identifier: traitmech:000563 label: Lamassu-Mrr system definition: A Lamassu system in which an organism possesses a genome-encoded DefenseFinder Lamassu-Mrr subtype locus represented by the Lamassu-Mrr rule row requiring the Lamassu-Fam__LmuA_effector_Mrr and Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II profiles. definition_source: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv trait_category: GENOMICS term_kind: CLASS mapping_status: PROPOSED parent_traits: - traitmech:000232 synonyms: - synonym_text: Lamassu-Mrr synonym_type: RELATED_SYNONYM source: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv - synonym_text: Lamassu-Fam__LmuA_effector_Mrr synonym_type: RELATED_SYNONYM source: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md evidence: - reference: DOI:10.1073/pnas.2519643122 snippet: a bacterial immune system family featuring diverse effectors but a core conserved SMC-like sensor notes: Haudiquet et al. support placing Lamassu subtypes under a Lamassu family with diverse LmuA effectors and a conserved SMC-like sensor. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md snippet: '| Lamassu-Fam | 10\.1101/2022\.05\.11\.491447 | An expanding arsenal of immune systems that protect bacteria from phages | ' notes: The pinned DefenseFinder article registry maps the Lamassu-Fam model namespace to a bacterial immune-systems preprint. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuA_effector_Mrr | Lamassu-Fam__LmuA_effector_Mrr | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records the Lamassu-Fam__LmuA_effector_Mrr custom profile listed as mandatory by the Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II | Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records the Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II custom profile, which the Lamassu-Mrr rule row lists as mandatory despite the HMM inventory also carrying an Mrr-scoped LmuB SMC profile. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuB_SMC_Mrr | Lamassu-Fam__LmuB_SMC_Mrr | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records a Lamassu-Fam__LmuB_SMC_Mrr custom profile that is not the LmuB SMC profile named by the pinned Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuC_acc_Lipase | Lamassu-Fam__LmuC_acc_Lipase | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records the Lamassu-Fam__LmuC_acc_Lipase custom profile listed as accessory by the Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuC_acc_Mrr | Lamassu-Fam__LmuC_acc_Mrr | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records a Lamassu-Fam__LmuC_acc_Mrr custom profile that is not the LmuC accessory profile named by the pinned Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "Lamassu-Fam\tLamassu-Mrr\t2\t2\tLamassu-Fam__LmuA_effector_Mrr, Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II\t\ Lamassu-Fam__LmuC_acc_Lipase\tLamassu-Fam__LmuA_effector_Amidase, Lamassu-Fam__LmuA_effector_Cap4_nuclease,\ \ Lamassu-Fam__LmuA_effector_Cap4_nuclease_II, Lamassu-Fam__LmuA_effector_FMO,\ \ Lamassu-Fam__LmuA_effector_Hydrolase, Lamassu-Fam__LmuA_effector_Lipase, Lamassu-Fam__LmuA_effector_PDDEXK,\ \ Lamassu-Fam__LmuA_effector_Protease, Lamassu-Fam__LmuA_effector_Sir2, Lamassu-Fam__LmuA_effector_hypothetical\t" notes: The pinned DefenseFinder rules table models Lamassu-Mrr as a Lamassu-Fam subsystem requiring Lamassu-Fam__LmuA_effector_Mrr and Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II, with Lamassu-Fam__LmuC_acc_Lipase as an accessory profile. causal_graphs: - graph_id: lamassu_mrr_locus_subtype_defense title: Lamassu-Mrr is a DefenseFinder Lamassu subtype description: Conservative subtype-level classification linking the DefenseFinder Lamassu-Mrr rule-row definition to Lamassu-Mrr system possession and its Lamassu parent. scope_status: NONMECHANISTIC scope_notes: The graph captures Lamassu-Mrr as a DefenseFinder rule-row subtype of Lamassu system possession without asserting a Lamassu-Mrr-specific antiphage process, selecting between the rule-row LmuB/LmuC profile names and the Mrr-scoped LmuB/LmuC HMM rows, or resolving exact phage-triggered Mrr effector activity, viral-DNA trigger, LmuC requirement, native host breadth, cell-death output, or whether every DefenseFinder Lamassu-Mrr prediction is a complete experimentally active locus. nodes: - node_id: lamassu_mrr_system_trait label: Lamassu-Mrr system node_type: TRAIT grounding: traitmech:000563 description: Possession of a genome-encoded Lamassu-Mrr phage-defense system. - node_id: lamassu_system_trait label: Lamassu system node_type: TRAIT grounding: traitmech:000232 description: Possession of a genome-encoded Lamassu phage-defense system. edges: - subject: lamassu_mrr_system_trait predicate: is a predicate_id: rdfs:subClassOf object: lamassu_system_trait description: Lamassu-Mrr system possession is a Lamassu-system trait. evidence: - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md snippet: '| Lamassu-Fam | 10\.1101/2022\.05\.11\.491447 | An expanding arsenal of immune systems that protect bacteria from phages | ' notes: The pinned DefenseFinder article registry maps the Lamassu-Fam model namespace to a bacterial immune-systems preprint. