A hypothalamic activator of calmodulin-dependent enzymes is thymosin beta 4 (1-39).
Galoyan. A A AA; Shuvalova. L A LA; Davis. M T MT; Shively. J E JE; Lee. T D TD
Key Findings
- Thymosin beta‑4 (1‑39) is a high‑affinity, calcium‑independent activator of MLCK
- Thymosin alpha‑1 also activates MLCK but is less potent
- The potency order is C3 (beta‑4 1‑39) > beta‑4 16‑38 > calcium‑calmodulin > alpha‑1
Practical Outcomes
- While the data suggest beta‑4 could influence muscle contractility or metabolism, there’s no human dosing or safety info, so biohackers can’t directly apply it yet. It mainly confirms beta‑4’s stronger enzyme‑activating effect compared to alpha‑1.
Summary
The study found that a fragment of thymosin beta‑4 (amino acids 1‑39) strongly boosts the baseline activity of a muscle‑related enzyme (MLCK) more than thymosin alpha‑1, but the work was done in test‑tube experiments on rabbit muscle, not in people.
Abstract
A new class of stimulators of basal activity of a number of calmodulin-dependent enzymes have been previously isolated from bovine hypothalamus. One of these stimulators, denoted as C3, has been purified to homogeneity by reverse phase HPLC and tentatively identified as thymosin beta 4 (1-39) by mass spectrometry and Edman microsequence analysis. The stimulating effect of C3 on rabbit skeletal muscle MLCK basal activity was compared with that of thymosin alpha 1 and thymosin beta 4 (16-38). Evidence is presented that all the indicated compounds are Ca(2+)-independent high-affinity MLCK stimulators. The potency of the stimulators in activating the enzyme was: C3 greater than beta 4 greater than (CaM+Ca2+) greater than alpha 1.
Study Information
pubmed
1992
10.1007/bf00969011