identifier: traitmech:000206 label: cold shock response definition: A stress response in which a rapid temperature downshift induces nucleic-acid-binding cold-shock proteins and RNA-remodeling functions that preserve gene expression at low temperature. definition_source: DOI:10.3184/003685003783238707 trait_category: PHYSIOLOGY term_kind: CLASS mapping_status: PROPOSED parent_traits: - traitmech:000078 synonyms: - synonym_text: cold-shock response synonym_type: EXACT_SYNONYM source: DOI:10.3184/003685003783238707 evidence: - reference: DOI:10.3184/003685003783238707 snippet: bacteria express a well-defined set of proteins after a rapid decrease in temperature, which is termed cold shock notes: Weber and Marahiel define bacterial cold shock as the temperature-downshift response that induces a specific protein set. - reference: DOI:10.3184/003685003783238707 snippet: the cold shock response is organized as a complex stimulon in which post-transcriptional events play an important role notes: The bacterial cold-shock response is reviewed as a stimulon dominated by post-transcriptional control rather than a single cold-specific sigma-factor branch. - reference: DOI:10.3184/003685003783238707 snippet: nucleic acid-binding cold shock proteins which play a fundamental role not only during cold shock adaptation but also under optimal growth conditions notes: The review places nucleic-acid-binding cold-shock proteins among the core functional components of bacterial cold-shock adaptation. - reference: DOI:10.1046/j.1365-2958.1999.01541.x snippet: proposed function as an RNA chaperone to prevent the formation of secondary structures in RNA molecules, thus facilitating translation at low temperature notes: Phadtare and Inouye support RNA chaperoning by CspA-family proteins as a mechanism for preserving translation after cold shock. canonical_examples: - taxon_id: NCBITaxon:562 taxon_label: Escherichia coli note: E. coli is a model for the bacterial cold-shock response, including induction of the major cold-shock protein CspA. reference: DOI:10.1073/pnas.87.1.283 causal_graphs: - graph_id: cold_shock_response_rna_adaptation title: Cold-shock RNA adaptation description: Evidence-backed causal sketch linking abrupt temperature downshift to bacterial cold-shock protein induction and RNA chaperone support for low-temperature translation. scope_status: MECHANISTIC scope_notes: This graph captures the conserved CspA-family RNA-support branch of the bacterial cold-shock response without making one cold-sensing regulator, one RNA helicase, or one post-transcriptional circuit universal across bacteria. nodes: - node_id: cold_shock_response_trait label: cold shock response node_type: TRAIT grounding: traitmech:000206 description: Capacity to induce cold-shock proteins after a rapid temperature downshift. - node_id: acute_cold_shock label: acute cold shock node_type: ENVIRONMENTAL_FACTOR description: A sudden downward temperature shift. - node_id: cold_shock_response_process label: cold-shock response node_type: BIOLOGICAL_PROCESS description: Rapid expression of cold-shock proteins and RNA-remodeling functions after a temperature downshift. - node_id: cspa_family_cold_shock_proteins grounding_status: REVIEWED_LABEL_ONLY grounding_notes: Reviewed functional protein family; cold-shock domain signatures and CspA-like orthology terms are broader than bacterial proteins induced and used as RNA chaperones during cold shock. label: CspA-family cold-shock proteins node_type: GENE_OR_PROTEIN description: Nucleic-acid-binding cold-shock proteins that act as RNA chaperones after cold shock. protein_examples: - uniprot_id: UniProtKB:P0A9X9 protein_label: Cold shock protein CspA gene_symbol: cspA taxon_id: NCBITaxon:83333 taxon_label: Escherichia coli K-12 entry_status: REVIEWED retrieved_on: '2026-09-15' entry_version: 146 sequence_version: 2 role: E. coli K-12 CspA is the major CspA-family cold-shock protein and model RNA chaperone induced by temperature downshift. evidence: - reference: DOI:10.1073/pnas.87.1.283 snippet: the production of a 7.4-kDa cytoplasmic protein (CS7.4) was prominently induced notes: Goldstein et al. directly support strong induction of the E. coli major cold-shock protein later named CspA. - reference: DOI:10.1046/j.1365-2958.1999.01541.x