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "Lamassu-Fam\tLamassu-Mrr\t2\t2" notes: The pinned DefenseFinder rules table places the Lamassu-Mrr subsystem under the Lamassu-Fam system key with 2 mandatory matches and 2 genes required. discussions: - discussion_id: lamassu-mrr-activity-gap prompt: Resolve Lamassu-Mrr phage triggers, native hosts, Mrr effector activity, LmuB/LmuC model rows, LmuC usage, and profile-to-activity criteria before minting enzyme, trigger, or component children. kind: KNOWLEDGE_GAP status: OPEN rationale: Haudiquet et al. support a Lamassu family with diverse LmuA effectors and a conserved SMC-like sensor, and the pinned DefenseFinder HMM inventory and rules table support Lamassu-Mrr as a Lamassu-Fam subtype whose rule row requires Lamassu-Fam__LmuA_effector_Mrr and Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II. This first-pass record follows the rule row but leaves the relationship between its LmuB Cap4-nuclease and LmuC Lipase profile names and the Mrr-scoped Lamassu-Fam__LmuB_SMC_Mrr and Lamassu-Fam__LmuC_acc_Mrr HMM rows unresolved, along with exact Mrr effector activity, LmuC requirement, native hosts, phage triggers, cell-death output, and profile-to-activity criteria. evidence: - reference: DOI:10.1073/pnas.2519643122 snippet: a bacterial immune system family featuring diverse effectors but a core conserved SMC-like sensor notes: Haudiquet et al. support placing Lamassu subtypes under a Lamassu family with diverse LmuA effectors and a conserved SMC-like sensor. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuA_effector_Mrr | Lamassu-Fam__LmuA_effector_Mrr | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records the Lamassu-Fam__LmuA_effector_Mrr custom profile listed as mandatory by the Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuB_SMC_Mrr | Lamassu-Fam__LmuB_SMC_Mrr | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records a Lamassu-Fam__LmuB_SMC_Mrr custom profile that is not the LmuB SMC profile named by the pinned Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| Lamassu-Fam__LmuC_acc_Mrr | Lamassu-Fam__LmuC_acc_Mrr | Lamassu-Fam | Custom | 20 |' notes: The pinned DefenseFinder HMM inventory records a Lamassu-Fam__LmuC_acc_Mrr custom profile that is not the LmuC accessory profile named by the pinned Lamassu-Mrr rule row. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "Lamassu-Fam\tLamassu-Mrr\t2\t2\tLamassu-Fam__LmuA_effector_Mrr, Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II\t\ Lamassu-Fam__LmuC_acc_Lipase\tLamassu-Fam__LmuA_effector_Amidase, Lamassu-Fam__LmuA_effector_Cap4_nuclease,\ \ Lamassu-Fam__LmuA_effector_Cap4_nuclease_II, Lamassu-Fam__LmuA_effector_FMO,\ \ Lamassu-Fam__LmuA_effector_Hydrolase, Lamassu-Fam__LmuA_effector_Lipase, Lamassu-Fam__LmuA_effector_PDDEXK,\ \ Lamassu-Fam__LmuA_effector_Protease, Lamassu-Fam__LmuA_effector_Sir2, Lamassu-Fam__LmuA_effector_hypothetical\t" notes: The pinned DefenseFinder rules table models Lamassu-Mrr as a Lamassu-Fam subsystem requiring Lamassu-Fam__LmuA_effector_Mrr and Lamassu-Fam__LmuB_SMC_Cap4_nuclease_II, with Lamassu-Fam__LmuC_acc_Lipase as an accessory profile. attaches_to: - causal_graphs#lamassu_mrr_locus_subtype_defense posed_by: codex posed_date: '2026-10-03' curation_history: - timestamp: '2026-10-03T04:26:00Z' curator: codex action: MINTED_TRAITMECH_ID changes: Minted Lamassu-Mrr system as a DefenseFinder-backed GENOMICS TraitRecord under the Lamassu system parent after an ignored-and-hidden duplicate review found no exact live TraitMech, METPO, history, or prior proposal record for the target local ID, placeholder METPO ID, proposal cohort, record slug, human label, or DefenseFinder subsystem; existing Lamassu-Fam__LmuA_effector_Mrr mentions were limited to forbidden-profile evidence on neighboring Lamassu-Fam subtypes, and the replacement placeholder is reserved in proposals/metpo_traitmech_v440. llm_assisted: true - timestamp: '2026-10-03T04:26:02Z' curator: codex action: REVIEW_CANONICAL_EXAMPLE_EVIDENCE_GAP changes: Reviewed Lamassu-Mrr system during initial curation and left canonical_examples empty because the pinned DefenseFinder tables support a rule-row subtype but not an accession-backed native microbial taxon exemplar tied to the Lamassu-Mrr profiles and experimentally verified endogenous activity. No paid research was used. llm_assisted: true