STRADA Human

STE20-Related Kinase Adaptor Alpha Human Recombinant
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Description

Introduction to STRADA Human

STRADA (STE20 Related Adaptor Alpha) is a protein-coding gene located on chromosome 17q23.3, encoding a pseudokinase critical for regulating the mechanistic target of rapamycin (mTOR) signaling pathway . This gene plays a pivotal role in neurodevelopment, cellular metabolism, and cell cycle control. Mutations in STRADA are linked to neurodevelopmental disorders, including Polyhydramnios, Megalencephaly, and Symptomatic Epilepsy (PMSE) syndrome, characterized by brain overgrowth, intractable seizures, and intellectual disability .

Molecular Structure and Function

STRADA functions as a pseudokinase, lacking catalytic activity but retaining structural features of the STE20 kinase family. It forms a heterotrimeric complex with:

  • Serine/threonine kinase 11 (STK11/LKB1)

  • Calcium-binding protein 39 (CAB39/MO25)

This complex activates STK11, promoting its cytoplasmic localization and enabling phosphorylation of downstream targets like AMP-activated protein kinase (AMPK) . STRADA is essential for STK11-mediated G1 cell cycle arrest and regulates mTORC1 signaling, which governs cell growth, proliferation, and autophagy .

Key Disorders Linked to STRADA Mutations:

  • PMSE Syndrome: Autosomal recessive mutations (e.g., exon 9–13 deletions) cause megalencephaly, cortical malformations, and epilepsy .

  • Benign Epilepsy With Centrotemporal Spikes: Rare cases linked to STRADA variants .

  • Infantile Spasms: Compound heterozygous mutations (e.g., c.1134G>A, c.226G>A) reported in patients with heterotopia and polymicrogyria .

Table 1: Pathogenic STRADA Genetic Variants

Variant IDNucleotide ChangeProtein ChangeAssociated PhenotypePopulationReference
PS-MennoniteExon 9–13 deletionFrameshiftPMSE SyndromeOld Order Mennonite
STRADA_0001c.1134G>Ap.Arg395HisInfantile Spasms, HeterotopiaNon-Mennonite
STRADA_0002c.226G>Ap.Gly765SerInfantile Spasms, PolymicrogyriaNon-Mennonite

Role in mTOR Signaling Pathway

STRADA modulates mTORC1 activity through the LKB1-AMPK-TSC1/2 axis:

  1. STRADA-LKB1-MO25 Complex: Activates LKB1, which phosphorylates AMPK .

  2. AMPK Activation: Inhibits mTORC1 via TSC1/TSC2, reducing cell growth .

  3. Pathogenic Consequences: Loss of STRADA disrupts this pathway, causing mTORC1 hyperactivation, neuronal hypertrophy, and cortical dysplasia .

Table 2: Key Findings from STRADA-Deficient Models

Model SystemKey FindingsImplicationsReference
CRISPR-edited N2a cellsIncreased mTOR signaling, enlarged cell sizeConfirmed mTOR dysregulation
Germline Strada KO micePerinatal lethality, hypotonia, ventriculomegaly, ectopic white matter neuronsMirrors human PMSE neuropathology
iPSC-derived neuronsDepolarized resting potential, reduced action potential thresholdAltered neuronal excitability
Cortical organoids (hCO)Enlarged organoids, delayed neurogenesis, increased outer radial gliaLinks mTOR to cortical expansion

Therapeutic Approaches and Pharmacological Insights

  • Rapamycin (mTORC1 inhibitor): Reduces seizure frequency in PMSE patients but does not improve cognitive deficits .

  • Wnt Pathway Inhibition: Rescues neural rosette overgrowth in STRADA-mutant organoids .

Genetic Variants and Population Studies

STRADA mutations exhibit founder effects in Old Order Mennonite communities but are also reported in non-Mennonite populations (e.g., Turkish and Asian pedigrees) . Genetic screening in epilepsy cohorts reveals compound heterozygous variants, expanding the phenotypic spectrum .

