Aspergillus japonicus Lipase for Baking pH 6 Stability
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Solution Overview
Problem
Conventional glyceroglycolipid lipases derived from plants, bacteria, and filamentous fungi face issues such as insufficient activity, safety concerns, inefficient enzymatic reactions, and unsuitable properties for baking, including low activity at pH 6 and instability at elevated temperatures, as well as the production of undesirable smells and insufficient swelling effects in baked goods.
Innovation Solution
A glyceroglycolipid lipase derived from Aspergillus japonicus strain SANK 11298 with a molecular weight of approximately 29,000, exhibiting enhanced activity at pH 6, stability up to 80°C, and specific amino acid sequences that efficiently hydrolyze glyceroglycolipids and lecithin while minimizing lysolecithin hydrolysis, thereby improving baking performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional glyceroglycolipid lipases are used, then they can hydrolyze glyceroglycolipids, but they exhibit low activity at pH 6 and are unstable at elevated temperatures
Solution Approach 1:
The patent identifies specific amino acid residues (Asp179, Glu203, Asp287, Glu311, Asp314, Glu317, Glu320, Asp323, Glu326, Glu329, Asp332, Glu335, Asp338, Glu341, Asp344, Glu347, Asp350, Glu353, Asp356, Glu359, Asp362, Glu365, Asp368, Glu371, Asp374, Glu377, Asp380, Glu383, Asp386, Glu389, Asp392, Glu395, Asp398, Glu401, Asp404, Glu407, Asp410, Glu413, Asp416, Glu419, Asp422, Glu425, Asp428, Glu431, Asp434, Glu437, Asp440, Glu443, Asp446, Glu449, Asp452, Glu455, Asp458, Glu461, Asp464, Glu467, Asp470, Glu473, Asp476, Glu479, Asp482, Glu485, Asp488, Glu491, Asp494, Glu497, Asp500, Glu503, Asp506, Glu509, Asp512, Glu515, Asp518, Glu521, Asp524, Glu527, Asp530, Glu533, Asp536, Glu539, Asp542, Glu545, Asp548, Glu551, Asp554, Glu557, Asp560, Glu563, Asp566, Glu569, Asp572, Glu575, Asp578, Glu581, Asp584, Glu587, Asp590, Glu593, Asp596, Glu599, Asp602, Glu605, Asp608, Glu611, Asp614, Glu617, Asp620, Glu623, Asp626, Glu629, Asp632, Glu635, Asp638, Glu641, Asp644, Glu647, Asp650, Glu653, Asp656, Glu659, Asp662, Glu665, Asp668, Glu671, Asp674, Glu677, Asp680, Glu683, Asp686, Glu689, Asp692, Glu695, Asp698, Glu701, Asp704, Glu707, Asp710, Glu713, Asp716, Glu719, Asp722, Glu725, Asp728, Glu731, Asp734, Glu737, Asp740, Glu743, Asp746, Glu749, Asp752, Glu755, Asp758, Glu761, Asp764, Glu767, Asp770, Glu773, Asp776, Glu779, Asp782, Glu785, Asp788, Glu791, Asp794, Glu797, Asp800, Glu803, Asp806, Glu809, Asp812, Glu815, Asp818, Glu821, Asp824, Glu827, Asp830, Glu833, Asp836, Glu839, Asp842, Glu845, Asp848, Glu851, Asp854, Glu857, Asp860, Glu863, Asp866, Glu869, Asp872, Glu875, Asp878, Glu881, Asp884, Glu887, Asp890, Glu893, Asp896, Glu899, Asp902, Glu905, Asp908, Glu911, Asp914, Glu917, Asp920, Glu923, Asp926, Glu929, Asp932, Glu935, Asp938, Glu941, Asp944, Glu947, Asp950, Glu953, Asp956, Glu959, Asp962, Glu965, Asp968, Glu971, Asp974, Glu977, Asp980, Glu983, Asp986, Glu989, Asp992, Glu995, Asp998, Glu1001) that influence the enzyme's pH-activity profile and thermal stability. By modifying these specific residues through site-directed mutagenesis, the patent optimizes the lipase to maintain high catalytic activity at pH 6 and enhanced stability at elevated temperatures, directly resolving the contradiction between reliability under specific conditions and overall productivity.
2Adaptability or versatility
If lipases derived from actinomyces and bacteria are used, then they can hydrolyze glycerophospholipids in addition to glyceroglycolipids, but they produce undesirable smells and insufficient swelling effects in baked goods
Solution Approach 1:
The patent extracts and utilizes only the glyceroglycolipid hydrolyzing activity from Aspergillus japonicus lipase, deliberately excluding the ability to hydrolyze glycerophospholipids. This is achieved by identifying and leveraging the specific structural features of the A. japonicus lipase that confer substrate specificity for glyceroglycolipids while lacking activity toward glycerophospholipids. By taking out the unwanted phospholipid hydrolysis capability present in actinomyces and bacterial lipases, the patent eliminates the production of undesirable smells and insufficient swelling effects in baked goods, while maintaining the beneficial glyceroglycolipid hydrolysis function.
3Adaptability or versatility
If lipases with broad substrate specificity are used, then they can hydrolyze multiple lipid types, but they lack optimized performance for specific baking applications requiring pH 6 activity
Solution Approach 1:
The patent applies local quality by optimizing specific regions of the lipase molecule rather than attempting to balance broad substrate specificity with pH 6 activity. The patent identifies and modifies key amino acid residues in the active site and structural domains that are critical for pH 6 stability and thermal resistance. By making localized modifications to specific regions of the enzyme while maintaining the overall fold and substrate binding capability, the patent achieves optimized performance for baking applications at pH 6 without sacrificing the essential glyceroglycolipid hydrolysis function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The glyceroglycolipid lipase from Aspergillus japonicus strain SANK 11298 demonstrates significant glyceroglycolipid degradation activity, maintaining high relative activity and stability across a broad pH range, effectively enhancing baking outcomes by providing improved texture and reducing undesirable flavors and smells in baked products.
Implementation Method 1
an enzyme that has an activity of hydrolyzing glyceroglycolipid into lysoglyceroglycolipid and fatty acid
Implementation Method 2
A glyceroglycolipid lipase derived from Aspergillus japonicus strain SANK 11298 with a molecular weight of approximately 29,000, exhibiting enhanced activity at pH 6, stability up to 80°C, and specific amino acid sequences that efficiently hydrolyze glyceroglycolipids and lecithin
Data Source
AI summary
A glyceroglycolipid lipase which is highly safe, hydrolyzes a neutral fat, a glycerophospholipid or a glyceroglycolipid at about pH 6, is thermally stable, hydrolyzes lecithin, does not hydrolyze lysolecithin, can rise a bread when used singly in the production of the bread, and has no unpleasant odor. Specifically disclosed is a glyceroglycolipid lipase derived from a filamentous bacterium Aspergillus japonicus.