snippet: CspA, the major cold shock protein, binds RNA with low sequence specificity notes: Phadtare and Inouye directly support CspA as an RNA-binding cold-shock protein. - node_id: rna_secondary_structure_control label: RNA secondary-structure control at low temperature node_type: BIOLOGICAL_PROCESS description: RNA chaperoning that limits inhibitory secondary structure formation in cold-stressed cells. - node_id: low_temperature_translation label: translation at low temperature node_type: BIOLOGICAL_PROCESS description: Protein synthesis preserved during low-temperature stress. grounding: GO:0006412 edges: - subject: acute_cold_shock predicate: causes predicate_id: biolink:causes object: cold_shock_response_process description: Abrupt temperature downshift causes the bacterial cold-shock protein-expression response. evidence: - reference: DOI:10.3184/003685003783238707 snippet: bacteria express a well-defined set of proteins after a rapid decrease in temperature, which is termed cold shock notes: Verified against the public Crossref abstract; the cold-shock response follows rapid temperature decrease. - subject: cold_shock_response_process predicate: positively regulates predicate_id: RO:0002213 object: cspa_family_cold_shock_proteins description: The cold-shock response induces CspA-family nucleic-acid-binding cold-shock proteins. evidence: - reference: DOI:10.3184/003685003783238707 snippet: nucleic acid-binding cold shock proteins which play a fundamental role not only during cold shock adaptation notes: Verified against the public Crossref abstract; nucleic-acid-binding cold-shock proteins are central cold-shock-adaptation components. - subject: cspa_family_cold_shock_proteins predicate: contributes to predicate_id: RO:0002326 object: rna_secondary_structure_control description: CspA-family cold-shock proteins contribute to low-temperature RNA secondary-structure control. evidence: - reference: DOI:10.1046/j.1365-2958.1999.01541.x snippet: RNA chaperone to prevent the formation of secondary structures in RNA molecules notes: Verified against the public Crossref abstract; CspA-family RNA chaperone activity limits RNA secondary-structure formation. - subject: rna_secondary_structure_control predicate: contributes to predicate_id: RO:0002326 object: low_temperature_translation description: Control of RNA secondary structures supports translation at low temperature. evidence: - reference: DOI:10.1046/j.1365-2958.1999.01541.x snippet: prevent the formation of secondary structures in RNA molecules, thus facilitating translation at low temperature notes: Verified against the public Crossref abstract; CspA-family RNA chaperoning facilitates low-temperature translation. - subject: low_temperature_translation predicate: confers predicate_id: METPO:2007700 object: cold_shock_response_trait description: Preservation of translation realizes the RNA-adaptation branch of the cold-shock-response trait. evidence: - reference: DOI:10.1046/j.1365-2958.1999.01541.x snippet: proposed function as an RNA chaperone to prevent the formation of secondary structures in RNA molecules, thus facilitating translation at low temperature notes: Verified against the public Crossref abstract; RNA chaperoning connects CspA-family proteins to preserved translation during cold stress. discussions: - discussion_id: cold-shock-response-xref-gap prompt: Resolve exact ontology xrefs for organism-level microbial cold shock response before adding TraitRecord xrefs. kind: CURATION_TODO status: OPEN rationale: GO:0009409 response to cold can ground broad biological-process response nodes but is broader than the rapid temperature-downshift cold-shock response curated here. Cold-shock-domain signatures and CspA-family terms describe narrower molecular machinery rather than the whole organism-level stress-response trait. posed_by: codex posed_date: '2026-09-15' curation_history: - timestamp: '2026-09-15T05:32:00Z' curator: codex action: MINTED_TRAITMECH_ID changes: Minted cold shock response as a DOI-backed stress-response TraitRecord after a repository-wide duplicate review covering ignored and hidden files; the local METPO snapshot has only an obsolete cold shock response class and the replacement placeholder is reserved in proposals/metpo_traitmech_v83. llm_assisted: true