Product Specs

Introduction
STE20-Related Kinase Adaptor Alpha (STRADA) belongs to the STE-20 like kinase family, which activates MAPK pathways by activating MAPKKK. STRADA acts as an upstream activator of LKB1 and regulates its sub-cellular localization by anchoring it in the cytoplasm. The interaction between STRADA and LKB1 results in the phosphorylation of STRADA and enhances the autophosphorylation of LKB1.
Description
Recombinant human STRADA, expressed in E. coli, is a single, non-glycosylated polypeptide chain. It encompasses amino acids 1-314 and has a molecular weight of 37 kDa. The protein includes a 23 amino acid His-tag at the N-terminus and is purified using proprietary chromatographic techniques.
Physical Appearance
Colorless, sterile-filtered solution.
Formulation
The STRADA protein solution has a concentration of 1 mg/ml and is supplied in a buffer containing 20 mM Tris-HCl (pH 8.0), 0.4 M Urea, and 10% glycerol.
Stability
For short-term storage (up to 2-4 weeks), the product can be stored at 4°C. For extended storage, it is recommended to freeze the product at -20°C. To ensure long-term stability, adding a carrier protein (0.1% HSA or BSA) is recommended. Avoid repeated freeze-thaw cycles.
Purity
The purity of the protein is greater than 85%, as determined by SDS-PAGE analysis.
Synonyms
LYK5, NY-BR-96, PMSE, Stlk, STRAD, STE20-related kinase adapter protein alpha, STRAD alpha, STE20-related adapter protein, Serologically defined breast cancer antigen NY-BR-96, STRADA.
Source
Escherichia Coli.
Amino Acid Sequence
MGSSHHHHHH SSGLVPRGSH MGSMSFLVSK PERIRTNDAS SESIASFSKQ EVMSSFLPEG GCYELLTVIG KGFEDLMTVN LARYKPTGEY VTVRRINLEA CSNEMVTFLQ GELHVSKLFN HPNIVPYRAT FIADNELWVV TSFMAYGSAK DLICTHFMDG MNELAIAYIL QGVLKALDYI HHMGYVHRSV KASHILISVD GKVYLSGLRS NLSMISHGQR QRVVHDFPKY SVKVLPWLSP EVLQQNLQGY DAKSDIYSVG ITACELANGH VPFKDMPATQ MLLEKLNGTV PCLLDTSTIP AEELTMSPSR SVANSGLSDS LTTSTPRPSN GPVPAPS.

Q&A

What defines human-centered research in education-to-employment pathways?

Human-centered research in education-to-employment contexts prioritizes understanding both learner needs and employer requirements as fundamental to creating equitable pathways. This approach moves beyond traditional outcome measures to incorporate lived experiences and perspectives of participants. Methodologically, it combines qualitative methods such as in-depth interviews and ethnographic techniques with quantitative analyses to develop action-oriented insights. The approach requires researchers to position subjects as active participants rather than passive objects of study, creating feedback loops that inform research direction and application. Strada's research framework exemplifies this approach by focusing on five dimensions: career coaching, data systems, employer engagement, affordability, and future-oriented workforce development .

How should researchers structure within-subjects designs for education pathway studies?

When structuring within-subjects designs for education pathway research, researchers should establish baseline measurements before any intervention or manipulation of the independent variable. This approach is particularly valuable when studying educational interventions because participants serve as their own control group, reducing variation due to individual differences. Researchers must carefully sequence measurements to prevent learning effects or carryover bias, typically implementing washout periods between conditions. When studying educational or career interventions, consider using counterbalancing techniques where half the participants experience condition A first, then B, while the other half experience B then A. This design is especially effective when measuring changes in career readiness or skill development where individual variations might otherwise mask intervention effects .

What basic ethical considerations must be addressed when conducting research with educational stakeholders?

When conducting research with educational stakeholders, researchers must adhere to several fundamental ethical principles. Informed consent processes should clearly communicate study purposes, methods, and potential risks while avoiding technical jargon. Maintaining confidentiality of participant data, particularly when working with vulnerable populations such as students, requires secure data management systems and proper anonymization protocols. Researchers must also be attentive to power dynamics, particularly when working across educational institutions and employer organizations where hierarchical relationships may influence participation or responses. Any research design should incorporate mechanisms for participants to withdraw without consequences and provide clear information about how their data will be used in publications or policy recommendations .

How can researchers effectively isolate independent variables when studying education-to-employment outcomes?

Isolating independent variables in education-to-employment research requires careful experimental design that controls for confounding factors. Researchers should implement one of several methodological approaches: (1) Random assignment to experimental conditions when possible, which helps distribute unknown confounding variables equally across groups; (2) Statistical controls through multivariate analysis techniques that account for variables like socioeconomic background, prior educational attainment, and geographic factors; (3) Matched comparison groups that pair participants with similar characteristics except for the variable being studied; or (4) Fixed effects models that control for unobserved stable characteristics. When studying workforce transition outcomes, researchers must be particularly attentive to labor market conditions, industry-specific trends, and regional economic factors that might influence employment outcomes independent of educational interventions .

