Sulfatase, and Mycofactocin maturation, respectively. SPASM occurs as an additional C-terminal domain in many peptide-modifying enzymes of the radical S-adenosylmethionine (SAM) superfamily. Radical SAM enzymes are characterized by a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster that is involved in the reductive cleavage of SAM and generates a 5'-deoxyadenosyl radical, which in turn abstracts a hydrogen from the appropriately positioned carbon atom of the substrate. Radical SAM enzymes with a C-terminal SPASM domain contain at least one other iron-sulfur cluster.
Pssm-ID: 410609 [Multi-domain] Cd Length: 65 Bit Score: 52.42 E-value: 3.83e-09
Iron-sulfur cluster-binding SPASM domain of sactionine bond-forming enzyme CteB and similar ...
248-341
3.65e-07
Iron-sulfur cluster-binding SPASM domain of sactionine bond-forming enzyme CteB and similar proteins; Clostridium thermocellum sactionine bond-forming enzyme CteB is a radical S-adenosylmethionine (SAM) enzyme that catalyzes the formation of the requisite thioether bridge between a cysteine and the alpha-carbon of an opposing amino acid that is required in sactipeptide biosynthesis. Radical SAM enzymes are characterized by a conserved CxxxCxxC motif, which coordinates the conserved iron-sulfur cluster that is involved in the reductive cleavage of SAM and generates a 5'-deoxyadenosyl radical, which in turn abstracts a hydrogen from the appropriately positioned carbon atom of the substrate. Radical SAM (RS) enzymes with a C-terminal SPASM domain contain at least one other iron-sulfur cluster. CteB contains two auxillary 4Fe-4S clusters in its SPASM domain; the auxillary cluster nearest the RS site, called AuxI, exhibits an open coordination site in the absence of peptide substrate, which is coordinated by a peptidyl-cysteine residue in the bound state.
Pssm-ID: 410615 [Multi-domain] Cd Length: 96 Bit Score: 47.73 E-value: 3.65e-07
Wyosine [tRNA(Phe)-imidazoG37] synthetase, radical SAM superfamily [Translation, ribosomal ...
29-132
8.45e-07
Wyosine [tRNA(Phe)-imidazoG37] synthetase, radical SAM superfamily [Translation, ribosomal structure and biogenesis]; Wyosine [tRNA(Phe)-imidazoG37] synthetase, radical SAM superfamily is part of the Pathway/BioSystem: tRNA modification
Pssm-ID: 440495 [Multi-domain] Cd Length: 248 Bit Score: 49.80 E-value: 8.45e-07
Iron-sulfur cluster-binding domain; This domain occurs as an additional C-terminal iron-sulfur ...
251-315
1.43e-04
Iron-sulfur cluster-binding domain; This domain occurs as an additional C-terminal iron-sulfur cluster binding domain in many radical SAM domain, pfam04055 proteins. The domain occurs in a number of proteins that modify a protein to become an active enzyme, or a peptide to become a ribosomal natural product. The domain is named SPASM because it occurs in the maturases of Subilitosin, PQQ, Anaerobic Sulfatases, and Mycofactocin.
Pssm-ID: 433020 [Multi-domain] Cd Length: 66 Bit Score: 39.77 E-value: 1.43e-04
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.
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