What methodological approaches best address data contradictions in longitudinal education pathway studies?

When addressing data contradictions in longitudinal education pathway studies, researchers should employ a systematic methodology for resolution and analysis. First, implement data triangulation by comparing contradictory findings across multiple data sources to identify patterns of consistency and divergence. Second, conduct timeline analysis to determine whether contradictions represent actual changes over time rather than methodological errors. Third, perform subgroup analysis to examine whether contradictions reflect meaningful differences between population segments rather than general inconsistencies. Fourth, employ mixed-methods validation where qualitative interviews help explain quantitative contradictions. Finally, researchers should apply sensitivity analysis to determine how robust findings are to different analytical approaches. The ultimate goal is not simply to resolve contradictions but to understand what these contradictions reveal about the complex relationship between educational experiences and career outcomes .

How should researchers design experiments that account for employer-education provider alignment variables?

Designing experiments that measure employer-education alignment requires multi-level research designs that capture both institutional and individual-level variables. Researchers should implement the following methodological approach: (1) Define clear metrics for alignment such as curriculum relevance, skill-matching indices, and time-to-productivity measures; (2) Establish baseline measurements for both education providers and employers before testing interventions; (3) Develop experiments that manipulate specific aspects of alignment (such as information sharing, co-development of curricula, or feedback mechanisms) while holding other variables constant; (4) Measure outcomes at multiple time points to capture both immediate and delayed effects of alignment interventions; and (5) Incorporate control groups from similar industry-education pairings where no intervention occurs. This approach allows researchers to isolate the specific mechanisms through which alignment impacts student outcomes while controlling for external factors like labor market conditions or industry-specific trends .

What statistical approaches are most effective for analyzing complex education-to-employment pathway data?

The analysis of complex education-to-employment pathway data requires sophisticated statistical approaches that capture multi-dimensional relationships. Recommended methodologies include: (1) Structural equation modeling to test theoretical pathways between educational experiences and employment outcomes while accounting for mediating variables; (2) Multilevel modeling that accounts for nested data structures (students within institutions within regions); (3) Propensity score matching to create quasi-experimental comparisons when randomization is not possible; (4) Sequence analysis techniques that identify common patterns in non-linear educational and career trajectories; and (5) Machine learning approaches for identifying previously unrecognized patterns in large datasets. These advanced statistical methods should be complemented by careful data visualization techniques that communicate complex relationships to stakeholders. When implemented correctly, these approaches allow researchers to move beyond simplistic correlations to understand the causal mechanisms that connect educational interventions to career outcomes .

How can researchers effectively integrate qualitative and quantitative methods in within-subjects research designs?

Effective integration of qualitative and quantitative methods in within-subjects research designs requires careful methodological planning and execution. Researchers should implement a sequential design where quantitative measurements (such as skills assessments or employment outcomes) are collected at baseline and post-intervention, while qualitative data collection occurs between these measurement points to document the participant's experience and process of change. This approach allows researchers to not just measure whether change occurred, but understand how and why it developed. Analytical integration should include: (1) Coding qualitative data to identify mechanisms of change; (2) Connecting individual narratives to quantitative outcomes through case-oriented analysis; (3) Using qualitative findings to generate hypotheses about divergent quantitative results; and (4) Developing integrated displays that present both types of data together. This methodological approach is particularly valuable when studying complex educational interventions where participant experiences significantly influence outcomes .

What methodological approaches best evaluate the efficacy of work-based learning programs across diverse populations?

Evaluating work-based learning programs across diverse populations requires methodologically robust approaches that account for contextual variables and population differences. Researchers should implement: (1) Comparative case study designs with carefully matched program sites that allow for cross-context analysis; (2) Difference-in-differences analysis comparing outcomes before and after program implementation across different population groups; (3) Mixed-methods assessment protocols that combine standardized outcome measures with contextualized qualitative evaluation; (4) Longitudinal tracking systems that follow participants beyond program completion to measure sustained effects; and (5) Participatory evaluation components where program participants contribute to assessment design and interpretation. These approaches should be designed to disaggregate data by relevant demographic factors while maintaining sufficient statistical power. The analysis should specifically examine interaction effects between program elements and population characteristics to identify which program components are universally effective and which require contextual adaptation .

What methodological considerations apply when designing data systems for tracking education-to-employment outcomes?

When designing data systems for tracking education-to-employment outcomes, researchers must address several methodological considerations to ensure validity and utility. First, implement unique identifier systems that allow for secure, privacy-compliant tracking across institutional boundaries while preventing duplicate records. Second, develop standardized outcome metrics with clear operational definitions that maintain consistency across diverse educational and employment contexts. Third, establish data governance frameworks that address ownership, access permissions, and usage protocols across multiple stakeholders. Fourth, design flexible taxonomies for classifying educational experiences and employment outcomes that can evolve with changing workforce requirements. Finally, implement systematic data quality protocols including validation checks, missing data procedures, and documentation of collection methodologies. These data systems should be designed not just for retrospective analysis but to support real-time decision-making by educational institutions, policymakers, and individual learners navigating education-to-employment pathways .

What methodological safeguards should be implemented when conducting longitudinal research on vulnerable student populations?

Longitudinal research with vulnerable student populations requires robust methodological safeguards that extend beyond standard ethical protocols. Researchers should implement: (1) Ongoing consent procedures where participants reaffirm their willingness to continue at each data collection point rather than relying on initial consent only; (2) Graduated incentive structures that compensate participants fairly without creating coercive pressure; (3) Trauma-informed data collection protocols that minimize risk of retraumatization when discussing educational or employment challenges; (4) Community advisory boards that include representatives from the study population to provide guidance on ethical concerns; and (5) Data security protocols that exceed minimum requirements when handling sensitive information about vulnerable participants. Additionally, researchers should develop clear protocols for addressing concerning disclosures (such as evidence of discrimination or abuse) that balance confidentiality with appropriate intervention. These safeguards should be implemented as methodological components rather than administrative add-ons, informing every aspect of research design and execution .

How can researchers effectively measure the alignment between educational outcomes and employer needs while maintaining methodological rigor?

Measuring alignment between educational outcomes and employer needs requires methodologically sound approaches that go beyond simple surveying. Researchers should implement: (1) Skills taxonomy development using both inductive and deductive approaches to create shared language between education and employment sectors; (2) Multi-method skills assessment that combines direct measurement, self-reporting, and employer evaluation; (3) Comparative analysis of curriculum artifacts against job requirement documentation using standardized coding frameworks; (4) Time-series analysis that tracks changes in alignment over time relative to labor market evolution; and (5) Value-added modeling that isolates the contribution of specific educational components to workplace preparation. These approaches should be implemented with careful attention to validity threats such as self-report bias, selection effects, and market-specific variations. When designed properly, these methodologies provide actionable insights for both education providers seeking to improve outcomes and employers looking to develop more effective talent pipelines .

Product Science Overview

Structure and Function

STRADA consists almost entirely of an STE20-like kinase domain but lacks several residues essential for intrinsic catalytic activity, classifying it as a pseudokinase . Despite its lack of catalytic activity, STRADA forms a heterotrimeric complex with serine/threonine kinase 11 (STK11, also known as LKB1) and the scaffolding protein calcium-binding protein 39 (CAB39, also known as MO25) . This complex is essential for the activation of STK11, leading to the phosphorylation of both proteins and excluding STK11 from the nucleus .

Biological Role

The primary function of STRADA is to act as a pseudosubstrate for STK11/LKB1, promoting its conformational change into an active state . This activation is crucial for STK11-induced G1 cell cycle arrest, which is a vital process in preventing uncontrolled cell proliferation . Additionally, STRADA is involved in several signaling pathways, including the mTOR signaling and PI3K-Akt signaling pathways, which are critical for cell growth, survival, and metabolism .

Clinical Significance

Mutations in the STRADA gene have been associated with Polyhydramnios, Megalencephaly, and Symptomatic Epilepsy (PMSE) syndrome . This rare genetic disorder is characterized by an excess of amniotic fluid during pregnancy, an abnormally large brain, and recurrent seizures . Understanding the role of STRADA in these conditions can provide insights into potential therapeutic targets for treating such disorders.

Research and Applications

Recombinant STRADA proteins are widely used in research to study their role in cellular processes and disease mechanisms. These studies help in elucidating the molecular pathways involving STRADA and identifying potential drug targets for related diseases .

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